Infineon v. Arigna (23-1708): Federal Circuit Appeal Dismissed After 571 Days
Infineon Technologies AG and Arigna Technology Ltd. jointly agreed to dismiss their Federal Circuit appeal — Case No. 23-1708 — concerning the patentability of US8247867B2, a semiconductor device patent. The appeal, filed in April 2023, ended in October 2024 with each side bearing its own costs under Fed. R. App. P. 42(b).
A contested semiconductor patent appeal ends by mutual agreement
Infineon Technologies AG, the German semiconductor major, appealed a patentability decision involving US8247867B2 — a patent covering semiconductor device architecture — against Arigna Technology Ltd. at the Court of Appeals for the Federal Circuit (Case No. 23-1708). The appeal was filed on 6 April 2023, arising from an invalidity/cancellation action at the underlying proceeding. Fish & Richardson LLP represented Infineon; Heim, Payne & Chorush, LLP acted for Arigna.
The appeal was terminated on 28 October 2024 by a consent order dismissing the case under Fed. R. App. P. 42(b), with each party to bear its own costs. Rule 42(b) dismissals at the Federal Circuit require the parties’ agreement and the court’s approval; the absence of a cost award to either side suggests a negotiated resolution rather than a capitulation by one party. No merits ruling was issued, meaning the underlying patentability determination was not affirmed, reversed, or vacated by the Federal Circuit.
At 571 days, the appeal ran for nearly 16 months before resolution — consistent with a timeline in which briefing was substantially advanced or settlement negotiations were protracted before a mutual agreement was reached. The public record does not disclose whether a licensing arrangement, cross-licence, or other commercial deal accompanied the dismissal. The fate of the underlying invalidity/cancellation finding remains the operative legal status of US8247867B2, since no appellate merits decision was rendered.
Filing to Voluntary dismissal in 571 days
571 days from filing to dismissal — longer than the median Federal Circuit appeal resolution
Appeal dismissed by agreement: what FRAP 42(b) means for both parties
FRAP 42(b): a procedural exit with no merits ruling
Fed. R. App. P. 42(b) allows parties to dismiss an appeal by stipulation with court approval. Critically, the Federal Circuit issues no opinion on the underlying patentability question — the appeal simply ceases. This means neither party secured an appellate ruling validating or invalidating US8247867B2. The underlying PTAB or district court outcome, whatever it was, remains the last substantive word on the patent’s validity.
No merits adjudicationInfineon exits without an appellate win — or loss
As appellant, Infineon had sought reversal or vacatur of the underlying patentability ruling. By agreeing to dismiss under FRAP 42(b), Infineon forgoes any chance of an appellate ruling in its favour on US8247867B2. Whether this reflects a commercial settlement, a strategic portfolio decision, or changed business priorities is not discernible from the public record. The each-side-bears-costs structure suggests neither party extracted a financial concession on costs.
Appeal withdrawn by agreementArigna avoids a potential reversal — but no appellate validation either
Arigna Technology, as appellee defending the underlying invalidity/cancellation finding, avoids the risk that the Federal Circuit would have reversed or modified that outcome. However, Arigna also received no appellate endorsement of its position. The dismissal is neutral on the merits. For an IP licensing entity, the commercial calculus of settling versus obtaining a final appellate ruling likely drove the decision to agree to dismissal.
No appellate endorsement securedPatent’s enforceability status left unresolved at appellate level
Third parties assessing freedom to operate around US8247867B2 must look to the underlying proceeding outcome, not a Federal Circuit merits ruling, to understand the patent’s current validity status. The semiconductor device space sees frequent PTAB validity challenges; a FRAP 42(b) dismissal without merits ruling leaves commercial uncertainty intact. Competitors and licensees should conduct independent FTO analysis rather than relying on an appellate determination that was never made.
FTO analysis still requiredFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Infineon Technologies, AG | Company | Global semiconductor manufacturer — holder of US8247867B2 (semiconductor device)Search in Eureka ↗ |
| Defendant | Arigna Technology, Ltd. | Company | Arigna Technology Ltd. — IP licensing entity asserting invalidity/cancellation of the patentSearch in Eureka ↗ |
| Plaintiff counsel | David M. Hoffman Counsel | Attorney | Counsel for Infineon Technologies, AGSearch in Eureka ↗ |
| Plaintiff counsel | Kenneth Wayne Darby | Attorney | Counsel for Infineon Technologies, AGSearch in Eureka ↗ |
| Plaintiff counsel | Michael John Ballanco | Attorney | Counsel for Infineon Technologies, AGSearch in Eureka ↗ |
| Plaintiff counsel | Shawn Bastani | Attorney | Counsel for Infineon Technologies, AGSearch in Eureka ↗ |
| Plaintiff law firm | Fish & Richardson LLP | Law Firm | Representing Infineon Technologies, AGSearch in Eureka ↗ |
| Defendant counsel | Christopher Limbacher | Attorney | Counsel for Arigna Technology, Ltd.Search in Eureka ↗ |
| Defendant counsel | Michael F. Heim | Attorney | Counsel for Arigna Technology, Ltd.Search in Eureka ↗ |
| Defendant counsel | Russell Chorush | Attorney | Counsel for Arigna Technology, Ltd.Search in Eureka ↗ |
| Defendant law firm | Heim, Payne & Chorush, LLP | Law Firm | Representing Arigna Technology, Ltd.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Court of Appeals for the Federal CircuitSearch in Eureka ↗ |
Official order — verbatim text
The dismissal order is minimalist by design: it records the parties’ agreement, invokes FRAP 42(b), and imposes no cost award. The absence of any merits language means the Federal Circuit expressed no view on the patentability of US8247867B2. For practitioners, the operative question is the precedential weight — or lack thereof — of the underlying invalidity/cancellation decision, which now stands unchallenged at the appellate level. The neutral cost allocation is consistent with a negotiated resolution rather than a default or abandonment.
