3912878

Information

• Patent Grant
• 3912878

• References
• Source

• Patent Number

  3,912,878

• Date Filed

  Not available

• Date Issued

  Tuesday, October 14, 1975
  49 years ago

• CPC

  • H04B3/16 - characterised by the negative-impedance network used
  • H04B3/42 - Circuits for by-passing of ringing signals
  • H04M3/40 - Applications of speech amplifiers

• US Classifications

  • 379 - Telephonic communications
  • 333 - Wave transmission lines and networks