×

Surveillance and alarm device for room spaces

  • US 5,640,141 A
  • Filed: 11/02/1994
  • Issued: 06/17/1997
  • Est. Priority Date: 05/06/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A surveillance device adapted for use with a primary light fixture and a light switch in a room, comprising:

  • a fire detection sensor;

    an infrared radiation detector; and

    a control circuit having a microprocessor, the control circuit connected to the light fixture, light switch, fire detection sensor and infrared radiation detector, and the control circuit being adapted to control the surveillance device and the light fixture in response to first and second inputs which are made by operating the light switch to affect, in a predetermined manner, successive switch-ON and switch-OFF periods of at least first and second respective durations such that,in response to the first input, the control circuit monitors the infrared radiation detector and switches the light fixture ON if infrared radiation is detected by the infrared radiation detector, and switches the light fixture OFF if infrared radiation is not detected; and

    in response to the second input, the control circuit monitors the fire detection sensor and infrared radiation detector to provide an alarm condition by toggling the light fixture rapidly between ON and OFF if either fire or infrared radiation is detected and, until such is detected, maintains the light fixture switched-OFF.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×