Patents by Inventor Humphry Robert Evatt

Humphry Robert Evatt 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).

  • Cryosurgical instrument
    Patent number: 4063560
    Abstract: The invention provides for re-warming of a cryosurgical instrument after its use in the cold mode, during which refrigerant is supplied through a first duct through first restriction, by admitting to the cavity within the probe tip fluid from a pressurized source through a second duct this supply being subject to control imposed by a second restriction.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: December 20, 1977
    Assignee: Spembly Limited
    Inventors: Ernest Hilton Thomas, Humphry Robert Evatt