Technology & Information Law Blog by Charles Gideon Korrell

Tag: IPR

  • Sage Products, LLC v. Stewart: “Sterile” Label in UK Document Found to Anticipate U.S. “Sterilized” Patent Claims

    Sage Products, LLC v. Stewart: “Sterile” Label in UK Document Found to Anticipate U.S. “Sterilized” Patent Claims

    In Sage Products, LLC v. Stewart, No. 2023-1603 (Fed. Cir. Apr. 15, 2025), the Federal Circuit affirmed the Patent Trial and Appeal Board’s (PTAB) finding that all challenged claims of Sage’s U.S. Patent Nos. 10,398,642 and 10,688,067 were unpatentable due to anticipation and obviousness. The ruling centered on whether a UK public assessment report (PAR) describing a product as “sterile” met the U.S. claim limitations requiring a “sterilized” composition. The court held that a skilled artisan would understand the regulatory meaning of “sterile” in the UK to include the concept of “sterilized” under U.S. patent law, thereby rendering the claims anticipated.

    Key Background

    Sage’s patents relate to sterilized chlorhexidine gluconate compositions used in antiseptic applicators. The PTAB instituted IPRs against multiple claims of these patents based on three grounds: (1) anticipation by the ChloraPrep PAR; (2) obviousness over the PAR and general knowledge; and (3) obviousness over the PAR in view of a U.S. publication (Degala).

    At issue was whether the PAR—an official regulatory document issued by the UK’s Medicines and Healthcare Products Regulatory Agency (MHRA)—disclosed a “sterilized” composition within the meaning of the claims.

    Key Prior Art and the “Sterile” vs. “Sterilized” Debate

    The PAR described a ChloraPrep product containing chlorhexidine gluconate and isopropyl alcohol for pre-operative skin disinfection, stating that the product is “sterile” and “sterile unless the seal is broken.” Importantly, the UK’s regulatory standard BS EN 556-1 defines “sterile” as having a sterility assurance level (SAL) of ≤10⁻⁶.

    The Board interpreted “sterilized” as requiring “a suitable sterilization process such that sterility can be validated,” and determined that a skilled artisan would equate the PAR’s “sterile” designation with this definition.

    Sage argued that this was a misreading, contending that even experts at the time misunderstood the ChloraPrep product to be sterile when it was not. Sage’s expert, Dr. Rutala, testified that the state of the art assumed ChloraPrep’s active antiseptic solution was not sterilized. However, the Board credited the testimony of BD’s expert, Dr. Dabbah, who explained that a skilled artisan with at least four years of experience in sterilization would understand that the UK labeling requirements effectively guaranteed terminal sterilization compliant with BS EN 556-1.

    The Federal Circuit’s Analysis

    The court upheld the PTAB’s factual findings under the substantial evidence standard:

    • Regulatory Understanding: The court found it “implausible” that a skilled artisan would be unaware of UK regulatory standards that governed the PAR’s use of the term “sterile.”
    • SAL and Composition Claims: The court affirmed that the PAR, read in light of BS EN 556-1, disclosed a sterilized composition with an SAL in the claimed range (10⁻³ to 10⁻⁹).
    • Dependent Claims: The court also upheld the Board’s findings that limitations such as a “sterilized colorant” were met, based on the overall characterization of the product as “sterile.”
    • Procedural Arguments: The court rejected Sage’s argument that the Board exceeded the scope of the IPR or improperly relied on extrinsic evidence. Expert testimony and references like Degala and Chiang were permissible to help interpret what the PAR disclosed to a skilled artisan.
    • Enablement: The court found no error in the Board’s reliance on other references to confirm that the methods of sterilization disclosed in the PAR were enabled.

    Takeaway

    This case underscores the importance of considering the regulatory context and the knowledge of a person of ordinary skill when interpreting foreign public documents during validity challenges. Here, the Federal Circuit signaled that official regulatory language, such as “sterile,” can carry weight under U.S. patent law when understood to meet the technical requirements of a claim—even when arising from a different jurisdiction.

