Patents Assigned to Gentex Company
  • Smoke detecting device
    Patent number: 4001800
    Abstract: A smoke detector and alarm system incorporating means for detecting airborne particles of smoke and activating an alarm for fire warning purposes, the system including an illuminating circuit having a light emitting diode therein, a smoke sensing and compensation circuit having a pair of photo-electric cells incorporated therein, a comparator and a trigger circuit, and an alarm circuit.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: January 4, 1977
    Assignee: Gentex Company
    Inventor: Jeffrey L. Franks