3330914

Information

• Patent Grant
• 3330914

• References
• Source

• Patent Number

  3,330,914

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1967
  57 years ago

• CPC

  • H04Q3/42 - Circuit arrangements for indirect selecting controlled by common circuits
  • H04M1/515 - by generating or selecting other signals than trains of pulses of similar shape or other signals than currents of one or more different frequencies
  • H04M3/2272 - Subscriber line supervision circuits
  • H04Q1/38 - using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
  • H04Q3/00 - Selecting arrangements

• US Classifications

  • 379 - Telephonic communications
  • 340 - Communications: electrical