First Patent for a Turbo-jet Filed by Frank Whittle, 16.03.30
Frank Whittle filed this, the first ever patent for a gas turbine to propel an aircraft directly by its exhaust gas on 16th January 1930, when age 22 and a Flying Instructor in the RAF.
It shows the air passing through a single- stage axial-flow turbine, then a centrifugal compressor, before entering a number of radially-arranged combustion chambers and exhausting through a 2 stage axial-flow turbine on the same shaft as the compressor. Modern small gas turbines follow a similar layout.
Once granted, the patent was published but lapsed when Whittle could not afford the renewal fee of £5.