This dispute arose from a patent infringement lawsuit involving dual-color interlocking floor mats. Parallax Group International, LLC owned two patents, the '085 and D764 patents, and sued Incstores LLC for infringement. Incstores countered by challenging the validity of the patents and alleging that Parallax committed inequitable conduct during the patent prosecution process. Specifically, Incstores claimed that Parallax's counsel failed to disclose certain prior art references when filing a preliminary amendment, suggesting an intent to deceive the Patent Office. After a complex procedural history including summary judgments on validity and ex parte reexaminations at the Patent Office, the district court entered judgment for Incstores on invalidity grounds. However, the district court subsequently held a bench trial on the inequitable conduct claim and denied Incstores's motion for attorney's fees, finding that Parallax did not act with specific intent to deceive and that the case was not exceptional. Incstores appealed this denial of fees.
The Federal Circuit, in a per curiam opinion by Circuit Judge Chen, reviewed the district court's findings for clear error, a highly deferential standard. The court addressed two primary issues: inequitable conduct and the exceptional case standard. First, regarding inequitable conduct, the court noted that the district court credibly found that Parallax's counsel did not have the specific intent to deceive. The counsel testified he was unaware of the prior art references at the time of filing and later did not disclose them because he did not consider them material to the novelty of the design patents. The court supported this finding by noting that the Patent Office ultimately relied on a different reference to reject the claims during reexamination, which reasonably supported the counsel's view that the undisclosed references were not material. Second, regarding the exceptional case standard, Incstores argued that Parallax took contradictory positions regarding the '085 patent's validity and infringement. The court rejected this, observing that the discrepancies were between the layman inventor's testimony and the legal interpretations in the patent specification. The court cited precedent stating that an exceptional case must stand out regarding the substantive strength of a party's position or the unreasonable manner of litigation. The court concluded that minor differences between an inventor's understanding and their counsel's legal drafting do not meet this high bar.
The decision affirms that patent applicants are not automatically subject to fee-shifting or inequitable conduct findings based on minor inconsistencies between inventor testimony and patent disclosures. It clarifies that the 'exceptional case' standard for attorney's fees remains a high bar, requiring evidence of unreasonable litigation conduct or a substantive weakness in a party's position that stands out from the norm. The case is remanded to the district court with instructions to enter judgment consistent with the Federal Circuit's affirmation, meaning Incstores remains responsible for its own legal costs.
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