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In its calender marking events in tech history Wired has today as the day of the first US software patent.(US4270182). The patent was filed in 1974 by a programmer-slash-patent attorney wanting to challenge the US patent system. He even published a book on the case afterwards. The patent was issued the same year as the famous Supreme Court case Diamond vs. Diehr. Actually the Diamond case was decided in march as the patent was granted in may…probably not a coincidence.