3927266

Information

• Patent Grant
• 3927266

• References
• Source

• Patent Number

  3,927,266

• Date Filed

  Not available

• Date Issued

  Tuesday, December 16, 1975
  49 years ago

• CPC

  • H04Q5/245 - Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal
  • H04M7/16 - in systems employing carrier frequencies
  • H04M19/04 - ringing-current generated at substation

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications