( March 30, 2026, 11:09 AM EDT) -- WASHINGTON, D.C. — A Federal Circuit U.S. Court of Appeals panel affirmed a final written decision by the U.S. Patent Trial and Appeal Board (PTAB) that multiple claims of an inventor’s patent describing a system for filtering electronic messages are unpatentable as obvious, finding substantial evidence to support a finding that a prior art system teaches relevant claim limitations....