Patents by Inventor John L. Corl

John L. Corl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Smoke detector with improved testing
    Patent number: 4870394
    Abstract: A light scatter smoke detector includes an infrared light source and light sensor in a smoke chamber, the chamber including an adjustable screw which serves as a scatter reflector to provide an operating voltage used both in normal operation and for testing. A dual channel is also provided by a splitting off some light from the light source into a separate reference channel which is also used for threshold detection or proper ratioing.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: September 26, 1989
    Assignee: Systron-Donner Corp.
    Inventors: John L. Corl, Gregory S. Triplett