Technology Information Law Blog by Charles Gideon Korrell

Tag: claim construction

  • Sierra Wireless v. Sisvel: (Dis)Qualification of Expert Witnesses in the PTAB

    Sierra Wireless v. Sisvel: (Dis)Qualification of Expert Witnesses in the PTAB

    In its March 10, 2025 decision in Sierra Wireless, ULC v. Sisvel S.p.A., the Federal Circuit vacated a Patent Trial and Appeal Board (PTAB) decision due, in part, to the improper reliance on an expert witness who was not shown to possess the qualifications of a person of ordinary skill in the art (POSITA). For patent litigators and practitioners navigating IPR proceedings, the court’s analysis serves as a reminder of the evidentiary standards governing expert testimony.

    Background

    Sisvel’s U.S. Patent No. 7,869,396 covers an ARQ method in wireless communications. The appellants—Sierra Wireless, Honeywell, and Telit Cinterion—challenged all claims in IPR, asserting anticipation and obviousness based on a prior international application (“Sachs”).

    The PTAB held the independent claims (1, 2, and 6–8) unpatentable but upheld the dependent claims (3–5, 9, 10). Both parties appealed. On appeal, the Federal Circuit took particular issue with how the Board assessed expert testimony from Sisvel’s declarant, Regis Bates.

    Expert Qualifications: The Core of the Dispute

    Appellants argued the PTAB improperly relied on Bates’ declarations despite his failure to meet the Board’s own definition of a POSITA. Specifically, the Board had defined a POSITA as someone with:

    • A degree in electrical engineering or a similar discipline, and
    • At least three years of relevant industry or research experience in wireless radio systems for data transmission and retransmission.

    Bates lacked a technical degree and had no clear experience designing transmission/retransmission methods in cellular networks. Nonetheless, his testimony was repeatedly cited by the Board in support of its obviousness and anticipation findings.

    The Federal Circuit agreed with the appellants, citing Kyocera Senco Indus. Tools Inc. v. ITC, 22 F.4th 1369 (Fed. Cir. 2022), to reaffirm that a witness must possess at least the ordinary skill in the art to opine on claim construction, anticipation, and obviousness. The Board’s reliance on Bates, without addressing whether his decades of telecommunications experience could substitute for formal qualifications, was deemed an abuse of discretion.

    Practical Takeaways

    • POSITA matters: A witness’s qualifications must align with the Board’s (or court’s) definition of a skilled artisan. Practitioners should be prepared to establish this alignment explicitly—especially in PTAB proceedings, where the evidentiary record is often limited to declarations and cross-examination.
    • Challenge early and clearly: Raise challenges to expert qualifications as early as possible. In this case, the issue was preserved and ultimately reversed a PTAB finding.
    • Substance over longevity: Even decades of experience in a general field may not suffice if it doesn’t map to the specific technical area required under the POSITA standard.

    Final Thoughts

    As patent practitioners continue to leverage expert declarations in IPRs and litigation, Sierra Wireless underscores the importance of tightly linking an expert’s credentials to the POSITA definition. Courts will not hesitate to vacate Board decisions that rest on testimony from unqualified experts—regardless of the expert’s experience or the PTAB’s apparent confidence.

    By Charles Gideon Korrell

  • Federal Circuit Revives Patent Infringement Case Over Quick-Release Tactical Vest System

    In a recent decision, the United States Court of Appeals for the Federal Circuit vacated a district court’s summary judgment ruling of noninfringement in IQRIS Technologies LLC v. Point Blank Enterprises, Inc., and National Molding, Inc. The ruling focuses on a dispute over the proper interpretation of the term “pull cord” in IQRIS Technologies’ patents for quick-release systems used in tactical vests. The decision addresses key issues in patent law, including claim construction, literal infringement, and the doctrine of equivalents.

    Background of the Case

    IQRIS Technologies LLC (“IQRIS”) sued Point Blank Enterprises and National Molding (collectively, “Defendants”) for allegedly infringing U.S. Patent Nos. 7,814,567 and 8,256,020. These patents cover quick-release mechanisms for tactical vests, designed to allow soldiers and first responders to rapidly remove their vests in emergency situations. The accused products, Point Blank’s tactical vests using National Molding’s “Quad Release” and “Evil Twin” quick-release systems, were alleged to infringe on these patents.

    Defendants moved for summary judgment, arguing that their products did not infringe because they lacked a “pull cord” as required by the claims. The district court agreed, construing the term “pull cord” to mean a “cord that can be directly pulled by a user to disengage a releasable fastener or hook.” Because Defendants’ products used Bowden cables—flexible, sheathed cables actuated by a trigger—the district court held they did not meet the patent claim requirements and granted summary judgment of noninfringement.

    Issues of Law Addressed by the Court

    1. Claim Construction – What Constitutes a “Pull Cord”?

    One of the most critical aspects of the case was the interpretation of the term “pull cord.” The district court had narrowly construed “pull cord” as requiring direct pulling by the user, excluding designs incorporating triggers or handles. The Federal Circuit, however, found this construction too restrictive, emphasizing that the patent claims did not explicitly require direct pulling and that nothing in the specification clearly disavowed the inclusion of a handle or intermediary mechanism.

    This ruling aligns with longstanding Federal Circuit precedent cautioning against importing limitations from preferred embodiments into the claims unless the patentee has expressly redefined the term or disavowed broader interpretations. By overturning the district court’s construction, the Federal Circuit ensured that IQRIS could argue that the accused products’ mechanisms fell within the scope of the asserted patent claims.

