Patents by Inventor John D. Slack

John D. Slack 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).

  • Investment casting
    Patent number: 4561491
    Abstract: A method of manufacturing a mould for use in the investment casting of a hollow gas turbine engine blade in which a ceramic core is coated with a surface modifying material prior to the application of wax thereto to define a pattern of the object to be cast. The surface modifying material adheres to the core and provides a textured surface to which the wax keys, thereby preventing the wax lifting from the core.
    Type: Grant
    Filed: November 14, 1984
    Date of Patent: December 31, 1985
    Assignee: Rolls-Royce Limited
    Inventor: John D. Slack