Patents by Inventor Peter J. Betts

Peter J. Betts 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).

  • Light sensing and emitting devices with a safelight
    Patent number: 4906835
    Abstract: A light sensor for use to detect only light above a given frequency uses as its light sensitive element a light emitting diode. The L.E.D. is one which, if it were arranged to emit light, would emit light having a maximum frequency equal to the said given frequency.In combination with such a sensor another L.E.D. can be used having a maximum emission frequency below the said given frequency to illuminate an area without affecting the light sensor.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: March 6, 1990
    Assignee: The General Electric Company, p.l.c.
    Inventor: Peter J. Betts