Patents by Inventor Roland M. Preiser

Roland M. Preiser 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).

  • Piston mold
    Patent number: 5289866
    Abstract: A piston casting mold for casting all pistons in a single series with little weight variation one from the next, includes spacers of fixed dimensions are employed to locate a dome-forming core of the mold a fixed distance from a stationary portion of the mold from one casting to the next. Increasing or decreasing the dimensions of the spacer permits increasing or decreasing the as-cast weight of the piston.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: March 1, 1994
    Assignee: General Motors Corporation
    Inventors: Clovis L. Parsley, Roland M. Preiser