    2. Literal Infringement and the Doctrine of Equivalents

    Given its narrow construction of “pull cord,” the district court concluded that the accused products did not literally infringe because their Bowden cable system was indirectly actuated by a trigger rather than being directly pulled. It also found no infringement under the doctrine of equivalents, reasoning that the accused system provided a “mechanical advantage” over the claimed invention and that a finding of equivalency would ensnare prior art.

    The Federal Circuit disagreed, ruling that the lower court’s reasoning improperly relied on an overly restrictive claim interpretation. The appellate court emphasized that while prior art considerations are relevant to the doctrine of equivalents, the patent specification did not criticize handles per se, only the tedious reassembly process associated with certain prior art systems. Because the district court’s ruling was based on an erroneous claim construction, the Federal Circuit vacated the summary judgment and remanded the case for further proceedings.

    Implications for Patent Law and Intellectual Property

    This case highlights several important principles in patent law:

    • Claim Scope and Construction: Courts must be careful not to limit claim terms to specific embodiments unless there is a clear disavowal or redefinition in the specification.
    • Doctrine of Equivalents: When determining infringement under the doctrine of equivalents, courts must avoid improperly excluding systems that achieve substantially the same function, in the same way, to achieve the same result.
    • Impact on Future Litigation: The decision underscores the importance of precise claim drafting and the risks associated with overly narrow claim constructions. Patent owners must ensure their claims are drafted broadly enough to cover alternative implementations while avoiding prior art limitations.

    Conclusion

    The Federal Circuit’s ruling revives IQRIS’s infringement claims and provides an opportunity for further fact-finding on remand. This case serves as a reminder that claim construction disputes can significantly impact infringement determinations and that patentees should carefully define their terms to avoid unnecessary limitations on claim scope. As the case returns to the district court, the parties will now litigate under a broader interpretation of “pull cord,” which could ultimately affect the outcome on infringement and potential damages.

    Patent litigants should take note of this decision, as it reinforces the importance of claim language and how courts interpret key patent terms in infringement disputes.

    By Charles Gideon Korrell

  • Court of Appeals Decision in Lashify, Inc. v. International Trade Commission: Key Takeaways

    On March 5, 2025, the United States Court of Appeals for the Federal Circuit issued a decision in Lashify, Inc. v. International Trade Commission, a case concerning intellectual property rights in the context of international trade and the domestic industry requirement under Section 337 of the Tariff Act of 1930. The ruling has significant implications for patent enforcement at the U.S. International Trade Commission (ITC) and the interpretation of what constitutes a “domestic industry.”

    Background of the Case

    Lashify, Inc., a U.S.-based company, filed a complaint with the ITC alleging that several importers were violating Section 337 by importing and selling artificial eyelash extension products that infringed its patents. The patents at issue included:

    • U.S. Patent No. 10,721,984 (a utility patent related to lash extensions and their application process), and
    • U.S. Design Patent Nos. D877,416 and D867,664 (design patents covering a lash applicator and storage cartridge).

    To succeed under Section 337, Lashify had to demonstrate both patent infringement and the existence of a domestic industry relating to the patented products. The ITC ruled against Lashify, finding that it failed to satisfy the “economic prong” of the domestic industry requirement and that its own products did not practice the claimed invention of the ’984 patent.

    Key Legal Issues Addressed

    1. Domestic Industry Requirement Under Section 337

    One of the central legal issues was the interpretation of the “economic prong” of the domestic industry requirement under Section 337(a)(3), which requires a complainant to show:

    • (A) Significant investment in plant and equipment;
    • (B) Significant employment of labor or capital; or
    • (C) Substantial investment in the exploitation of the patent, including engineering, research and development, or licensing.

    The ITC found that Lashify’s domestic activities—sales, marketing, warehousing, quality control, and distribution—did not qualify as “significant employment of labor or capital” under subsection (B). The Federal Circuit rejected this interpretation, ruling that the ITC had applied an overly restrictive reading of the statute. The court held that Section 337 does not categorically exclude expenditures on sales, marketing, warehousing, quality control, and distribution. Instead, it directed the ITC to reassess Lashify’s expenditures under the correct legal framework.

    2. Claim Construction and the “Heat Fused” Limitation

    Another key issue was whether Lashify’s own lash extension products met the “heat fused” requirement in its ’984 patent. The ITC had determined that Lashify’s products did not satisfy the technical prong of the domestic industry test because they did not form a “single entity” as required by the claim construction.

    Lashify challenged this finding, arguing that “heat fused” should be interpreted more broadly. The Federal Circuit upheld the ITC’s construction, emphasizing that the claim language and specification supported the requirement that the fused fibers form a “single entity,” excluding methods that merely use glue as a binding agent. This ruling underscores the importance of precise claim drafting in patent applications and litigation.

    Implications for Intellectual Property Law

    This decision has several notable implications:

    1. Expanded Scope of Domestic Industry: The ruling clarifies that non-manufacturing activities, such as warehousing and marketing, can contribute to a domestic industry analysis under Section 337. This makes it easier for companies that primarily engage in sales and distribution to seek ITC protection against infringing imports.
    2. Stricter Standards for Proving Patent Practice: The court’s affirmation of the ITC’s claim construction reinforces the importance of clear patent drafting and claim scope. Patent holders must ensure that their claims are not so narrowly construed that their own products fail to qualify.
    3. Stronger ITC Jurisdiction Over Design Patents: Since the Federal Circuit vacated the ITC’s decision regarding the economic prong for the design patents, the case may lead to stronger ITC enforcement of design patents, which are often easier to enforce than utility patents due to their lack of technical-prong requirements.

    Conclusion

    The Lashify, Inc. v. ITC decision is a pivotal case in ITC intellectual property enforcement. It reinforces a broader interpretation of the domestic industry requirement, making it more accessible for U.S.-based companies relying on intellectual property protection. At the same time, it highlights the critical importance of robust patent claim drafting and the need to ensure that a company’s own products meet the claimed invention’s requirements. As the case heads back to the ITC on remand, the industry will be watching closely to see how these legal principles are applied in practice.

    By Charles Gideon Korrell

  • Federal Circuit Upholds Patentability of Stem Cell Technology in Restem v. Jadi Cell

    The United States Court of Appeals for the Federal Circuit recently issued a significant ruling in Restem, LLC v. Jadi Cell, LLC, upholding the validity of Jadi Cell’s U.S. Patent No. 9,803,176. This case, which originated from an inter partes review (IPR) before the Patent Trial and Appeal Board (PTAB), revolved around whether Restem could prove that Jadi Cell’s patent claims were unpatentable due to anticipation or obviousness. The Federal Circuit affirmed the PTAB’s decision, reinforcing critical aspects of intellectual property law, particularly regarding claim construction, inherent anticipation, and obviousness in biotechnology patents.

    Key Legal Issues in the Case

    1. Claim Construction and the Definition of “Isolated Cell”

    One of the central disputes in the case was the proper construction of the term “isolated cell” in Jadi Cell’s patent. Restem argued that an “isolated cell” should be construed as a single cell derived from the subepithelial layer of mammalian umbilical cord tissue. However, the Federal Circuit agreed with the PTAB’s construction that “isolated cell” referred to a cell population, based on how cell marker expression was analyzed in the industry and throughout the patent prosecution history. This interpretation was critical because it influenced how prior art disclosures were evaluated for anticipation and obviousness.

    2. Inherent Anticipation and Prior Art

    Restem challenged the patent on the grounds that prior art (specifically, the Majore reference) inherently anticipated the claimed invention. To establish inherent anticipation, Restem needed to show that following Majore’s process would necessarily and inevitably result in the claimed isolated cells. The court, however, found that the prior art did not disclose the specific cell marker expression profile required by the ‘176 patent. Because cell marker expression can depend on multiple variables, including cell-to-cell interactions and culture conditions, the court concluded that inherency had not been established.

    This ruling reinforces a fundamental principle in patent law: inherency must be more than just a possible or likely result—it must be a guaranteed outcome of the prior art.

    3. Obviousness and the Influence of Culture Media

    Restem also argued that the patent was obvious based on a combination of prior art references, including Kita, Majore, and other secondary references. One of the dependent claims (claim 9) specified that the isolated cells were cultured in media free of animal components. The PTAB ruled that claim 9 was non-obvious for two reasons: (1) Restem failed to prove that the prior art inherently produced the claimed cells, and (2) the record evidence suggested that animal components were commonly used in culture media at the time, making the patented method distinct.

    The Federal Circuit’s decision underscores the importance of demonstrating a clear motivation to combine prior art references and a reasonable expectation of success—both key requirements in proving obviousness.

    Implications for Intellectual Property Law

    This case has several important takeaways for intellectual property practitioners and companies in the biotechnology space:

    1. Claim Scope Matters: How patent claims are constructed and interpreted can make or break a validity challenge. The court’s recognition of “isolated cell” as referring to a population of cells rather than a single cell highlights the importance of precision in drafting patent claims and prosecution history estoppel.
    2. Inherent Anticipation Requires Certainty: Simply arguing that a prior art process might result in the patented invention is not enough. The challenger must show that the patented invention necessarily results from the prior art.
    3. Obviousness Requires Stronger Evidence: In biotechnology patents, particularly those involving complex biological processes, showing that a claimed invention was obvious requires clear evidence of motivation to combine references and a reasonable expectation of success.

    Conclusion

    The Federal Circuit’s ruling in Restem v. Jadi Cell is a crucial win for patent holders in the biotech industry, reaffirming that patents must be carefully analyzed before they are invalidated. The decision reinforces the standards for claim construction, inherency, and obviousness, ensuring that patent rights remain robust where innovation is demonstrated.

    As biotechnology and stem cell research continue to evolve, this case will likely serve as a precedent in future disputes over similar intellectual property rights. Companies and practitioners should take note of the court’s reasoning when drafting patent applications and preparing for potential challenges.

    By Charles Gideon Korrell

  • Federal Circuit Weighs in on Gesture-Based Patent Dispute: Key Takeaways for IP Law

    The Federal Circuit’s recent decision in Apple Inc. v. Gesture Technology Partners, LLC (March 2025) provides important insights into patent law, particularly in the context of inter partes review (IPR) proceedings and obviousness determinations. This ruling builds on the court’s earlier January 2025 decision in another dispute involving Gesture Technology Partners, reinforcing key legal principles regarding patent validity and the scope of IPR challenges.

    Below, we explore the major legal issues addressed in this case, how they connect to the January ruling, and what they mean for the future of intellectual property law in the tech industry.

    Background of the Case

    The dispute centers around U.S. Patent No. 7,933,431 (the ’431 patent), which relates to gesture-based input methods using cameras and optical sensors. Gesture Technology Partners, LLC (Gesture) sued Apple, LG Electronics, and Google for alleged infringement of the ’431 patent. Apple and its co-appellees petitioned for inter partes review (IPR), challenging the patent’s validity based on prior art.

    The Patent Trial and Appeal Board (PTAB) ruled that most claims were unpatentable but upheld claims 11 and 13. Apple appealed this decision, while Gesture cross-appealed, arguing that additional claims should remain valid.

    The Federal Circuit ultimately affirmed the PTAB’s findings, ruling that claims 1–10, 12, and 14–31 were unpatentable, while upholding claims 11 and 13.

    Connection to the January 2025 CAFC Decision

    This decision follows and reinforces the January 2025 ruling in Gesture Technology Partners, LLC v. Unified Patents LLC, another Federal Circuit case involving Gesture’s ’431 patent. In that case:

    • The Federal Circuit affirmed the PTAB’s finding that claims 7–9 and 12 were unpatentable, relying heavily on prior art disclosures in the Numazaki reference.
    • However, the court also upheld the PTAB’s ruling that claims 10, 11, and 13 were not unpatentable, which became a key point of contention in Apple’s subsequent appeal.

    The March 2025 ruling effectively follows the logic of the January 2025 decision, particularly in two major ways:

    1. Reaffirming PTAB’s Findings on Patent Validity:
      • Both cases emphasized that Numazaki disclosed fundamental aspects of gesture-based control, making most of Gesture’s claims obvious under 35 U.S.C. § 103.
      • The Federal Circuit consistently deferred to the PTAB’s factual findings regarding how Numazaki rendered certain claims unpatentable.
    2. Consistently Upholding Claims 11 and 13:
      • The January 2025 case upheld claims 10, 11, and 13, creating a foundation for Apple’s subsequent challenge.
      • In the March 2025 decision, Apple sought to overturn the PTAB’s finding on claims 11 and 13, arguing that the Board misapplied the obviousness standard—but the Federal Circuit again upheld these claims, reinforcing its prior stance.

    Together, these two decisions establish a strong precedent for how courts evaluate IPR outcomes, particularly in disputes involving expired patents and prior art analysis.

    Key Legal Issues Addressed by the Court

    1. Obviousness and Prior Art

    The primary legal issue in both cases was whether the patent claims were invalid due to obviousness under 35 U.S.C. § 103. The court ruled that most of the patent’s claims were obvious in light of prior art—particularly U.S. Patent No. 6,144,366 (Numazaki).

    • Apple argued that Numazaki disclosed similar technology and that a person of ordinary skill in the art would have found the claimed invention obvious.
    • Gesture countered that Numazaki did not sufficiently teach key elements of the ’431 patent, particularly its sensing and image-processing functionalities.

    In both cases, the court upheld the PTAB’s determinations, reaffirming that Numazaki was sufficient prior art to invalidate most claims.

    2. Inter Partes Review (IPR) Estoppel and Standing

    Apple faced a procedural challenge regarding IPR estoppel under 35 U.S.C. § 315(e)(1), which bars petitioners from re-litigating arguments that were (or could have been) raised in an earlier IPR.

    • Gesture argued that Apple should be estopped from challenging claims 11 and 13 because it was allegedly a real party in interest or privy of Unified Patents, the petitioner in the earlier January 2025 case.
    • The court rejected this argument, holding that Gesture had forfeited this claim by not raising it before the PTAB.

    This ruling aligns with the January 2025 decision, where the court emphasized that procedural challenges must be properly raised at the PTAB stage, not on appeal.

    3. Means-Plus-Function Claims and Claim Construction

    Another major issue was the interpretation of means-plus-function claims under 35 U.S.C. § 112, ¶ 6.

    • The March 2025 decision reaffirmed that Numazaki adequately disclosed structures corresponding to the claimed “sensing means” and “computer means” in the ’431 patent.
    • Gesture’s arguments that the Numazaki reference did not sufficiently disclose tracking and image analysis were rejected—just as they were in the January 2025 case.

    4. PTAB’s Jurisdiction Over Expired Patents

    Gesture made a broader challenge, arguing that the PTAB lacks jurisdiction over expired patents—a claim it also raised unsuccessfully in the January case.

    • The March 2025 ruling definitively rejected this argument, reaffirming the Federal Circuit’s prior holding that expired patents remain subject to IPR challenges.
    • This decision aligns with the court’s reasoning in January 2025, reinforcing that patent expiration does not shield invalid claims from IPR proceedings.

    Implications for Patent Holders and Tech Companies

    The two 2025 Federal Circuit rulings offer several key lessons for companies engaged in patent litigation, particularly in the tech sector:

    1. Strengthen Patent Drafting & Prosecution – Ensure patents are clearly distinct from prior art to withstand obviousness challenges.
    2. Raise Procedural Challenges Early – Issues like IPR estoppel and standing must be raised at the PTAB stage, not for the first time on appeal.
    3. Be Strategic About IPRs – Defendants should carefully assess prior art before filing an IPR to maximize their chances of invalidation.

    With the continued expansion of gesture-based and optical-sensing technology, these cases serve as important precedents in software and hardware patent disputes.

    Final Thoughts: A Consistent Approach to Patent Challenges

    The January and March 2025 decisions together paint a clear picture:

    • The Federal Circuit remains deferential to PTAB findings, particularly in IPR proceedings.
    • Courts continue to take a rigorous approach to obviousness analysis, ensuring that patents covering well-known technologies do not survive merely due to clever claim drafting.
    • Expired patents remain vulnerable to challenges under IPR, reinforcing the importance of early and thorough patent prosecution strategies.

    As the tech industry continues to develop new gesture-based and camera-driven input systems, these rulings may have far-reaching consequences for how such patents are drafted, enforced, and challenged in the future.

    By Charles Gideon Korrell

  • Patent Litigation and Expert Testimony: Lessons from Trudell v. D R Burton

    The recent decision in Trudell Medical International Inc. v. D R Burton Healthcare, LLC by the United States Court of Appeals for the Federal Circuit highlights significant issues in intellectual property law, particularly in the realm of patent litigation. This case, which revolves around the infringement of U.S. Patent No. 9,808,588, serves as a critical reminder of the procedural and evidentiary requirements in patent disputes.

    Background of the Case

    Trudell Medical International Inc. (“Trudell”) sued D R Burton Healthcare, LLC (“D R Burton”) for infringement of its patent covering oscillatory positive expiratory pressure (OPEP) therapy devices. Trudell alleged that D R Burton’s vPEP®, iPEP®, PocketPEP®, and related products infringed claims 1–7, 9, and 18 of its patent. After a three-day trial, the jury found the asserted claims valid but not infringed.

    Trudell appealed on multiple grounds, including the improper admission of expert testimony by Dr. John Collins, an expert retained by D R Burton. The Federal Circuit ultimately reversed the district court’s decision allowing Dr. Collins’ testimony, granted a new trial on infringement, and ordered the case to be reassigned to a different judge.

    Key Legal Issues in the Case

    1. Expert Testimony and Compliance with Federal Rules

    One of the most significant issues in the case was the admission of expert testimony. Under Federal Rule of Civil Procedure 26(a)(2), expert reports must include a complete statement of opinions, the basis and reasons for those opinions, supporting data, and a list of prior cases where the expert has testified. Additionally, under Rule 37(c)(1), failure to disclose expert information as required by Rule 26 results in automatic exclusion unless the failure is substantially justified or harmless.

    The court found that D R Burton failed to comply with these disclosure requirements, as Dr. Collins did not submit a timely expert report on noninfringement. His testimony was introduced at trial despite not being disclosed during discovery, depriving Trudell of an opportunity to challenge or cross-examine his findings adequately. The court held that this failure was neither substantially justified nor harmless, leading to the exclusion of his testimony and the ordering of a new trial.

    2. Claim Construction and Expert Reliability

    The Federal Circuit also addressed issues with the methodology of Dr. Collins’ testimony. The district court had construed specific claim terms, including the definition of “a vane” and “rotate relative to the opening.” Despite this, Dr. Collins provided testimony that contradicted the court’s construction, effectively redefining key claim terms. His approach was deemed unreliable under Federal Rule of Evidence 702, which requires that expert opinions be based on reliable principles and methodologies.

    This aspect of the decision underscores the importance of ensuring that expert witnesses adhere to judicial claim constructions rather than reinterpreting patent terms in a manner inconsistent with the court’s ruling.

    3. The Impact of Procedural Missteps on Patent Trials

    Another crucial takeaway from this case is the procedural mismanagement at the district court level. The judge overseeing the case made multiple contradictory rulings regarding Dr. Collins’ testimony, initially excluding it, then allowing it, then reversing again. Additionally, comments made by the judge suggested a predisposition toward resolving the case quickly, rather than ensuring a fair trial. These concerns led the Federal Circuit to order a reassignment of the case to a different judge on remand—a rare but important corrective measure to preserve judicial impartiality.

    Implications for Patent Law and Litigation Strategy

    This decision has several important takeaways for patent litigants:

    • Strict Compliance with Expert Disclosure Rules: Failure to provide timely and complete expert reports can lead to exclusion of testimony, which can be case-dispositive in patent disputes.
    • Adherence to Claim Construction: Experts must base their testimony on the court’s claim construction and avoid introducing conflicting interpretations.
    • The Role of Judicial Conduct in Patent Trials: The reassignment of this case underscores the importance of judicial impartiality and procedural fairness in complex intellectual property disputes.

    Conclusion

    The Trudell v. D R Burton case highlights the complexities of patent litigation, particularly in the areas of expert testimony and claim construction. For attorneys and companies engaged in intellectual property disputes, this ruling reinforces the necessity of procedural diligence, expert reliability, and fair trial practices. As the case moves forward on remand, it will be interesting to see how the new trial unfolds without the tainted expert testimony that influenced the first jury’s verdict.

    By Charles Gideon Korrell

  • Federal Circuit Reverses JMOL in Steuben Foods Patent Case: Key Takeaways for IP Law

    In Steuben Foods, Inc. v. Shibuya Hoppmann Corporation, the Federal Circuit issued a major decision addressing key intellectual property issues related to patent infringement, claim construction, and the reverse doctrine of equivalents (RDOE). The case centered on aseptic food packaging technology, with the court analyzing whether Shibuya’s P7 aseptic bottling line infringed Steuben’s patents.

    This ruling highlights several crucial aspects of IP law, including the viability of RDOE as a defense, the interpretation of means-plus-function claims, and the application of the doctrine of equivalents. Below, we break down the major legal takeaways from this case.

    1. The Reverse Doctrine of Equivalents is Questioned but Not Eliminated

    One of the most significant aspects of the ruling was the court’s discussion of RDOE, an uncommon defense to literal infringement. Shibuya argued that even if its product fell within the literal scope of Steuben’s patent claims, it operated under a different principle and should not be found infringing.

    Steuben countered that RDOE was effectively eliminated by the 1952 Patent Act, which codified infringement rules in 35 U.S.C. § 271(a) and included limitations on overly broad claims under § 112. The Federal Circuit acknowledged that RDOE has been rarely applied and that there is an argument that it may no longer be viable. However, rather than making a definitive ruling on whether RDOE survived the 1952 Patent Act, the court found that the jury had substantial evidence to reject Shibuya’s RDOE argument. As a result, the court reversed the district court’s judgment as a matter of law (JMOL) and reinstated the jury’s infringement verdict for the ‘591 patent.

    2. Means-Plus-Function Claims and the Equivalence Test

    Another key issue involved the construction of means-plus-function claims in the ‘188 patent. The claims at issue used functional language to describe components of the aseptic filling system, such as a “means for filling” bottles at a specified rate. Under § 112, ¶ 6, such claims must be construed to cover the specific structures disclosed in the patent and their equivalents.

    The district court had found that Shibuya’s accused products, which used rotary wheels and neck grippers, did not infringe the means-plus-function claims because they operated differently from the patented conveyor and conveyor plate. However, the Federal Circuit reversed, emphasizing that the equivalence test must consider whether the accused structure performs the same function in substantially the same way to achieve the same result. The court found that Steuben presented substantial evidence that Shibuya’s rotary wheels and neck grippers were equivalent to the claimed structures, leading to a reinstatement of the jury’s verdict on the ‘188 patent.

    3. Limits on the Doctrine of Equivalents

    The court upheld JMOL of noninfringement for claims in the ‘985 patent, highlighting an important limitation on the doctrine of equivalents. The issue in this case was whether a sterilization system that added sterilant “continuously” could be deemed equivalent to a claim that required it to be added “intermittently.”

    The parties had stipulated that “intermittently added” meant “[a]dded in a non-continuous manner.” Given this definition, the court held that allowing a “continuous” system to be considered equivalent would vitiate the claim limitation entirely. This ruling reinforces the principle that the doctrine of equivalents cannot be used to erase clear claim limitations.

    4. Reinstating the Jury’s Verdict and Addressing New Trial Issues

    In addition to reversing JMOL on certain infringement claims, the Federal Circuit also vacated the district court’s conditional grant of a new trial on infringement and damages. Because the district court’s reasoning for ordering a new trial was tied to its JMOL findings—many of which were overturned—the Federal Circuit found no independent basis for a new trial.

    However, the court vacated and remanded the district court’s ruling on a new trial for invalidity and damages, as the lower court had provided no clear rationale for those decisions. This signals the importance of district courts articulating their reasoning clearly when granting new trials, especially in complex patent litigation.

    Key Takeaways for Patent Holders and Defendants

    This decision offers several key lessons for patent holders and defendants in intellectual property disputes:

    1. RDOE Remains a Questionable Defense – While the court did not rule on whether RDOE survived the 1952 Patent Act, it reinforced the principle that substantial evidence from a jury trial should not be overturned lightly.
    2. Means-Plus-Function Claims Require Proper Equivalence Analysis – When dealing with § 112, ¶ 6 claims, courts must carefully compare the structure and function of the accused product to the patent’s disclosed embodiments.
    3. Doctrine of Equivalents Has Limits – The decision confirms that the doctrine of equivalents cannot be used to override explicit claim limitations, particularly when the alleged equivalent is the opposite of the claim language.
    4. District Courts Must Provide Clear Justifications for New Trials – The Federal Circuit vacated a new trial ruling because the district court failed to articulate an independent basis for it.

    Conclusion

    The Steuben Foods decision provides important guidance on several areas of intellectual property law, particularly for companies engaged in patent disputes over manufacturing processes. While the Federal Circuit did not eliminate RDOE outright, it cast doubt on its viability, reinforcing that patentees should focus on claim construction and infringement theories rather than relying on outdated doctrines. The ruling also strengthens the application of means-plus-function claims and the doctrine of equivalents while ensuring that district courts justify their decisions with clear reasoning.

    As patent litigation continues to evolve, this case serves as a reminder of the complexities of IP law and the need for strategic approaches in patent enforcement and defense.

    By Charles Gideon Korrell

  • Federal Circuit Upholds Narrow Construction of DDR Holdings’ E-Commerce Patent Claims

    The Federal Circuit recently handed down a decision in DDR Holdings, LLC v. Priceline.com LLC, affirming a lower court’s interpretation of key claim terms in DDR’s U.S. Patent No. 7,818,399 (“’399 patent”). The ruling highlights the importance of claim construction in patent infringement litigation and underscores how courts evaluate intrinsic and extrinsic evidence in determining the scope of patent claims.

    Background: The ’399 Patent and the Dispute

    DDR Holdings sued Priceline.com and Booking.com (collectively, “Priceline”) for patent infringement, alleging that their websites violated DDR’s patented method of generating composite web pages that integrate third-party merchant content while preserving the “look and feel” of a host website. The central dispute in the case revolved around the meaning of the claim terms “merchants” and “commerce object”—both of which were pivotal in determining whether Priceline’s accused websites fell within the scope of DDR’s patent.

    After years of litigation, including a stay for inter partes review (IPR) before the Patent Trial and Appeal Board (PTAB), the district court ruled in favor of Priceline, adopting a narrower construction of both disputed terms. DDR appealed, arguing that the lower court had improperly limited the claims.

    Key Patent Law Issues Addressed

    1. Claim Construction and Intrinsic Evidence

    The Federal Circuit reaffirmed its approach to claim construction under Phillips v. AWH Corp., holding that claim terms should be interpreted in light of their plain and ordinary meaning within the context of the patent specification and prosecution history. The court rejected DDR’s argument that the term “merchants” should encompass providers of both goods and services.

    A key factor in this decision was that while DDR’s provisional application mentioned merchants as providers of “products or services,” the final patent specification referred only to merchants as providers of “goods.” The court found that this omission of “services” was deliberate and indicative of the applicant’s intent to exclude services from the claim scope.

    2. The Role of Provisional Applications in Claim Interpretation

    DDR argued that because the provisional application defined merchants as providers of both goods and services, the final patent should be read the same way. The court rejected this argument, emphasizing that a provisional application does not override changes made in the final patent specification. The court cited MPHJ Technology v. Ricoh Americas, where a similar omission from a provisional to a final patent was deemed significant in limiting claim scope.

    3. Deference to the Patent Trial and Appeal Board (PTAB)

    During the IPR, the PTAB had construed “merchants” more broadly, finding that the term could include service providers. DDR attempted to use this as collateral estoppel against Priceline, arguing that the issue had already been decided. However, the Federal Circuit rejected this argument, noting that the PTAB applies a different claim construction standard—the “broadest reasonable interpretation”—whereas courts use the more nuanced Phillips standard. This ruling reinforces that district courts and the Federal Circuit are not bound by PTAB claim constructions in later litigation.

    4. Narrow Construction of “Commerce Object”

    The district court also limited the definition of “commerce object” to products (goods) only, rejecting DDR’s argument that the term should include services. The Federal Circuit upheld this decision, reasoning that the patent specification never mentioned commerce objects in the context of services, reinforcing the exclusion of services from the claim scope.

    Implications for Patent Holders

    The DDR Holdings ruling serves as a critical reminder for patent applicants and litigators:

    • Draft Patent Specifications Carefully – Courts will scrutinize changes from a provisional application to a final patent and may interpret omissions as intentional claim scope limitations.
    • Intrinsic Evidence Prevails – The Federal Circuit reaffirmed that claim meaning is primarily determined from the patent specification and prosecution history, with little room for broader interpretations from external sources.
    • IPR Decisions Don’t Control Litigation – Even if the PTAB construes claims broadly during an IPR, that does not prevent a district court from applying a narrower construction under the Phillips framework.

    Conclusion

    The Federal Circuit’s decision in DDR Holdings v. Priceline.com reinforces the importance of precise patent drafting and highlights the challenges patentees face when arguing for broader claim interpretations in court. By affirming the lower court’s narrow construction, the ruling underscores that omissions in a patent specification can significantly limit claim scope, even when broader language appeared in a provisional application.

    For companies involved in e-commerce and software patents, this case serves as a cautionary tale: when defining the scope of an invention, what’s left out of a patent can be just as important as what’s included.

    By Charles Gideon Korrell

  • Federal Circuit Affirms Non-Infringement in Mirror Worlds v. Meta: Key Patent Law Takeaways

    On December 4, 2024, the Federal Circuit issued its decision in Mirror Worlds Technologies, LLC v. Meta Platforms, Inc., upholding the district court’s grant of summary judgment in favor of Meta (formerly Facebook) on all claims of patent infringement. The case, involving patents related to time-ordered data streams, raised important issues in patent law, particularly regarding claim construction, infringement, and patent eligibility under 35 U.S.C. § 101.

    Background of the Case

    Mirror Worlds Technologies, LLC alleged that Meta’s News Feed, Timeline, and Activity Log features infringed three of its patents:

    • U.S. Patent No. 6,006,227 (’227 patent)
    • U.S. Patent No. 7,865,538 (’538 patent)
    • U.S. Patent No. 8,255,439 (’439 patent)

    These patents cover methods for organizing and displaying digital information in chronological streams, a system designed to replace traditional folder-based file organization.

    Meta denied infringement and sought summary judgment on multiple grounds, including non-infringement and invalidity under § 101. The district court ruled in Meta’s favor, and Mirror Worlds appealed.

    Key Patent Law Issues Addressed in the Decision

    1. Claim Construction and the “Main Stream” Limitation

    One of the primary disputes in the case revolved around the construction of the term “main stream”, a key feature in the patented system. The patents required that every data unit received or generated by the system be included in the “main stream.” Meta argued, and the court agreed, that its accused systems (Multifeed Leaves and TimelineDB) did not store all received/generated data in a single time-ordered structure, as required by the patents.

    🔹 Court’s Ruling: The Federal Circuit upheld the district court’s finding that some information used by Meta’s systems—such as coefficient scores (which measure user relationships) and advertising data—was received by backend systems but not stored in the alleged “main stream.” This meant that Mirror Worlds could not prove literal infringement.

    🔹 Takeaway for Patent Owners: When drafting claims, precise language matters. If a claim requires that every piece of data be stored in a certain way, an accused infringer only needs to show that one type of data falls outside that structure to avoid infringement.

    2. The “Glance View” Limitation and Non-Infringement of the ’538 and ’439 Patents

    For two of the patents, Mirror Worlds relied on a feature called “glance view”, which required an abbreviated version of a document to be displayed when a user hovered over it. The court ruled that Meta’s accused features did not satisfy this limitation.

    🔹 Court’s Ruling: The district court found that Meta’s contextual dialog boxes (which appear when a user hovers over a link) provided only metadata—such as the source or author of a post—but did not present an actual summary of the document’s content. Because Mirror Worlds failed to present admissible evidence that the accused systems met this limitation, summary judgment was appropriate.

    🔹 Takeaway for Litigants: If a claim includes a specific display requirement, a successful infringement argument requires clear, admissible evidence that the accused product meets that requirement. Unauthenticated screenshots and expert testimony based on them will likely be excluded.

    3. Section 101 Patent Eligibility (Not Addressed)

    Meta cross-appealed the district court’s rejection of its argument that the patents were invalid under Alice Corp. v. CLS Bank Int’l, which governs patent eligibility under 35 U.S.C. § 101. However, because the court affirmed the non-infringement ruling, it declined to address the § 101 issue.

    🔹 Practical Implication: Courts often avoid ruling on patent validity issues when they can resolve a case on infringement grounds. This leaves open questions about whether Mirror Worlds’ patents would have survived a § 101 challenge.

    Final Thoughts: A Cautionary Tale for Patent Holders

    The Federal Circuit’s decision in Mirror Worlds v. Meta reinforces several key lessons for patent owners and litigants:

    1️⃣ Claim precision is critical – If a patent requires that a system include every data unit in a structure, any exception can defeat an infringement claim.
    2️⃣ Evidence matters – Courts will exclude unreliable evidence, such as unauthenticated screenshots, that fail to demonstrate a patent claim is met.
    3️⃣ Patent eligibility remains an open issue – The § 101 challenge was left undecided, but software patents, particularly those covering abstract ideas, continue to face heightened scrutiny.

    For companies developing software-based patents, this case underscores the importance of carefully drafted claims, thorough infringement analysis, and solid evidentiary support when asserting patent rights in court.

    By Charles Gideon Korrell

  • Federal Circuit Ruling in NexStep v. Comcast: Key Patent Law Takeaways

    On October 24, 2024, the United States Court of Appeals for the Federal Circuit issued a significant decision in NexStep, Inc. v. Comcast Cable Communications, LLC, affirming the district court’s ruling of non-infringement on two patents owned by NexStep. The case raised important questions about claim construction, the doctrine of equivalents, and evidentiary requirements for proving infringement. Below, we break down the key patent law principles addressed by the court.

    1. Claim Construction and the Meaning of “VoIP”

    One of the central disputes in the case revolved around the meaning of “VoIP” (Voice over Internet Protocol) in NexStep’s U.S. Patent No. 8,885,802 (‘802 patent). The court reaffirmed that claim terms must be interpreted as understood by a person skilled in the art at the time of the invention and that industry-standard definitions are crucial when a term is widely recognized.

    • The district court had construed “VoIP” to mean “protocols and data formats for transmitting voice conversations over a packet-switched network, such as the Internet.”
    • NexStep argued for a broader definition that would include any form of audio data transmission.
    • The Federal Circuit affirmed the district court’s narrower definition, holding that the term “VoIP” was well understood in the industry to require two-way voice communication, not just one-way audio transmission.

    Key Takeaway:

    Claim construction remains a critical aspect of patent litigation, and courts rely heavily on technical dictionaries, industry standards, and expert testimony to determine the proper scope of disputed terms.

    2. Doctrine of Equivalents and the “Single Action” Limitation

    The second major issue involved NexStep’s U.S. Patent No. 8,280,009 (‘009 patent), which described a “concierge device” that facilitates technical support sessions through a single user action. NexStep claimed that Comcast’s troubleshooting tools infringed this patent under the doctrine of equivalents, even though Comcast’s system required multiple button presses rather than a single action.

    • The jury initially found no literal infringement but ruled that Comcast’s system infringed under the doctrine of equivalents.
    • However, the district court overturned the jury’s finding, granting judgment as a matter of law (JMOL) for Comcast because NexStep’s expert, Dr. Ted Selker, failed to provide particularized testimony and linking argument showing why multiple actions were equivalent to a “single action.”

    Key Takeaway:

    To succeed under the doctrine of equivalents, patentees must provide specific, well-reasoned testimony explaining how the accused product meets each limitation of the claim in a substantially equivalent way. Generalized assertions of similarity are insufficient.

    3. Evidentiary Burdens in Patent Infringement Cases

    The decision highlights the strict evidentiary requirements needed to establish infringement under the doctrine of equivalents. The court emphasized three key principles:

    1. Element-by-Element Comparison:
      • A plaintiff must prove equivalence for each claim element, not just argue that the overall system is similar.
    2. Particularized Testimony and Linking Argument:
      • The plaintiff’s expert must provide detailed explanations connecting specific features of the accused product to the claimed invention.
    3. Avoiding Generalized Testimony:
      • Simply stating that an accused product functions “in the same way” as the claimed invention without further analysis is insufficient.

    The court concluded that NexStep’s expert testimony was too vague and conclusory to support an infringement verdict under the doctrine of equivalents.

    Key Takeaway:

    Courts are highly skeptical of broad assertions of equivalence without detailed, rigorous evidence. Patent litigants must ensure that their expert testimony is precise, thorough, and directly tied to the claim language.

    Final Thoughts

    The Federal Circuit’s decision in NexStep v. Comcast reinforces the importance of careful claim drafting, precise claim construction, and robust evidentiary standards in proving infringement. The ruling serves as a cautionary tale for patent holders seeking to rely on the doctrine of equivalents—generalized arguments and vague expert testimony will not withstand judicial scrutiny.

    For companies engaged in patent litigation, this case underscores the need to build a strong factual and expert witness foundation to support infringement claims. As courts continue to tighten evidentiary standards, litigants must ensure that their arguments are well-supported, their claim construction is well-reasoned, and their expert testimony is compelling and detailed.

    By Charles Gideon Korrell