• All sections
• G - Physics
• G09C - Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy
• G09C 1/04 - Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system with sign carriers or indicators moved relative to one another to positions determined by a permutation code or key, so as to indicate the appropriate corresponding clear or ciphered text

Patent holdings for IPC class G09C 1/04

Total number of patents in this class: 17

10-year publication summary

Principal owners for this class