Background
Freshub, Inc. holds patents on voice-processing technology — systems that allow users to interact with services by speaking commands, such as adding items to a grocery list by saying product names aloud. Freshub’s patents trace their priority through a chain of earlier applications held by its parent company, Ikan Holdings LLC. One of those earlier applications had lapsed — gone abandoned — due to missed fees, and was subsequently revived by Ikan through a petition to the USPTO claiming that the abandonment was unintentional.
Freshub sued Amazon in the Western District of Texas, asserting infringement of its voice-processing patents against Amazon’s Alexa-enabled services. Amazon denied infringement and raised inequitable conduct as a defense — arguing that Ikan’s revival petition to the USPTO had contained a false statement (that the abandonment was unintentional) made with specific intent to deceive the PTO. A jury found that Amazon did not infringe the asserted claims, and the district court also rejected Amazon’s inequitable conduct defense. Amazon appealed; Freshub cross-appealed on the non-infringement verdict.
The Court’s Holding
The Federal Circuit affirmed across all issues. On inequitable conduct, the court reiterated the demanding standard set by Therasense, Inc. v. Becton: to establish inequitable conduct, a challenger must prove by clear and convincing evidence both (1) that a misrepresentation or omission was made to the PTO and was material, and (2) that the person making it did so with the specific intent to deceive the PTO — not merely that they were negligent or mistaken. The court found that Amazon failed to meet this high burden on the specific intent element: the evidence showed at most that Ikan’s counsel may have been careless about the circumstances of the abandonment, but not that they made a knowingly false statement to deceive the USPTO.
The Federal Circuit affirmed the non-infringement verdict on separate grounds, finding that the jury had sufficient evidence to conclude that Amazon’s Alexa system did not practice the asserted claims as construed. The case serves as an important reminder that inequitable conduct — once called “the plague of patent litigation” — remains extremely difficult to prove under the Therasense standard, requiring a finding of subjective deceptive intent that goes well beyond mere mistakes or poor judgment during prosecution.
Key Takeaways
- Proving inequitable conduct requires clear and convincing evidence of specific intent to deceive the USPTO — negligence, carelessness, or even gross negligence during prosecution is not sufficient.
- Revival petitions that contain statements about “unintentional” abandonment must be accurate and well-supported; but incorrect statements alone, without proof of deceptive intent, will not result in an inequitable conduct finding.
- The Therasense standard significantly constrains inequitable conduct as a litigation defense — defendants who raise it must invest in evidence of the prosecuting attorney’s subjective state of mind, not merely point to factual inaccuracies in prosecution filings.
- Voice recognition and AI-adjacent technology patents remain valuable and actively litigated, with infringement turning critically on precise claim construction of technical terms.
Why It Matters
Inequitable conduct was once raised as a defense in nearly every major patent case, but the Federal Circuit’s 2011 Therasense decision raised the evidentiary bar dramatically by requiring proof of both but-for materiality and specific deceptive intent. Freshub v. Amazon reaffirms that those standards remain robust: broad attacks on prosecution conduct that fall short of proving subjective intent to deceive will fail. For defendants facing inequitable conduct opportunities, the case underscores the need to find concrete evidence of deliberate choice — not just sloppy prosecution — before committing resources to that defense at trial.
The case also highlights the risk profile of patents whose priority chains involve lapsed and revived applications. While revived applications can be perfectly valid, challengers will scrutinize the revival petition’s representations and the circumstances of the abandonment. Patent owners who need to revive an abandoned application should ensure that the revival petition is accurate and well-documented, as any ambiguity in that record may become a point of attack in later litigation.