Patents by Inventor Karl Chulick

Karl Chulick 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).

  • Electronic metal detector return signal phase changer
    Patent number: 5247257
    Abstract: A device is disclosed for use with heterodyne metal detectors to eliminate the indication of the detected presence of certain specific metals to the operator. A specially tuned circuit rotated adjacent the detector interacts with the circuitry of the detector to eliminate the audio and visual response of the detector to certain predetermined undesired metal objects. The device includes two coils, one of low impedance and high resistance and the other of high impedance and low resistance.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: September 21, 1993
    Inventor: Karl Chulick