3778557

Information

• Patent Grant
• 3778557

• References
• Source

• Patent Number

  3,778,557

• Date Filed

  Not available

• Date Issued

  Tuesday, December 11, 1973
  51 years ago

• CPC

  • H04M1/505 - signals generated in digital form
  • H04Q5/08 - Signalling by continuous ac

• US Classifications

  • 341 - Coded data generation or conversion
  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
  • 379 - Telephonic communications