3716680

Information

• Patent Grant
• 3716680

• References
• Source

• Patent Number

  3,716,680

• Date Filed

  Not available

• Date Issued

  Tuesday, February 13, 1973
  52 years ago

• CPC

  • H04B3/16 - characterised by the negative-impedance network used

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications