HOME  |  CONTACT US  |  SUBSCRIBE  |  SUPPORT WLF

Case Detail


Regeneron Pharmaceuticals, Inc. v. Merus N.V.
On July 9, 2018, WLF filed a brief in the U.S. Supreme Court, urging it to review (and overturn) an appeals court decision that substantially expands the “inequitable conduct” defense and thereby throws into question the continued viability of numerous patents. WLF’s brief argued that the inequitable-conduct doctrine is being invoked far too frequently to strike down patents for relatively trivial errors. WLF asserted that patents should never be invalidated on inequitable-conduct grounds in the absence of “clear and convincing” evidence that the patentee withheld documents from its patent application with “intent to deceive” the Patent and Trademark Office. The alleged infringer presented no such evidence in this case because the trial judge used her sanctioning power as a substitute for a trial on the merits: she ruled that the patentee’s counsel engaged in misconduct during trial and, as a sanction, declared the patentee guilty of inequitable conduct.
Case Status:
Awaiting Decision
More Information and Downloads:
7/10/2018: Download the Brief
9/26/2017: Download the Brief


  • Welcome to the Washington Legal Foundation
  • 2009 Massachusetts Ave., NW
    Washington, DC 20036
  • info@wlf.org  |  ph. 202-588-0302
    ©2018 WLF All Rights Reserved