3823378

Information

• Patent Grant
• 3823378

• References
• Source

• Patent Number

  3,823,378

• Date Filed

  Not available

• Date Issued

  Tuesday, July 9, 1974
  50 years ago

• CPC

  • G08C19/14 - using combination of fixed frequencies
  • H04L27/26 - Systems using multi-frequency codes

• US Classifications

  • 341 - Coded data generation or conversion
  • 331 - Oscillators
  • 340 - Communications: electrical