CAFC Affirms PTAB Ruling in Pfizer-Sanofi Patent Dispute

The U.S. Court of Appeals for the Federal Circuit affirmed a Patent Trial and Appeal Board decision denying Pfizer’s motions to amend two patent claims in a dispute with Sanofi Pasteur.

The ruling marks the second appeal in the case, following a prior CAFC decision that partially vacated and remanded an earlier PTAB outcome.

The matter centers on patent validity issues in pharmaceutical technology. No trademark elements were addressed in the decision.

Sources: https://ipwatchdog.com/2026/08/02/cafc-affirms-ptab-denial-of-motions-to-amend-remaining-pfizer-claims-invalidated-by-sanofi/ https://ipwatchdog.com/