Patents by Inventor Fredrick Villers

Fredrick Villers 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).

  • Pyroelectric sensor with high sensitivity
    Patent number: 4868390
    Abstract: A pyroelectric sensor circuit arrangement for reducing noise and increasing sensitivity has a main current amplifier with a high feedback resistor connected to receive input from an electrode of a pyroelectric element, and includes a compensation amplifier in a unity gain amplifier configuration connected to a common power source with the main amplifier. The compensation amplifier is connected to discharge transients from the pyroelectric element when electrode voltage exceeds the positive voltage or goes below the negative voltage of the power source. A pair of anti-parallel diode or similar component is connected between the main amplifier input and the compensation amplifier output.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: September 19, 1989
    Assignee: ELTEC Instruments, Inc.
    Inventors: Hans J. Keller, Fredrick Villers