3387094

Information

• Patent Grant
• 3387094

• References
• Source

• Patent Number

  3,387,094

• Date Filed

  Not available

• Date Issued

  Tuesday, June 4, 1968
  56 years ago

• CPC

  • H04M3/08 - Indicating faults in circuits or apparatus
  • H04M3/12 - Marking faulty circuits "busy" Enabling equipment to disengage itself from faulty circuits; Using redundant circuits; Response of a circuit, apparatus or system to an error
  • H04M3/14 - Signalling existence of persistent "off-hook" condition
  • H04M3/2281 - Call monitoring
  • H04M3/64 - Arrangements for signalling the number or class of the calling line to the operator
  • H04M15/04 - Recording calls , or communications in printed, perforated or other permanent form
  • H04Q3/0012 - in which the relays are arranged in a matrix configuration
  • H04M3/42059 - Making use of the calling party identifier
  • H04M2242/22 - Automatic class or number identification arrangements
  • H04Q3/72 - Finding out and indicating number of calling subscriber

• US Classifications

  • 379 - Telephonic communications