Typewriters for ciphering or deciphering cryptographic text

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: PHYSICS
Class:: EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
Subclass:: CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY

cryptographic TYPEWRITER(S)TYPEWRITER(S) for ciphering or deciphering cryptographic text

2 direct subcodes

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G09C 3/02 with auxiliary keys or keyboards acting on the original keys or keyboards
G09C 3/04 wherein the operative connections between the keys and the type-bars are automatically and continuously permuted, during operation, by a coding or key member

Top 10 applicants by patent filingsfor class G09, 2013–2023, worldwide · Source: EPO PATSTAT