Parker v. Flook
The Supreme Court holds that an invention which has no inventive concept other than the use of a mathematical algorithm is not patentable. The mathematical algorithm itself is treated as part of the prior art.
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Gottschalk v. Benson
The Supreme Court held that an invention claimed as a process that is (a) defined by an algorithm with no practical use except in the programmed manipulation of signals in a digital computer, and (b) not limited to a subset of possible applications, do not fall within the requirements of statutory subject matter under Section 101.