2949507

Information

• Patent Grant
• 2949507

• References
• Source

• Patent Number

  2,949,507

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1960
  64 years ago

• CPC

  • H04M19/04 - ringing-current generated at substation
  • H04Q1/4423 - using one signalling frequency

• US Classifications

  • 379 - Telephonic communications
  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems