Patents by Inventor Hubert D. Sellars

Hubert D. Sellars 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).

  • Patent number: 5124105
    Abstract: In the manufacture of a wax pattern for use in the lost wax casting of a bladed rotor of the radial flow type, the bladed region of a master pattern is enclosed by a curable epoxy resin/aluminium powder composition. Sufficient of the cured resin composition is then machined away so that a plurality of resin composition segments are defined, one segment being interposed between adjacent blades on the master pattern. The segments are then removed from the master pattern and placed in an appropriately configured die member so as to define a complete die for the production of a wax pattern in the form of the master pattern.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: June 23, 1992
    Assignees: Rolls-Royce plc, Rolls-Royce Business Ventures Limited
    Inventors: James Broughton, Graham J. Marklew, Mark H. Griffiths, Hubert D. Sellars
  • Patent number: 4186222
    Abstract: A method of insulating a shell mould for investment casting by adhering a particulate or fibrous insulator such as perlite, vermiculite or ceramic fibres to a shell mould by an adherent coating. In a preferred process the shell mould is first dipped into the adherent coating and the particulate insulator is applied to the mould through a stuccoing process. Multiple layers of insulation can be applied to the mould to vary the thickness of insulation as required.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: January 29, 1980
    Assignee: Rolls-Royce (1971) Limited
    Inventors: Hubert D. Sellars, David Mills, Michael F. J. Ford