    Moreover, this opinion reinforces that a patent challenger can use a combination of prior art and expert testimony to establish that a foreign document anticipates U.S. patent claims, especially when such a document reflects regulatory compliance with rigorous standards like BS EN 556-1.

    By Charles Gideon Korrell

  • Patent Battles in Wearable Tech: AliveCor v. Apple and the Fight Over Arrhythmia Detection

    Patent Battles in Wearable Tech: AliveCor v. Apple and the Fight Over Arrhythmia Detection

    On March 7, 2025, the Federal Circuit issued its decision in AliveCor, Inc. v. Apple Inc., upholding the U.S. Patent and Trademark Office’s Patent Trial and Appeal Board (PTAB) ruling that invalidated AliveCor’s patents on heart rate monitoring technology. The case has significant implications for the wearable technology industry, particularly in the areas of patentability, obviousness, and the interplay between patent litigation and administrative patent challenges.

    Background of the Case

    AliveCor, a medical technology company, held patents covering systems and methods for detecting cardiac arrhythmias using wearable devices. The key patents in dispute—U.S. Patent Nos. 9,572,499, 10,595,731, and 10,638,941—described a technology involving smartwatches equipped with photoplethysmography (PPG) sensors to monitor heart rate, notify users of irregularities, and prompt them to conduct electrocardiogram (ECG) recordings for further analysis.

    Apple challenged these patents through inter partes review (IPR) at the PTAB, arguing that the claims were obvious in light of prior art references. The Board ruled in Apple’s favor, finding that the claims lacked novelty. AliveCor appealed to the Federal Circuit, arguing that the PTAB’s conclusions on obviousness were incorrect and that Apple had withheld evidence relevant to secondary considerations of non-obviousness.

    Key Legal Issues

    1. Obviousness of Machine Learning-Based Arrhythmia Detection

    AliveCor’s patents included claims requiring the use of machine learning algorithms to detect arrhythmias based on heart rate data. The court affirmed the PTAB’s determination that this approach was obvious in view of prior art references, particularly:

    • Hu 1997: A study describing a patient-adaptable ECG classifier that employed machine learning to detect cardiac conditions.
    • Li 2012: A research paper discussing the use of machine learning to reduce false arrhythmia alarms by integrating multiple physiological signals.
    • Shmueli Patent Application (2012): A prior patent application disclosing a wrist-mounted heart monitoring device that used both PPG and ECG data to detect and confirm irregular heart activity.

    The Federal Circuit concluded that a person of ordinary skill in the art would have been motivated to combine these techniques, reinforcing the Board’s finding that AliveCor’s claimed use of machine learning was not sufficiently novel.

    2. “Confirmation” Step in Arrhythmia Detection

    Another key issue was whether the requirement to confirm an arrhythmia using ECG data was patentable. AliveCor argued that its method—detecting arrhythmia using PPG data and then confirming it using an ECG—was unique. However, Apple successfully argued that Shmueli already disclosed this concept. The PTAB and the Federal Circuit both found that a skilled artisan would have found it obvious to confirm PPG-based arrhythmia detection with ECG, leading to the invalidation of the relevant claims.

    3. Failure to Produce Secondary Consideration Evidence

    AliveCor also contended that Apple failed to disclose evidence from a parallel International Trade Commission (ITC) investigation, which had considered secondary indicators of non-obviousness, such as commercial success and industry praise. AliveCor claimed that Apple’s withholding of this evidence violated discovery obligations.

    However, the Federal Circuit found that AliveCor had forfeited this argument by failing to raise the issue before the PTAB. The court emphasized that procedural diligence is essential in IPR proceedings and that issues must be timely presented to be considered on appeal.

    Implications for Intellectual Property Law

    This decision underscores several critical points in patent law and intellectual property strategy:

    • Obviousness in Emerging Technologies: Courts and the PTAB continue to scrutinize patents in fast-evolving fields like machine learning and wearable tech, often finding that incremental improvements fail to meet the non-obviousness requirement.
    • Interplay Between Patent Litigation and IPRs: The case highlights the increasing role of inter partes reviews in invalidating patents that might otherwise survive district court litigation.
    • Procedural Rigor in Patent Challenges: Parties must be meticulous in raising all relevant issues during PTAB proceedings; failure to do so may result in forfeiture on appeal.

    Conclusion

    The Federal Circuit’s decision in AliveCor v. Apple represents a significant win for Apple and a cautionary tale for patent holders in the medical technology space. As courts and administrative bodies continue to apply strict standards for patent validity, companies seeking to protect their innovations must ensure their patents contain clear, non-obvious advancements over existing technology. Moreover, maintaining procedural diligence in parallel patent litigation and administrative proceedings is crucial to avoiding unfavorable rulings on appeal.

    As wearable health technology continues to advance, the legal battles over patentability will shape the competitive landscape, influencing which companies can dominate the market with their innovations.

    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

  • Federal Circuit Weighs in on Gesture-Controlled Camera Patent Dispute

    In a significant ruling on patent validity and inter partes review (IPR) jurisdiction, the Federal Circuit recently decided Apple Inc. v. Gesture Technology Partners, LLC, a case addressing the patentability of gesture-based camera control technology. The decision clarifies key issues surrounding the obviousness of patents, the scope of IPR proceedings, and the ability of the Patent Trial and Appeal Board (PTAB) to review expired patents.

    Background of the Case

    Gesture Technology Partners, LLC (“Gesture”) owns U.S. Patent No. 8,878,949 (“the ’949 patent”), which describes a portable device incorporating an electro-optical sensor that detects gestures and controls a digital camera accordingly. Apple, alongside LG Electronics and Google, challenged the patent through an IPR, arguing that multiple claims were unpatentable due to obviousness over prior art references.

    The PTAB ruled that claims 1–3, 5–10, and 12–17 were unpatentable but upheld the validity of claims 4, 11, and 18. Both parties appealed: Apple contested the decision upholding claim 4, while Gesture cross-appealed the unpatentability findings against claims 1–3 and 5–7.

    Key Legal Issues Addressed

    1. PTAB’s Authority to Review Expired Patents

    One of the central issues in Gesture’s cross-appeal was whether the PTAB had jurisdiction over the IPR, given that the ’949 patent had expired before Apple filed its petition. Gesture argued that an expired patent ceases to be a public franchise and is thus outside the PTAB’s purview.

    The Federal Circuit rejected this argument, reaffirming that expired patents can still be subject to IPR because they retain enforceable rights, such as claims for past damages. The court emphasized that IPR proceedings serve as a “second look” at the initial patent grant, aligning with the Supreme Court’s reasoning in Oil States Energy Services v. Greene’s Energy Group (2018).

    2. Obviousness and Prior Art Considerations

    The Federal Circuit upheld the PTAB’s finding that claims 1–3 and 5–7 were unpatentable as obvious in light of prior art, particularly U.S. Patent No. 6,144,366 (Numazaki) and Japanese Patent Application No. H4-73631 (Nonaka). The court found that:

    • Numazaki’s light extraction unit, which detects user interactions, corresponds to the electro-optical sensor claimed in the ’949 patent.
    • A skilled person would have been motivated to combine Numazaki’s different embodiments and Nonaka’s remote-control functionality to create a device that captures images based on gesture recognition.
    • Gesture’s expert failed to provide sufficient technical reasoning to dispute the Board’s obviousness findings.

    3. Reversal of PTAB’s Decision on Claim 4

    Apple successfully challenged the PTAB’s ruling on claim 4, which required the electro-optical sensor to be “fixed” in relation to the digital camera. The Federal Circuit found that the PTAB improperly disregarded Apple’s expert testimony, which demonstrated that fixing these components was an obvious design choice for maintaining overlapping fields of view. As a result, the court reversed the PTAB’s finding, declaring claim 4 unpatentable.

    Implications for Intellectual Property Law

    This ruling underscores the Federal Circuit’s approach to obviousness analyses and reinforces the PTAB’s authority over expired patents. The decision also highlights the importance of expert testimony in IPR proceedings—both in establishing obviousness and in defending against it.

    For patent holders, the case serves as a cautionary tale about the vulnerabilities of broad, technology-based claims in the face of prior art. For challengers, it confirms that IPR remains a powerful tool for invalidating weak patents, even post-expiration.

