In re Christensen

Citation: In re Christensen, 478 F.2d 1392, 178 U.S.P.Q. (BNA) 35 (C.C.P.A. 1973).

A method claim, in which the point of novelty was a mathematical equation to be solved as the final step of the method, was held nonstatutory subject matter. The addition of the "steps" of establishing values for the variables in the equation cannot convert an unpatentable method to patentable subject matter.