Landmark Supreme Court cases that shaped software patents.

GOTTSCHALK v. BENSON, 409 U.S. 63 (1972) - algorithms cannot be patented.

PARKER v. FLOOK, 437 U.S. 584 (1978) - novelty of an algorithm (process) resides in the implementation.

DIAMOND v. DIEHR, 450 U.S. 175 (1981) - physical process controlled by software is patentable.

BILSKI ET AL. v. KAPPOS No. 08-964 (2010) - abstract (business) method (including software) not patentable.