3250020

Information

• Patent Grant
• 3250020

• References
• Source

• Patent Number

  3,250,020

• Date Filed

  Not available

• Date Issued

  Tuesday, May 10, 1966
  58 years ago

• CPC

  • G09C1/04 - 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

• US Classifications

  • 380 - Cryptography
  • 040 - Card, picture, or sign exhibiting