Patents by Inventor Donald S. Pratt

Donald S. Pratt 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).

  • Method of and apparatus for isostatically pressing a body from particulate material
    Patent number: 4655984
    Abstract: A method of and apparatus for forming a pressed body (54) with a bore (56) therein and with a notch (58) in the exterior surface thereof. The body (54) is formed by isostatically pressing particulate material (52) in an elastic mold (14) so that the material (52) is compacted into a self-supporting mass. Used in conjunction with the elastic mold is a mold closure and core holder member (32) to which is fixed a rigid core (42) and a resilient notch defining bar (44).
    Type: Grant
    Filed: October 15, 1984
    Date of Patent: April 7, 1987
    Assignee: Champion Spark Plug Company
    Inventors: Jonathan W. Hinton, Donald S. Pratt, Edward J. Gehart