3491209

Information

• Patent Grant
• 3491209

• References
• Source

• Patent Number

  3,491,209

• Date Filed

  Not available

• Date Issued

  Tuesday, January 20, 1970
  55 years ago

• CPC

  • H04Q3/521 - using semiconductors in the switching stages
  • H03K17/70 - having two electrodes and exhibiting negative resistance
  • H03K17/78 - using opto-electronic devices

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications