Patents by Inventor James H. T. Petch

James H. T. Petch 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).

  • Stirring means
    Patent number: 4215853
    Abstract: Fluid masses comprising molten metal, such as magnesium alloys, are stirred using a loop-shaped paddle rotating about an axis which itself rotates orbitally about a fixed axis, the loop being shaped so that it passes close to substantially the whole of the bottom of the vessel.
    Type: Grant
    Filed: December 7, 1978
    Date of Patent: August 5, 1980
    Assignee: Magnesium Elektron Limited
    Inventors: Peter Roebuck, James H. T. Petch
  • Stirring means to make magnesium alloys
    Patent number: 4178177
    Abstract: Fluid masses comprising molten metal, such as magnesium alloys, are stirred using a loop-shaped paddle rotating about an axis which itself rotates orbitally about a fixed axis, the loop being shaped so that it passes close to substantially the whole of the bottom of the vessel.
    Type: Grant
    Filed: October 13, 1977
    Date of Patent: December 11, 1979
    Assignee: Magnesium Elektron Limited
    Inventors: Peter Roebuck, James H. T. Petch