Patents by Inventor Clifford Hannam

Clifford Hannam 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).

  • Metal detecting apparatus and apparatus including guide housing for guiding a metal test piece, for testing metal detecting apparatus
    Patent number: 5160885
    Abstract: Apparatus for testing metal detecting apparatus employs a test piece of representative metal which is passed through a section of the electromagnetic field of the metal detecting apparatus to record a response signal as if metal has been detected. The testing apparatus comprises the test piece and a housing for the test piece which extends through said section of the electromagnetic field and acts to guide the test piece along its path, said movement of the test piece causing distortion of the electromagnetic field and actuation of the detecting mechanism to give the required signal. Metal detecting apparatus may have the testing apparatus attached thereto or moulded integrally therewith.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: November 3, 1992
    Assignee: Hitech Metal Detectors Limited
    Inventors: Clifford Hannam, Gerald A. Harwood