Patents by Inventor Frederick Henry Wallis

Frederick Henry Wallis 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).

  • Duplex surge arrestors
    Patent number: 3958154
    Abstract: This invention relates to a duplex surge arrestor comprising two gas-filled surge arrestors showing commoned electrodes through which commoned electrodes extends a passage for conveying ionised gas from one arrestor to the other, and in which duplex surge arrestor the electrodes are of such shape, disposition and material that when an excessive dissipation of energy occurs on any two electrodes therein, the discharging electrodes melt and fuse together.
    Type: Grant
    Filed: November 20, 1974
    Date of Patent: May 18, 1976
    Assignee: Comtelco (U.K.) Limited
    Inventors: John Hill, Henryk Turczanski, Frederick Henry Wallis