Patents by Inventor Curtis L. Engelman

Curtis L. Engelman 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).

  • Spruing assembly
    Patent number: 4558841
    Abstract: A spruing assembly for receiving investment material in the production of an investment mold for castings by the "lost wax" process which includes a hollow chamber to receive the investment material formed by a base member and an engaging tapered ring. A horizontal feeder bar is contained within the chamber and is supported by hollow sprue means. The feeder bar is open at its top and has a narrow channel for conducting molten wax into the hollow sprue support. The base member includes a centralized sprue base former and support means associated with the former to provide support for the hollow sprue means supporting the feeder bar.
    Type: Grant
    Filed: February 10, 1984
    Date of Patent: December 17, 1985
    Assignee: Dentifax International Inc.
    Inventors: Melvin A. Engelman, Victor Zamaloff, Curtis L. Engelman