News & Analysis as of

Patents Materiality

Wilson Sonsini Goodrich & Rosati

Inventor’s Failure to Provide Material Information to the USPTO Results in an Unenforceable Patent

On August 20, 2025, the U.S. District Court for the District of Delaware (court) found inequitable conduct when Applicant, Lindis Biotech, GMBH (Lindis), relied on data from hastily performed experiments to obtain a patent...more

Baker Botts L.L.P.

Avoiding Demurrer: Properly Pleading Inequitable Conduct

Baker Botts L.L.P. on

Properly pleading inequitable conduct claims is a challenge, a challenge that can be met with early due diligence and attention to detail in your pleading....more

Foley & Lardner LLP

Federal Circuit Finds Regeneron Transgenic Mouse Patent Invalid For Inequitable Conduct With Intent Inferred From Litigation...

Foley & Lardner LLP on

In a 38 page decision with a 19 page dissent by Judge Newman, the Federal Circuit determined that Regeneron’s transgenic mouse patent is unenforceable due to inequitable conduct. The decision was rendered in Regeneron...more

Schwabe, Williamson & Wyatt PC

Fresh From the Bench: Precedential Patent Cases From the Federal Circuit

In Regeneron v. Merus, a divided panel affirms a determination of unenforceability for violation of the duty of disclosure. What is interesting about the case is that neither the district court nor the majority reviewed...more

McDonnell Boehnen Hulbert & Berghoff LLP

USPTO Proposes Revisions to Materiality Standard

On October 28, the U.S. Patent and Trademark Office published a notice of proposed rulemaking in the Federal Register (81 Fed. Reg. 9451), proposing revisions to the materiality standard for the duty to disclose information...more

McDermott Will & Emery

Post-Therasense: Federal Circuit Divided on Inequitable Conduct

McDermott Will & Emery on

Am. Calcar, Inc. v. Am. Honda Motor Co., Inc. - In a post-Therasense decision, addressing the issue of inequitable conduct the U.S. Court of Appeals for the Federal Circuit upheld a district court’s finding that the...more

Sheppard Mullin Richter & Hampton LLP

Federal Circuit Affirms Inequitable Conduct Determination Under Therasense “But For” Exception and Reaffirms Significance of Rohm...

Today, the Federal Circuit upheld the District Court’s inequitable conduct verdict based on the submission of false affidavits to the United States Patent & Trademark Office (“PTO”). Intellect Wireless, Inc. v. HTC Corp.,...more

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