3399280

Information

• Patent Grant
• 3399280

• References
• Source

• Patent Number

  3,399,280

• Date Filed

  Not available

• Date Issued

  Tuesday, August 27, 1968
  56 years ago

• CPC

  • H03K17/70 - having two electrodes and exhibiting negative resistance
  • H04M15/08 - Metering calls to called party
  • H04Q3/00 - Selecting arrangements

• US Classifications

  • 379 - Telephonic communications
  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems