3384874

Information

• Patent Grant
• 3384874

• References
• Source

• Patent Number

  3,384,874

• Date Filed

  Not available

• Date Issued

  Tuesday, May 21, 1968
  56 years ago

• CPC

  • H04Q9/16 - by predetermined number of pulses
  • G08B26/00 - Alarm systems in which substations are interrogated in succession by a central station
  • G08B26/002 - only replying the state of the sensor

• US Classifications

  • 340 - Communications: electrical