Largan Precision v. Motorola Mobility: Federal Circuit Affirms Imaging Lens Patent Unpatentable
Largan Precision Co., Ltd. appealed to the U.S. Court of Appeals for the Federal Circuit to defend US9784948B2, covering an imaging lens system, against Motorola Mobility’s invalidity challenge. The Federal Circuit affirmed the finding of unpatentability, extinguishing the patent after a 547-day appellate proceeding.
Federal Circuit seals the fate of Largan’s mobile imaging lens patent
Largan Precision Co., Ltd., a leading Taiwan-based optical lens manufacturer and holder of US9784948B2, filed this Federal Circuit appeal on 6 March 2024 challenging a prior determination that its imaging lens system patent was unpatentable. The patent-in-suit, filed under application number US15/067369, protects a compact multi-element imaging lens architecture of the type widely used in smartphone camera modules. Motorola Mobility, Inc. was the prevailing challenger below.
On 4 September 2025, the Federal Circuit issued a summary affirmance — ordered and adjudged ‘AFFIRMED’ — upholding the finding of unpatentability. The basis of termination is recorded as ‘Unpatentable’, confirming that the underlying invalidity or cancellation action succeeded on the merits and was not disturbed on appeal. For Largan, this means US9784948B2 is extinguished as an enforceable asset. For Motorola Mobility, the affirmance provides a clean freedom-to-operate posture with respect to this specific claim set.
The 547-day duration from filing to closure is consistent with a substantive merits review rather than a procedural dismissal, suggesting the Federal Circuit examined the patentability arguments in detail before affirming. What drove the underlying invalidity finding — prior art, obviousness, or written description — is not disclosed in the appellate order itself, and the full reasoning would reside in the tribunal’s written opinion or the record below. Whether Largan pursues en banc rehearing or certiorari remains unknown from the public record.
Filing to Unpatentable in 547 days
547-day appellate proceeding — longer than the median Federal Circuit appeal
Federal Circuit affirms: what the unpatentability ruling means for both parties
Affirmance means the lower unpatentability finding survives intact
When the Federal Circuit issues an ‘AFFIRMED’ judgment, it finds no reversible error in the decision under review. The appellate court does not substitute its own findings — it confirms that the tribunal below correctly applied the law and reached a supportable conclusion. Here, the unpatentability determination survives every argument Largan raised on appeal, and the patent is formally cancelled or invalidated as a consequence.
No reversible error foundUS9784948B2 is extinguished — Largan loses this enforcement asset
For Largan Precision, the affirmance is a definitive adverse outcome. US9784948B2 can no longer be asserted against any party. Any licensing revenue or exclusivity tied to this patent is lost, and competitors who had exposure under this claim set may now operate freely. Largan’s remaining appellate options — en banc rehearing or a petition for certiorari to the Supreme Court — face a high bar given the Federal Circuit’s clear affirmance.
Patent extinguished on appealMotorola Mobility secures a clean FTO on this imaging lens claim set
Motorola Mobility’s successful invalidity challenge has been fully vindicated at the Federal Circuit level. The affirmance eliminates the residual litigation risk that a reversal would have restored. Motorola and any third party designing mobile imaging lens systems covered by the former claims of US9784948B2 can now proceed without exposure to this specific patent. The decision also strengthens Motorola’s position in any parallel or related IP disputes involving Largan’s portfolio.
FTO confirmed for challengerImaging lens competitors gain clarity — Largan’s enforcement posture weakened
US9784948B2 targeted compact multi-element optical designs central to smartphone camera modules — a high-volume, high-stakes segment. Its cancellation removes a potential licensing barrier for OEMs and lens module suppliers that had exposure to Largan’s claim scope. For the broader optics sector, the ruling signals that the Federal Circuit was unconvinced by Largan’s patentability arguments, which may inform how competitors assess the vulnerability of adjacent Largan patents covering similar optical architectures.
Sector IP barrier removedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Largan Precision Co., Ltd. | Company | Taiwan optical lens manufacturer — holder of US9784948B2 imaging lens system patentSearch in Eureka ↗ |
| Defendant | Motorola Mobility, Inc. | Company | Motorola Mobility, Inc. — mobile device maker, successful invalidity challenger belowSearch in Eureka ↗ |
| Plaintiff counsel | Kevin Russell | Attorney | Counsel for Largan Precision Co., Ltd.Search in Eureka ↗ |
| Plaintiff law firm | Russell & Woofter LLC | Law Firm | Representing Largan Precision Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Andrew M. Mason | Attorney | Counsel for Motorola Mobility, Inc.Search in Eureka ↗ |
| Defendant counsel | Frank MortonPark | Attorney | Counsel for Motorola Mobility, Inc.Search in Eureka ↗ |
| Defendant counsel | John D. Vandenberg | Attorney | Counsel for Motorola Mobility, Inc.Search in Eureka ↗ |
| Defendant counsel | Sarah Elisabeth Jelsema | Attorney | Counsel for Motorola Mobility, Inc.Search in Eureka ↗ |
| Defendant law firm | Klarquist Sarkman LLP | Law Firm | Representing Motorola Mobility, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The Federal Circuit’s order — ‘ORDERED and ADJUDGED: AFFIRMED’ — is a merits affirmance of the underlying unpatentability determination, not a procedural dismissal. At the Federal Circuit, appellate review of patentability rulings from the USPTO or PTAB applies a deferential standard to factual findings (substantial evidence) while reviewing legal conclusions de novo. The unambiguous ‘AFFIRMED’ language indicates the panel found the lower tribunal’s reasoning legally sufficient and factually supported across all grounds Largan raised. No remand was ordered, confirming this is a final disposition adverse to the patent holder.