US8247867B2 — semiconductor device integrated circuit patent
US8247867B2, filed under application number US12/836922, covers semiconductor device technology — a domain central to integrated circuit design and manufacture. The patent’s claims are directed to structural or functional aspects of semiconductor devices, placing it squarely within the competitive core of the global chip industry. Its patentability was formally contested via an invalidity/cancellation action, reflecting the high-stakes nature of foundational semiconductor IP in the current litigation environment.
For a company of Infineon’s scale — a top-ten global semiconductor supplier — patents covering device architecture carry significant defensive and offensive value. An invalidity challenge by an IP licensing entity such as Arigna Technology signals that the claims of US8247867B2 were viewed as commercially significant enough to contest, and that third parties perceived potential exposure or licensing leverage. The unresolved appellate posture means the patent’s enforceability remains a live commercial question for the semiconductor industry.
Should you run an FTO analysis against US8247867B2?
Any company designing, manufacturing, or commercialising semiconductor devices — including integrated circuit foundries, fabless chip designers, and automotive semiconductor suppliers — should assess exposure to US8247867B2. The appeal’s dismissal without a merits ruling means there is no Federal Circuit precedent clarifying the patent’s claim scope or validity. R&D and product teams working on device architectures covered by this patent family cannot rely on the dismissal as a clearance event.
PatSnap Eureka’s FTO Search Agent enables IP and engineering teams to map claim language from US8247867B2 against current product architectures, identify prior art cited in the underlying invalidity proceeding, and surface related family members or continuation patents that may carry similar claims. Given the unresolved validity status and the involvement of an IP licensing entity, a structured FTO review is a prudent step before committing to product designs in this space.
Run a freedom-to-operate analysis on US8247867B2 to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit semiconductor patent invalidity appeals
Related Federal Circuit appeals involving semiconductor device patent invalidity and cancellation actions, including comparable FRAP 42(b) dispositions and PTAB-originating disputes.
What this case signals for the semiconductor patent IP landscape
A Federal Circuit appeal dismissed by stipulation in a semiconductor invalidity dispute carries distinct signals for patent holders and challengers alike.
FRAP 42(b) dismissals leave underlying validity status as the operative record
When a Federal Circuit appeal ends under Rule 42(b), the last substantive ruling — typically a PTAB final written decision or district court judgment — governs. IP teams monitoring US8247867B2 or structuring licences around semiconductor device patents should anchor their analysis to that underlying record, not assume the dismissal is a clean slate for either party.
Each-side-bears-costs orders signal negotiated exits, not unilateral capitulation
A mutual cost-bearing dismissal at the Federal Circuit level typically suggests the parties reached a negotiated resolution — whether commercial, licensing-based, or strategic — rather than one side simply giving up. For in-house IP teams, this pattern suggests that monitoring settlement signals in advanced-stage Federal Circuit appeals can surface licensing opportunities or litigation risk earlier than waiting for a merits ruling.
Infineon v Arigna — key questions answered
The dismissal under Fed. R. App. P. 42(b) means the Federal Circuit issued no merits ruling on the patentability of US8247867B2. The underlying invalidity/cancellation decision from the lower proceeding remains the operative legal status of the patent. Neither party obtained appellate validation of their position.
Infineon Technologies AG is a major German semiconductor manufacturer and the appellant in Case No. 23-1708. Arigna Technology Ltd. is an IP licensing entity that was the appellee, having succeeded in an invalidity/cancellation action against US8247867B2 at the underlying level. Fish & Richardson represented Infineon; Heim, Payne & Chorush acted for Arigna.
The public record does not disclose the commercial terms behind the FRAP 42(b) dismissal. A mutual cost-bearing structure typically suggests the parties reached a negotiated resolution — potentially including a licence, covenant not to sue, or commercial settlement — rather than one party simply abandoning its position. The 571-day duration suggests briefing was advanced before agreement was reached.
Because the Federal Circuit dismissed the appeal without issuing a merits ruling, the last substantive determination on the patentability of US8247867B2 comes from the underlying invalidity/cancellation proceeding. That decision was not overturned or affirmed at appellate level. Parties assessing FTO or licensing exposure should review the underlying PTAB or district court record directly.
Case No. 23-1708 ran for 571 days from filing (6 April 2023) to closure (28 October 2024). This is longer than the median Federal Circuit appeal and is consistent with a case where briefing was substantially complete — or parallel settlement negotiations were protracted — before the parties agreed to a stipulated dismissal under FRAP 42(b).
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