In Guardant Health, Inc. v. Foundation Medicine, Inc., 1-17-cv-01616 (DDE 2020-01-07, Order), the Court rejected the Plaintiff’s argument that an inequitable conduct claim must be related only to the prosecution of the patent-at-issue in ruling on plaintiff’s motion to dismiss defendants’ infectious unenforceability counterclaims. In the case, the Defendants’ theory as to the unenforceability of U.S. Patent No. 9,902,992 (the ’992 patent) was not based on inequitable conduct said to have occurred during the ’992 patent’s prosecution. Instead, it rested on the relationship between the ’992 patent and the prosecution of other related patents.
As some background, inequitable conduct regarding any single claim in the prosecution of a patent renders the entire patent unenforceable, not just that specific claim. Moreover, a finding of inequitable conduct can affect not just the improperly-prosecuted patent, but can also render unenforceable any other related patents and applications in the same patent family. This concept is what courts have referred to as the doctrine of “infectious unenforceability.”
Continue Reading Inequitable Conduct Can Render all Patents in a Patent Family Unenforceable through Infectious Unenforceability
