Patents Assigned to George Sellman
  • Patent number: 5469141
    Abstract: A motion sensor for use with a security system provides an output signal to initiate an alarm whenever a significant level of movement is detected by the motion sensor. A light emitter directs light through an optical path onto a light detector, which generates an electrical output signal in response to the light directed onto it. A resiliently supported mass is coupled to the optical path to modify the optical path in response to motion imposed upon the mass, thereby reducing the transmission of light in the optical path and affecting the electrical signal as the mass moves. The motion sensor of the present invention is responsive to movement in all directions, and, since it is optical in nature, is immune to the presence of magnetic fields.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: November 21, 1995
    Assignee: George Sellman
    Inventor: John Ghazarian