3815093

Information

• Patent Grant
• 3815093

• References
• Source

• Patent Number

  3,815,093

• Date Filed

  Not available

• Date Issued

  Tuesday, June 4, 1974
  51 years ago

• CPC

  • G08B26/003 - replying the identity and the state of the sensor
  • G08B26/00 - Alarm systems in which substations are interrogated in succession by a central station

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications