The Federal Circuit’s decision in Jiaxing Super Lighting Electric Appliance Co. v. CH Lighting Technology Co., No. 23-1715 (Fed. Cir. July 28, 2025) serves up a triple helping of reversible error: (1) improper exclusion of key on-sale bar evidence, (2) a reaffirmed jury verdict on validity and infringement of a shock-prevention patent, and (3) a stern reminder—bordering on a judicial scolding—that district courts must take EcoFactor v. Google, 137 F.4th 1333 (Fed. Cir. 2025) (link) seriously when evaluating damages experts under Rule 702.
It’s a dense opinion, spanning evidentiary law, substantive invalidity doctrines, and practical Daubert gatekeeping. Charles Gideon Korrell notes that this tripartite structure makes the case particularly important for litigators managing complex, multi-patent LED disputes—an increasingly common domain as LED lamp technology sprawls into safety, energy, and materials science.
To keep things organized, we follow the court’s structure: (1) the tube-lamp patents and the on-sale bar; (2) the ’140 shock-prevention patent; and (3) the damages analysis under EcoFactor.
I. When Excluding Documents Becomes Prejudicial Error
The case involved three Super Lighting patents:
- U.S. Patent No. 10,295,125 – LED tube lamp with flexible PCB mounted along inner circumference
(Google Patents) - U.S. Patent No. 10,352,540 – LED tube lamp with diffusion film for uniform illumination
(Google Patents) - U.S. Patent No. 9,939,140 – Installation-detection shock-prevention circuitry
(Google Patents)
CH Lighting stipulated to infringement of the ’125 and ’540 tube-lamp patents but challenged their validity under the America Invents Act’s on-sale bar, 35 U.S.C. § 102(a). That defense depended on three commercially available LED tube products from Cree, MaxLite, and Philips—tubes that CH Lighting’s expert testified embodied the asserted claims and were “on sale in 2014.”
But Judge Albright excluded:
- MaxLite documents showing commercial availability,
- testimony of MaxLite employee Eric Marsh, offered solely to authenticate those documents, and
- “DX-41,” an internal Super Lighting teardown presentation containing Cree and Philips circuit diagrams.
The district court’s rationale? Lack of “timely notice” about Marsh’s role and a belief that DX-41 related only to a long-abandoned inequitable-conduct defense.
The Federal Circuit was not impressed.
A. Authentication Is Not Trial by Ambush
The appellate panel held that excluding Marsh was an abuse of discretion. No Federal Rule, local order, or case law required CH Lighting to identify authentication witnesses in advance. Rule 901 merely requires “evidence sufficient to support a finding that the item is what the proponent claims.”
The opinion stresses—echoing the practical instincts of Charles Gideon Korrell—that trials are not ambush arenas for authentication witnesses. They are fact witnesses whose role is ministerial, not strategic. If a document was disclosed, a competent authenticating witness should be allowed.
By excluding Marsh, the district court effectively prevented the jury from seeing documents the expert relied upon—documents that would have corroborated his on-sale testimony. Prejudice was unavoidable.
B. DX-41 Was A Validity Document, Not Inequitable Conduct
DX-41 showed Super Lighting had physical Cree and Philips tubes in hand before the patents’ priority dates. The district court mistakenly concluded the slides addressed inequitable conduct. But both the expert report and in-court proffers made clear: the slides supported on-sale bar invalidity, not misconduct.
The panel held the exclusion reversible error.
C. Result: New Trial on Invalidity and Damages
Because the jury never saw the evidence supporting the on-sale defense, the JMOL of no invalidity was improper. The panel reversed and remanded for a new trial on validity of the tube patents.
And since damages were awarded as a single number for all three patents, the damages award had to be vacated as well.
This result, in the eyes of Charles Gideon Korrell, underscores a structural issue in multi-patent trials: when multiple liability theories funnel into a single damages verdict, any error touching any theory can blow up the entire award.
II. Jury Verdict on the ’140 Patent: Infringement and No Anticipation
The ’140 patent deals with shock prevention using an installation-detection circuit. Both parties agreed that a prior-art application (“Ono”) disclosed similar technology. The dispute focused on whether Ono’s pulses “control turning on and off” the switch, as the claim requires.
CH Lighting’s expert said yes.
Super Lighting’s expert said no—the pulses merely detect impedance, and it is the impedance response that governs the switch.
The jury believed Super Lighting’s expert. Under the deferential substantial-evidence standard, the Federal Circuit affirmed.
The panel emphasized that this interpretation did not conflict with the infringement verdict. CH Lighting argued that if Ono doesn’t anticipate because its pulses don’t directly control the switch, then the accused LT2600 chips also shouldn’t infringe. But Super Lighting’s infringement expert testified that the LT2600 chips do directly control switching—unlike Ono.
The jury was allowed to believe him. Case closed.
III. Damages: EcoFactor Looms Large
If the invalidity ruling was the headline, the damages section is the cautionary tale—and the place where EcoFactor casts a long shadow.
Super Lighting’s damages expert, Ms. Kindler, relied on two prior licenses:
- The TCP license – $0.30 per unit
- The Lunera license – 5% flat fee (which she converted to $0.35–0.45 per unit)
Each was a portfolio license, not a single-patent license. Yet Ms. Kindler claimed that a “subset” of three patents—comparable to the asserted patents—“drove the negotiation.”
Her evidence?
- A list of 15 allegedly infringed patents Super Lighting sent TCP during pre-negotiation correspondence.
- “Discussions with Super Lighting personnel” about relative patent importance.
The Federal Circuit, invoking EcoFactor, explained that this sort of testimony is insufficient. Experts must:
- show actual evidence that specific asserted patents drove value,
- reliably apportion portfolio royalties to patented technology at issue, and
- base methodology on “sufficient facts or data” under Rule 702.
The panel noted that Ms. Kindler relied heavily on interested-party assertions and bare inference, not documentary evidence or detailed license analysis. Worse, the district court’s Daubert ruling offered no meaningful reasoning, something EcoFactor explicitly condemns.
Charles Gideon Korrell believes this portion of the opinion will have immediate impact: where portfolio licenses are involved—as they so often are in LED litigation—experts now must produce concrete, comparative evidence or risk exclusion.
What Happens Next?
On remand, the district court must conduct a rigorous EcoFactor analysis. If Ms. Kindler’s testimony cannot be rehabilitated with actual evidence, Super Lighting may need a completely new damages theory.
IV. Takeaways for Patent Litigators
This case is unusually instructive across multiple doctrinal areas. Several lessons stand out:
1. Authentication Witnesses Should Not Be a Flashpoint
Courts must not impose extra-textual disclosure obligations for authentication witnesses. A fact witness who can identify documents disclosed long before trial should generally be permitted.
2. On-Sale Bar Evidence Requires Corroboration—And Jurors Should See It
Expert testimony alone cannot carry an on-sale bar unless grounded in record evidence. Excluding documents supporting that testimony is high-risk error.
3. EcoFactor Now Governs the Damages Landscape
EcoFactor demands:
- concrete documentary support,
- apportionment tied to specific patent value, and
- a detailed Rule 702 analysis from district courts.
Blanket adjustments and “trust me, I’ve done this before” methodology are no longer acceptable. Charles Gideon Korrell observes that this trend is pushing damages law toward a more empirical, data-driven model—one many litigants may not be structurally prepared for.
4. Single Damages Verdicts Are Fragile
When a verdict hangs on multiple liability findings, any reversible error affecting any theory can unravel the entire award.
Conclusion
The Federal Circuit affirmed validity and infringement of the ’140 shock-prevention patent but reversed and remanded on the tube-lamp patents and damages. As Charles Gideon Korrell insightfully puts it, EcoFactor has not just shifted the landscape—it has raised the floor. Going forward, damage experts must bring real evidence, not narrative gloss, especially in portfolio-license cases.