    Conclusion

    The Apple v. Gesture decision provides important clarity on the role of IPR in expired patents and the standards for proving obviousness in technology-related patents. With the court’s ruling, Apple, LG, and Google have successfully invalidated additional claims of the ’949 patent, reinforcing the competitive landscape in the field of gesture-based camera technology.

    By Charles Gideon Korrell

  • Lynk Labs v. Samsung: Federal Circuit Clarifies Prior Art Status of Published Patent Applications in IPRs

    On January 14, 2025, the United States Court of Appeals for the Federal Circuit issued a pivotal decision in Lynk Labs, Inc. v. Samsung Electronics Co., Ltd., affirming the invalidation of certain claims in Lynk Labs’ U.S. Patent No. 10,687,400 (the ’400 patent) through inter partes review (IPR). The case primarily addressed a critical question in patent law: when does a published patent application qualify as prior art in an IPR? The Federal Circuit confirmed that a published patent application can be deemed prior art as of its filing date, significantly impacting how prior art is evaluated in IPR proceedings.

    Background of the Case

    The ’400 patent, held by Lynk Labs, pertains to alternating current (AC) driven LED technology. Samsung challenged the validity of claims 7–13 and 15–17 of the patent under 35 U.S.C. § 103 (obviousness), relying in part on U.S. Patent Application Publication No. 2004/0206970 (referred to as “Martin”). While the Martin application was filed before the priority date of the ’400 patent (February 25, 2004), it was not published until October 21, 2004. Lynk Labs contended that because Martin was not publicly available before the priority date, it should not be considered prior art in the IPR proceeding.

    Key Legal Issue: Prior Art Status of Published Patent Applications

    Lynk Labs argued that under the traditional understanding of prior art printed publications under 35 U.S.C. § 102(a) and (b), a reference must be publicly accessible before the relevant priority date to be considered prior art. In contrast, Samsung maintained that under § 102(e)(1), a U.S.-filed patent application published under 35 U.S.C. § 122(b) can be treated as prior art as of its filing date, regardless of when it became publicly accessible.

    The Federal Circuit sided with Samsung, holding that under § 102(e)(1), a published patent application serves as prior art as of its filing date, provided it was filed before the claimed invention. This interpretation aligns with prior cases recognizing that patents granted on such applications are also considered prior art as of their filing date under § 102(e)(2). The ruling underscores that Congress intended a different treatment for published patent applications compared to other printed publications such as journal articles and technical papers.

    Implications for Intellectual Property Law

    The Federal Circuit’s decision has significant implications for patent owners and IPR petitioners:

    1. Expanded Scope of Prior Art in IPRs: This ruling solidifies that a published patent application can be used as prior art in an IPR based on its filing date, even if it was not publicly available before the challenged patent’s priority date. This expands the range of prior art that can be leveraged in patent challenges.
    2. Greater Risk for Patent Holders: Patent applicants must be aware that even unpublished applications filed before their invention can be cited against them in an IPR, potentially increasing the risk of invalidation.
    3. Strategic Considerations for Patent Drafting: Innovators should carefully evaluate their filing strategies, including provisional applications and continuation practices, to ensure that their own filings are structured to avoid unintended prior art issues.

    Other Legal Issues Addressed

    Beyond the prior art issue, the court also reviewed claim construction disputes:

    • Series Connection of LEDs: The court upheld the Board’s broad interpretation of “a plurality of LEDs connected in series” to include both individual LEDs and LED circuits. This reinforced the principle that claim terms should be interpreted based on intrinsic evidence from the specification.
    • Matching Forward Voltage to Rectified Input AC Voltage: The court also agreed with the Board’s interpretation that “matches” does not require an exact equivalence but can include cases where the input voltage is less than or equal to the LED circuit’s forward voltage.

    Conclusion

    The Federal Circuit’s ruling in Lynk Labs v. Samsung provides crucial clarity on how published patent applications function as prior art in IPRs. By affirming that such applications can serve as prior art as of their filing date, the decision strengthens the ability of IPR petitioners to challenge patents using prior-filed but later-published applications. For patent holders, this ruling serves as a reminder to carefully consider prior filings when assessing patentability and preparing for potential IPR challenges. As the landscape of patent litigation continues to evolve, this case stands as a key precedent in the interpretation of prior art rules under U.S. patent law.

