Patents by Inventor Walter Gill Ellson

Walter Gill Ellson 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).

  • Submersible thermostatically controlled heaters
    Patent number: 4107514
    Abstract: Instead of the usual glass case the heating element and thermostat of a submersible thermostatically controlled heater are disposed in separate cases made of metal and plastics respectively which are secured together in liquid-tight manner with the heating element connected through the thermostat to an external source of operating current and the metal case for the heating element connected to earth.
    Type: Grant
    Filed: January 27, 1977
    Date of Patent: August 15, 1978
    Assignee: C. Ellson & Co. Ltd.
    Inventor: Walter Gill Ellson