Patents by Inventor Donald L. Lessard

Donald L. Lessard 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).

  • Vacuum valve apparatus for die casting
    Patent number: 5314002
    Abstract: The vacuum valve apparatus is used in die casting equipment of the type which utilize a source of vacuum pressure in an internal die cavity for making a casting. The apparatus includes a valve body that has components that are separable along a split line that is positioned to facilitate removal of casting material from internal ports that may result in the event of a malfunction.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: May 24, 1994
    Assignee: Outboard Marine Corporation
    Inventors: Russell J. VanRens, Donald L. Lessard