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The basic principle of this kind of transistorwas first patented by Julius Edgar Lilienfeld in 1925 Twenty five years later when Bell Telephone attempted to patent the junction transistor they found Lilienfeld already holding a patent worded in a way that would include all types of transistors Bell Labs was able to work out an agreement with Lilienfeld who was still alive at that time (it is not known if they paid him money or not) It was at that time the Bell Labs version was given the name bipolar junction transistor or simply junction transistor and Lilienfeld s design took the name field effect transistor In 1959 Dawon Kahng and Martin M (John) Atalla at Bell Labs invented the metal oxide semiconductor field effect transistor (MOSFET) as an offshoot to the patented FET design