3634824

Information

• Patent Grant
• 3634824

• References
• Source

• Patent Number

  3,634,824

• Date Filed

  Not available

• Date Issued

  Tuesday, January 11, 1972
  52 years ago

• CPC

  • G08B26/002 - only replying the state of the sensor
  • H04Q9/12 - using combinations of frequencies

• US Classifications

  • 340 - Communications: electrical