Inequitable Conduct and Unclean Hands: Is There a Difference and Does it Matter?

Inequitable conduct remains the most powerful defense to patent infringement. In contrast to other defenses to patent infringement that require a claim-by-claim analysis, the defense of inequitable conduct is global. A finding of inequitable conduct renders the entire patent unenforceable. For this reason, the U.S. Court of Appeals for the Federal Circuit has referred to the defense of inequitable conduct as the “atom bomb of patent law” Aventis Pharma S.A. v. Amphastar Pharmaceutical, Inc., 525 F.3d 1334, 1349 (Fed.Cir.2008). Given the tremendous impact of the inequitable conduct defense, the Federal Circuit, in Therasense, Inc. v. Becton, Dickinson and Co., 649 F. 3d 1276 (Fed. Cir., 2011), has significantly increased the burden on patent infringers who assert this defense. Rather than needing to prove materiality in the context of 37 C.F.R. § 1.56 and intent to deceive, Therasense now requires an infringer prove “but for” materiality and a specific intent to deceive—a much higher burden than before. To the disappointment of those who believed that Therasense would spell the demise of inequitable conduct, this defense to patent infringement remains alive and well, although less prevalent than before. See Energy Heating, LLC v. Heat On-The-Fly LLC, 889. F.3d 1291 (Fed. Cir. 2018). Moreover, the Federal Circuit, in Gilead Sciences, Inc. v. Merck & Co. 890 F.3d 1231(Fed. Cir 2018), now seems to recognize an equitable defense (“business misconduct”) separate from inequitable conduct to penalize patentees for unethical behavior committed outside of the confines of patent prosecution before the United States Patent and

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