Patents by Inventor John D. Yewen

John D. Yewen 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).

  • Apparatus for and method for testing the number of turns on a coil
    Patent number: 3953791
    Abstract: Apparatus and method for testing the number of turns on a coil by magnetically energizing a rod through an energizing coil and with compensating coils modifying the flux about the rod to provide a space in which the flux is substantially uniform and within which space is placed the coil to be tested.
    Type: Grant
    Filed: June 14, 1974
    Date of Patent: April 27, 1976
    Assignee: H. Tinsley & Co. Ltd.
    Inventors: Ronald Frederick Spurr, Colin Alan Boardman, John D. Yewen