Jack Kilby of Texas Instruments and Robert Noyce of Fairchild Semiconductor, both invented the integrated circuit independently, at about the same time. Kilby's initial ideas were recorded, these concerned the integrated circuit in July 1958 and he demonstrated the first working integrated circuit by September 12, 1958. In 2000 the Nobel Prize in Physics was won by Kilby for his part in the invention of the integrated circuit. Robert Noyce also conjured up his own idea of an integrated circuit, approximately half a year later than that of Kilby. Noyce's chip was superior as it had solved many of the vast practical problems that the microchip, developed by Kilby had not. At Fairchild, Noyce's chip was made of silicon, more versatile than Kilby's germanium chip.
1949 saw the first early developments of the integrated circuit, a German engineer Werner Jacobi (of Siemens AG) filed a patent for an integrated-circuit-like semiconductor amplifying device, this showed five transistors on a common substrate, which were arranged in a 3-stage amplifier arrangement. Jacobi ideas were designed in order to contribute to small and cheap hearing aids as typical industrial applications of his patent yet a commercial use of his patent has not been reported
Later on the integrated circuit was later was also conceived by Geoffrey W.A. Dummer whilst working for the Royal Radar Establishment of the British Ministry of Defence. It was published on May 7, 1952 in Washington, D.C. but Dummer, was unsuccessfully attempted to build the circuit idea in 1956.