Does Prior Art Lose Significance with Time?

In Leo Pharmaceutical Products, Ltd. v. Rea (Fed. Cir. Aug. 12, 2013), the Federal Circuit by Judge Rader, with Judges O’Malley and Reyna, found Patent No. 6,753,013 non-obvious, reversing a decision by the Board of Patent Appeals and Interferences.  Significantly, the opinion implies that prior art loses its significance for obviousness determinations with time. The…