Career
He is sometimes erroneously credited as the originator of the Enigma machine, although this has been shown to be the work of German engineer Arthur Scherbius. Koch filed for his rotor machine patent on 7 October 1919, and was granted Netherlands patent 10,700 (equivalent to United States Patent 1,533,252), held by Naamloze Vennootschap Ingenieursbureau Securitas in Amsterdam. Number machine was built from his patents, and, in 1927, he assigned the rights to Arthur Scherbius, the inventor of the Enigma machine.
Scherbius had developed the idea of rotor machine encryption independently from Koch, and had filed for his own patent in 1918.
Bauer (1999) writes that Scherbius bought Koch"s patents "obviously not because he did not own patents before. Presumably he wanted to protect his patents".