This Day in History: March 4

Today: December 2, 2016
An Wang Sells Core Memory Patent to IBM

March 4, 1956

An Wang Sells Core Memory Patent to IBM

An Wang sells his patent for ferrite core memory to IBM for $500,000. One of the most important inventions in computer history, ferrite core memory was widely used in digital computers from the mid-1950s until the mid-1970s. The US Patent Office awarded Wang the patent for what he called a pulse transfer controlling device in 1949. Jay Forrester at MIT is considered the inventor of core memory.