    By Charles Gideon Korrell

  • Federal Circuit Vacates PTAB Decision in Palo Alto Networks v. Centripetal Networks: Key Patent Law Takeaways

    On December 16, 2024, the Federal Circuit issued an opinion in Palo Alto Networks, Inc. v. Centripetal Networks, LLC, vacating and remanding a decision by the Patent Trial and Appeal Board (PTAB) in an inter partes review (IPR) proceeding. The ruling highlights critical issues in patent law, particularly regarding obviousness, motivation to combine, and the sufficiency of PTAB’s reasoning in IPR decisions.

    Background of the Case

    The dispute concerns U.S. Patent No. 10,530,903 (the ’903 patent), owned by Centripetal Networks, which covers a system for correlating network packets to improve cybersecurity by de-obfuscating packet sources. Palo Alto Networks (PAN) petitioned for IPR, arguing that the claims were obvious over a combination of three prior art references, with the key dispute centering on whether two references—Paxton and Sutton—could be combined to teach a crucial limitation in the patent.

    The PTAB ultimately ruled in favor of Centripetal, finding that PAN had not sufficiently demonstrated the claimed invention was obvious. PAN appealed, arguing that the Board failed to properly analyze the motivation to combine the references.

    Key Patent Law Issues Addressed

    1. Motivation to Combine and the “Necessary Bridge”

    One of the most important legal issues in this case was whether PAN had sufficiently established a motivation to combine the teachings of Paxton (which disclosed packet correlation techniques) and Sutton (which disclosed methods for notifying administrators of potential malicious activity).

    PAN contended that it would have been obvious to modify Paxton’s system by incorporating Sutton’s notification method to improve cybersecurity. The Board, however, concluded that there was no clear “bridge” between the two references that would support a motivation to combine.

    The Federal Circuit found that the Board failed to make a clear finding on the motivation to combine and did not adequately explain what it meant by the “necessary bridge” between Paxton and Sutton. The court emphasized that when an obviousness challenge is raised, the Board must explicitly find whether a motivation exists and provide a clear rationale. Citing In re Nuvasive, Inc., the court reiterated that a Board decision must include specific findings rather than vague assertions that a motivation was not sufficiently demonstrated.

    2. Evaluating Prior Art Combinations as a Whole

    The Federal Circuit also criticized the Board’s piecemeal analysis of the prior art. The PTAB evaluated Paxton and Sutton in isolation rather than considering them together as a combination. The court clarified that the correct test for obviousness is not whether any single reference discloses all claim limitations, but whether a skilled artisan would find it obvious to combine the teachings of multiple references.

    This aligns with the Supreme Court’s ruling in KSR Int’l Co. v. Teleflex Inc., which rejected a rigid approach to obviousness in favor of a more flexible, common-sense inquiry. By failing to consider the prior art references in combination, the PTAB misapplied the law and failed to properly analyze whether the combined references taught the disputed claim limitation.

    3. The Importance of Clear Reasoning in PTAB Decisions

    The Federal Circuit underscored that the PTAB’s reasoning must be sufficiently detailed to allow for meaningful appellate review. While the court does not reweigh evidence, it must ensure that the PTAB’s decisions are supported by substantial evidence and clearly articulated findings.

    The decision in this case reinforces prior holdings, such as in Gechter v. Davidson, which stress that PTAB opinions must be sufficiently reasoned and cannot leave key issues unresolved. The court found that the Board’s failure to explain whether PAN’s arguments about obviousness were valid required a remand.

    Conclusion and Impact on Future Cases

    The Federal Circuit’s decision in Palo Alto Networks v. Centripetal Networks serves as a reminder that PTAB decisions must be clear, specific, and legally sound when analyzing obviousness and motivation to combine. For practitioners handling IPRs, this case highlights the importance of:

    • Providing a well-reasoned explanation for why prior art references should or should not be combined.
    • Ensuring that PTAB panels properly evaluate prior art combinations as a whole rather than in isolation.
    • Holding PTAB accountable for issuing decisions that contain detailed findings and sufficient reasoning to withstand appellate scrutiny.

    As the case is remanded, PTAB will need to reconsider its findings on motivation to combine and whether the combined prior art discloses all claim elements. This ruling could influence future PTAB proceedings by emphasizing the need for thorough and well-supported decisions in IPR disputes.

    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

  • Platinum Optics v. Viavi: Dismissal of Appeal for Lack of Standing Despite Prior Infringement Disputes

    Platinum Optics v. Viavi: Dismissal of Appeal for Lack of Standing Despite Prior Infringement Disputes

    In Platinum Optics Technology Inc. v. Viavi Solutions Inc., No. 23-1227 (Fed. Cir. Aug. 16, 2024), the Federal Circuit dismissed an appeal from an inter partes review (IPR) decision for lack of Article III standing. The court declined to reach the merits of the Patent Trial and Appeal Board’s (PTAB) decision upholding the validity of Viavi’s U.S. Patent No. 9,354,369, which claims optical filters using hydrogenated silicon with precise optical properties.

    Background

    Viavi’s ’369 patent claims a hydrogenated silicon material with a high refractive index (n > 3) and low extinction coefficient (k < 0.0005) over a wavelength range of 800–1100 nm—properties touted as enhancing optical filter performance. Platinum Optics Technology Inc. (PTOT) challenged the claims in an IPR, arguing obviousness based on prior art including Pilgrim, Gibbons, Lairson, and Yoda. The PTAB disagreed, concluding that the specific combination of optical properties was not taught or suggested in the cited references and would have required significant experimentation without an expectation of success.

    Following this defeat, PTOT sought Federal Circuit review—but was met with a standing challenge.

    No Injury, No Standing

    The court reiterated that unlike participation before the PTAB, appeal to the Federal Circuit requires Article III standing. Relying on Lujan v. Defenders of Wildlife, 504 U.S. 555 (1992), Spokeo, Inc. v. Robins, 578 U.S. 330 (2016), and Phigenix, Inc. v. Immunogen, Inc., 845 F.3d 1168 (Fed. Cir. 2017), the panel emphasized the need for a “concrete and particularized” injury.

    PTOT cited two bases for standing: (1) continued distribution of the same products previously accused of infringing the ’369 patent, and (2) development of new optical filters. But the infringement claims involving the ’369 patent had been dismissed with prejudice in earlier district court actions (Viavi I and Viavi II), foreclosing future liability from those suits. Citing Apple Inc. v. Qualcomm Inc., 992 F.3d 1378 (Fed. Cir. 2021), and Prasco, LLC v. Medicis Pharm. Corp., 537 F.3d 1329 (Fed. Cir. 2008), the court held that PTOT’s speculation about the risk of future litigation did not amount to a substantial risk of infringement or a threat sufficient to establish standing.

    As to the new products under development, the court found the supporting declaration from PTOT’s executive vague and conclusory. Following JTEKT Corp. v. GKN Auto. LTD., 898 F.3d 1217 (Fed. Cir. 2018), and Allgenesis Biotherapeutics Inc. v. Cloudbreak Therapeutics, LLC, 85 F.4th 1377 (Fed. Cir. 2023), the court explained that declarations lacking specific technical detail or concrete plans cannot support a finding of injury in fact.

    Key Takeaways

    • A history of litigation—without more—does not establish standing to appeal an IPR decision, particularly where infringement claims have been dismissed with prejudice.
    • General assertions about ongoing product development are insufficient. Concrete, detailed plans and a plausible risk of suit are necessary to satisfy Article III.
    • PTOT’s inability to cross the standing threshold means the Federal Circuit left undisturbed the PTAB’s substantive finding that the ’369 patent was not shown to be obvious over the prior art.

    While the technical validity of Viavi’s patent remains intact, Platinum Optics underscores a strategic pitfall for petitioners: an IPR loss cannot always be appealed, even after contentious district court litigation. Petitioners should consider standing implications early—especially if litigation history may later undercut injury arguments on appeal.

    By Charles Gideon Korrell