Written by Mark Terry In an educational decision yesterday, the Board of Patent Appeals and Interferences decided in Ex Parte Nakamura that an already-existing, but unacknowledged, characteristic in a prior art composition is obvious under 35 U.S.C. 103(a) but rebuttable if there is evidence to the contrary. As a patent attorney in Florida with an active patent prosecution docket, I’m always on the lookout for decisions of the BPAI that divulge methods for fighting rejections. In this case, the Appellant claimed a composition of nickel and tin that has a characteristic of preventing copper from diffusing. The problem was that the Examiner found a