Diehr devised a computerized process for curing rubber that was based on a well-known mathematical formula related to the cure time, and he devised numerous other steps in his synthetic rubber-curing process. The patent examiner determined that because abstract ideas, the laws of nature, and mathematical formulas are not patentable subject matter, the process in this case (based on a known mathematical formula) was also not patentable. Diehr contended that all of the steps in his rubber-curing process were new and not obvious to the art of rubber curing. He contended also that he did not seek an exclusive patent on the mathematical formula, except for its use in the rubbercuring process. Decide. [Diamond v Diehr, 450 US 175]