Fantasia Trading v. CogniPower: Federal Circuit Affirms Power Converter Patent
Fantasia Trading, LLC challenged the validity of CogniPower LLC’s reissued patent USRE047713E covering demand pulse isolation power converter technology. The Federal Circuit affirmed the patent’s validity after 576 days of appellate proceedings, leaving CogniPower’s IP position intact and the invalidity challenge fully exhausted at this level.
Federal Circuit closes Fantasia Trading’s invalidity attack on CogniPower power converter patent
Fantasia Trading, LLC filed Case No. 22-2010 at the Court of Appeals for the Federal Circuit on 13 July 2022, appealing a prior ruling in an invalidity and cancellation action targeting CogniPower LLC’s reissued patent USRE047713E. The patent — a reissue of application US15/168998 — covers a power converter with demand pulse isolation, a switching-architecture technology relevant to power supply design in consumer electronics and broader electrical systems. CogniPower, as the patent holder, defended the validity of its reissued patent throughout the proceeding.
The Federal Circuit issued its judgment on 9 February 2024, ordering the case AFFIRMED. The basis of termination is recorded as ‘Patent Upheld,’ confirming that the lower tribunal’s determination of patentability survived appellate scrutiny. For CogniPower, the affirmance means the patent remains enforceable as issued. For Fantasia Trading, the appellate avenue at the Federal Circuit is now exhausted at this stage, with the invalidity arguments having failed to persuade the court of reversible error.
The 576-day duration suggests the appeal involved substantive briefing and review rather than early procedural resolution — consistent with a patentability dispute over a reissued patent, which typically raises questions about whether the reissue claims improperly broadened the original grant. What specific claim construction or prior art arguments Fantasia Trading advanced remains outside the public record captured here. The affirmance leaves open the question of whether further challenge — for instance, via inter partes review at the USPTO — remains strategically viable for Fantasia Trading or similarly situated competitors.
Filing to Patent Upheld in 576 days
576 days — longer than the median Federal Circuit appeal, which typically resolves in 12–18 months
Federal Circuit affirms: what the ruling means for both parties
Affirmance means no reversible error was found below
When the Federal Circuit issues an AFFIRMED judgment, it is ruling that the lower tribunal committed no reversible error in its patentability determination. The court does not re-try the facts but reviews legal conclusions de novo and factual findings for clear error. An affirmance is not a finding that the patent is unassailable — it means Fantasia Trading failed to demonstrate that the decision below was legally or factually erroneous under the applicable appellate standard.
Appellate standard satisfiedCogniPower’s reissued patent survives and retains full enforceability
For CogniPower, the Federal Circuit’s affirmance is a significant enforcement win. USRE047713E — covering demand pulse isolation power converter architecture — now carries the weight of appellate validation. The patent can continue to be asserted against third parties, and the affirmance strengthens CogniPower’s negotiating position in licensing discussions. Competitors considering design-around strategies must now treat the affirmed claims as a higher-risk boundary.
Patent enforceable, challenge defeatedFantasia Trading’s invalidity arguments are exhausted at Federal Circuit level
Fantasia Trading has no further recourse at the Federal Circuit following an affirmance. Potential next steps — petition for rehearing en banc or certiorari to the Supreme Court — face extremely high thresholds and are rarely granted in patent validity disputes. If Fantasia Trading seeks to continue challenging the patent, a separate inter partes review petition at the USPTO on different grounds may represent the only remaining viable avenue, subject to estoppel considerations from the current proceeding.
Federal Circuit avenue closedPower converter sector faces strengthened IP barrier from affirmed reissued patent
An affirmed reissued patent is a particularly strong IP asset — it has survived both the USPTO reissue examination process and an invalidity challenge through appeal. Companies developing switched-mode power supply products, demand pulse isolation circuits, or related power converter architectures should treat USRE047713E as an elevated freedom-to-operate risk. The affirmance raises the evidentiary bar for any future invalidity challenge and signals that the claim scope has withstood adversarial scrutiny at the highest patent appellate level.
Elevated FTO risk for power electronics sectorFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Fantasia Trading, LLC | Company | Invalidity challenger — appellant seeking cancellation of USRE047713E power converter patentSearch in Eureka ↗ |
| Defendant | CogniPower, LLC | Company | CogniPower, LLC — holder of USRE047713E, power converter demand pulse isolation technologySearch in Eureka ↗ |
| Plaintiff counsel | Brian P. Boyd | Attorney | Counsel for Fantasia Trading, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Fish & Richardson LLP | Law Firm | Representing Fantasia Trading, LLCSearch in Eureka ↗ |
| Defendant counsel | Jonathan M. Lindsay | Attorney | Counsel for CogniPower, LLCSearch in Eureka ↗ |
| Defendant law firm | Irell & Manella, LLP | Law Firm | Representing CogniPower, LLCSearch 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 — ‘THIS CAUSE having been heard and considered, it is ORDERED and ADJUDGED: AFFIRMED’ — is a final appellate judgment on the patentability of USRE047713E. The court reviewed the invalidity and cancellation action under its standard appellate framework: legal conclusions de novo, factual findings for clear error. The terse affirmance language is characteristic of Federal Circuit practice and does not diminish the ruling’s finality. For CogniPower, the judgment conclusively establishes that the patent withstood adversarial invalidity challenge at the appellate level. For Fantasia Trading, no merits relief was obtained.
USRE047713E — Power Converter with Demand Pulse Isolation
USRE047713E is a reissued United States patent, reissued from application US15/168998, covering a power converter with demand pulse isolation. Reissued patents undergo a second examination at the USPTO, during which the claims may be corrected or adjusted — but not impermissibly broadened — relative to the original grant. The demand pulse isolation architecture addresses how power converters regulate energy transfer using pulse signals, a technically significant design space in switched-mode power supplies used across consumer electronics, industrial systems, and battery management applications.
The strategic significance of USRE047713E lies in its dual validation: it survived reissue examination and, as of February 2024, a Federal Circuit invalidity appeal. For competitors in the power converter and power management IC sectors, the patent represents a meaningful claim boundary around demand pulse isolation techniques. Companies designing controllers, adapters, chargers, or power modules that employ pulse-based demand signalling should conduct targeted FTO analysis against the affirmed claims, particularly given the elevated litigation risk that follows appellate validation.
Should your power electronics team run an FTO against USRE047713E?
Any R&D team or product manager working on switched-mode power converters, adaptive chargers, or demand-side pulse isolation circuits should treat USRE047713E as a priority FTO target following the Federal Circuit’s February 2024 affirmance. The patent’s reissued status and appellate validation mean that claim scope has been tested — making it harder to dismiss as a litigation risk. Consumer electronics OEMs, power semiconductor companies, and their contract manufacturers are all potentially in scope.
PatSnap Eureka’s FTO Search Agent can map your product’s technical architecture against the affirmed claims of USRE047713E, surface related CogniPower patent family members, and identify prior art that may support a differentiated design-around strategy. The agent also flags prosecution history estoppel markers that narrow or define claim boundaries — critical intelligence for engineering teams assessing how much design margin exists around the demand pulse isolation technique.
Run a freedom-to-operate analysis on USRE047713E to assess your product’s exposure
Run FTO in Eureka →Similar Federal Circuit patent validity appeals in power electronics
Cases involving Federal Circuit invalidity appeals of reissued power converter patents, including switched-mode power supply and pulse isolation technology disputes.
What this case signals for the power electronics IP landscape
An affirmed reissued patent in a demand pulse isolation dispute sets a precedent that should prompt immediate FTO review across the power converter supply chain.
Reissued patents that survive appeal carry compounded enforcement weight
USRE047713E has now cleared both USPTO reissue scrutiny and a Federal Circuit invalidity appeal. For power electronics companies, this double validation typically signals higher litigation risk if products operate in the demand pulse isolation space. IP counsel should revisit FTO opinions issued before the affirmance date of February 2024.
Fantasia Trading’s challenge exhaustion may open licensing pressure
With the Federal Circuit avenue closed, CogniPower is positioned to pursue licensing or enforcement against other market participants from a position of appellate-validated strength. Companies in the switched-mode power supply sector should anticipate increased licensing outreach and evaluate their design-around options before receiving a demand letter.
Fantasia v CogniPower — key questions answered
The Federal Circuit affirmed the lower tribunal’s ruling, upholding the validity of CogniPower’s reissued patent USRE047713E covering a power converter with demand pulse isolation. The judgment, issued on 9 February 2024, terminates Fantasia Trading’s invalidity challenge at the appellate level.
USRE047713E is a reissued US patent covering a power converter with demand pulse isolation — a technique used in switched-mode power supply design to regulate energy transfer via pulse-based demand signalling. It was challenged by Fantasia Trading in an invalidity and cancellation action, asserting the patent should not have been granted or reissued.
An affirmance from the Federal Circuit means the patent’s validity was upheld on appeal, with the court finding no reversible error in the prior patentability determination. For CogniPower, this strengthens its enforcement and licensing position — the patent now carries appellate validation, which typically deters future challenges and supports higher licensing valuations.
Fantasia Trading’s options at the Federal Circuit are exhausted following affirmance. Theoretically, it could petition for en banc rehearing or Supreme Court certiorari, but both face extremely high thresholds. A separate inter partes review at the USPTO may be possible on grounds not previously raised, subject to estoppel analysis from the current proceeding.
Fantasia Trading, LLC was represented by Brian P. Boyd of Fish & Richardson LLP. CogniPower, LLC was represented by Jonathan M. Lindsay of Irell & Manella, LLP. Both firms are nationally recognised in patent litigation at the Federal Circuit level.
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