Patents by Inventor Jerry C. Tyndall

Jerry C. Tyndall 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 detector with phase related circuit selective discrimination
    Patent number: 4099116
    Abstract: An improved metal detector circuit with selective discrimination for soil, mineral content or unwanted metal objects is described in which phase related adjustable feedback circuits are utilized to nullify unwanted signals in the receiver detector circuits. A mode switch connects either unwanted metallic object rejection level feedback control or ground mineral rejection controls as desired into the reception coil circuit. By phase relating the transmission and reception coils in a metal detector, all of the mineral content in the soil which produces unwanted signals in the receiver can be nulified so that a practical detector for use in high mineral content areas results.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: July 4, 1978
    Inventor: Jerry C. Tyndall
  • Detector or the like
    Patent number: D248627
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: July 25, 1978
    Inventor: Jerry C. Tyndall