( September 4, 2026, 8:17 AM EDT) -- WASHINGTON, D.C. — A Federal Circuit U.S. Court of Appeals panel vacated a finding of obviousness from the U.S. Patent Trial and Appeal Board (PTAB) in a dispute over a dental tool patent, finding that a prior art reference cannot be considered to have a provisional application’s filing date merely by satisfying procedural priority requirements; the application must provide written-description support for at least one published claim....