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In page Silicon Valley:

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Following the 1959 inventions of the monolithic integrated circuit (IC) chip by Robert Noyce at Fairchild, the first commercial MOS IC was introduced by General Microelectronics in 1964.[7] The first single-chip microprocessor was the Intel 4004,[8] designed and realized by Federico Faggin along with Ted Hoff, Masatoshi Shima and Stanley Mazor at Intel in 1971.[9][10] In April 1974, Intel released the Intel 8080,[11] a "computer on a chip", "the first truly usable microprocessor"[citation needed].