Patents by Inventor David E. Perlman

David E. Perlman 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).

  • Infrared detection system
    Patent number: 4225786
    Abstract: An infrared radiation intruder detection system is disclosed which employs a unique pyroelectric detector array. The array comprises a pyroelectric plastic film having electrodes arranged on opposing surfaces to define a plurality of heat-sensitive capacitors connected in parallel. According to a preferred embodiment, the film of selected detector elements is poled to a polarity opposite that of the other elements to cause internal cancellation of signals due to events which affect an even number of detectors simultaneously.
    Type: Grant
    Filed: September 15, 1978
    Date of Patent: September 30, 1980
    Assignee: Detection Systems, Inc.
    Inventor: David E. Perlman