( September 4, 2026, 10:18 AM EDT) -- WASHINGTON, D.C. — A Federal Circuit U.S. Court of Appeals panel affirmed a determination from the U.S. Patent Trial and Appeal Board (PTAB) that certain claims of a patent describing a vitamin D treatment held by a couple were unpatentable as obvious, determining that substantial evidence supported PTAB’s underlying prior art factual findings and that the couple failed to properly develop certain theories before the board....