US9784948B2 — Compact multi-element imaging lens system for mobile devices
US9784948B2, filed under application number US15/067369, protects an imaging lens system — a compact, multi-element optical assembly of the type used in smartphone and mobile device camera modules. Such patents typically define precise configurations of lens elements, their refractive index ranges, Abbe numbers, and positional relationships designed to deliver high resolution in a small form factor. Largan Precision, one of the world’s largest suppliers of smartphone camera lenses, has built a substantial enforcement portfolio around such designs.
Imaging lens patents of this type sit at the intersection of high-volume consumer electronics and precision optical engineering, making them commercially significant for OEM supply chains. Largan has historically used its patent portfolio to assert licensing obligations against competitors and smartphone manufacturers globally. The cancellation of US9784948B2 removes one enforcement asset but leaves intact Largan’s broader family of lens patents — meaning competitors cannot assume blanket freedom to operate across all similar optical architectures without a targeted FTO analysis.
Should you run an FTO analysis against US9784948B2 and related Largan patents?
Any company designing, manufacturing, or importing compact multi-element imaging lens systems for smartphones, tablets, or automotive cameras should treat this case as a trigger for a structured FTO review. US9784948B2 has been cancelled, but Largan’s portfolio includes numerous related patents covering overlapping lens element configurations. Product teams working on camera module specifications — particularly those targeting thin-form-factor designs — face ongoing exposure to surviving Largan claims that may share priority lineage with the cancelled patent.
PatSnap Eureka’s FTO Search Agent allows R&D and legal teams to map the full Largan imaging lens patent family, identify claims still in force, and assess whether current product designs fall within those claim boundaries. Eureka’s AI-assisted claim chart generation and prior art landscape tools help you build a defensible FTO position — not just for US9784948B2 but across the entire optical lens portfolio relevant to your product roadmap.
Run a freedom-to-operate analysis on US9784948B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit imaging lens patent appeal cases
Federal Circuit appeals involving imaging lens and optical system patents from mobile device manufacturers — comparable patentability challenges and affirmance outcomes.
What this case signals for the mobile imaging optics IP landscape
The Federal Circuit’s affirmance reshapes enforcement risk around compact imaging lens patents and raises questions about Largan’s broader portfolio strategy.
Unpatentability affirmances raise the bar for related Largan patent enforcement
When the Federal Circuit affirms an unpatentability finding, it signals that the claim architecture failed scrutiny at the highest appellate level. Competitors and licensees holding Largan imaging lens patents should reassess validity risk across the family — particularly patents sharing specification language or priority claims with US9784948B2.
Mobile OEMs should audit exposure to surviving Largan optical patents
Largan holds a substantial portfolio of imaging lens patents beyond US9784948B2. The cancellation of this patent does not eliminate the broader enforcement risk. R&D and product teams at smartphone and module manufacturers should conduct targeted FTO searches across Largan’s active US and international filings covering similar lens element configurations.
Largan v Motorola — key questions answered
The Federal Circuit affirmed the unpatentability of Largan Precision’s US9784948B2, an imaging lens system patent. The court’s order — ‘AFFIRMED’ — confirms the lower tribunal’s invalidity or cancellation finding stands, and the patent is extinguished. The case closed on 4 September 2025 after 547 days.
An affirmance at the Federal Circuit means the court found no reversible error in the unpatentability determination below. US9784948B2 is formally invalid or cancelled and cannot be enforced against any party. Largan’s options are limited to an en banc rehearing petition or a certiorari petition to the Supreme Court, both of which face a high bar.
Largan Precision’s patent at issue is US9784948B2, filed under application number US15/067369. The patent covers an imaging lens system — a compact, multi-element optical assembly used in smartphone camera modules. The underlying dispute was an invalidity or cancellation action brought by Motorola Mobility.
The Federal Circuit’s affirmance of unpatentability means Motorola Mobility and, effectively, any third party has freedom to operate with respect to the specific claim set of US9784948B2. The patent can no longer be enforced. However, Largan holds a broader imaging lens portfolio, so a comprehensive FTO analysis covering related patents remains advisable for any party active in this technology space.
Largan could petition the Federal Circuit for en banc rehearing, asking the full court to reconsider the panel decision. Alternatively, Largan could file a petition for a writ of certiorari to the U.S. Supreme Court. Both routes face significant hurdles — the Supreme Court accepts a small fraction of patent cases, and en banc rehearings are granted infrequently in straightforward patentability affirmances.
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