Patents by Inventor George A. Shoenfelder

George A. Shoenfelder 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 detectors utilizing a hydrophilic substance
    Patent number: 5781291
    Abstract: A smoke detector incorporates a porous plastic material which carries a hydrophilic agent alone or in combination with a surfactant which can be sprayed or deposited onto structural elements of the detector. The detector can include a molded removable plastic element that carries a hydrophilic agent. The element can be arranged to surround a light beam injected into a sensing region of a photoelectric detector.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: July 14, 1998
    Assignee: Pittway Corporation
    Inventors: Bernard Y.C. So, George A. Shoenfelder, Juliette C. Daly