Patents by Inventor Ralph Hopper

Ralph Hopper 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).

  • Insulation tester or the like
    Patent number: D300123
    Type: Grant
    Filed: March 26, 1986
    Date of Patent: March 7, 1989
    Assignee: Thorn EMI Instruments Limited
    Inventors: Peter G. Nichols, Ralph Hopper, Christopher L. Steggall, Terence M. Friend