Patents by Inventor Geoffrey D. Hallett

Geoffrey D. Hallett 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).

  • Furnace tapping apparatus
    Patent number: 3973761
    Abstract: A method and an apparatus for stopping the flow of metal from the taphole of a furnace. The method comprises the step of blowing air into the taphole with sufficient pressure to reverse the flow of the molten metal, and then reducing the pressure to a value sufficient to hold the metal in the furnace. The apparatus comprises a pipe adapted to be inserted into the taphole and of sufficient dimension to seal the taphole, and means for blowing air into the pipe initially at a predetermined pressure so as to reverse the flow of the molten metal in the taphole and then at a reduced pressure sufficient to hold the metal in the furnace.
    Type: Grant
    Filed: May 9, 1974
    Date of Patent: August 10, 1976
    Assignee: Noranda Mines Limited
    Inventors: Albert Pelletier, Geoffrey D. Hallett