Friedrich Sass (6 January 1883 – 26 February 1968) was a German engineer, university professor and historian.
Friedrich Sass was born in Koldenbüttel and attended the Gymnasium (grammar school) in Schleswig.
After graduating from TU Berlin, Sass worked as a steam turbine designer at AEG from 1908.
[3] From 1927, Sass had been an untenured professor at TU Berlin, where he gave a lecture on direct-injected Diesel engines.
[1] On 2 April 1935, Sass obtained a patent on "Regulation means for internal combustion engines with injection without air and variable speed" US 1996710 that he had filed on 28 August 1929; [4] it has four claims.