Patents by Inventor Roger A. Worman

Roger A. Worman 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).

  • Casting mold with constricting device
    Patent number: RE31972
    Abstract: A stricture is formed between riser and cast article in a conventional metal mold casting process to facilitate clean removal of the riser after casting by interposing thin-walled frangible constriction means between riser cavity and casting cavity prior to pouring molten metal; the flow of metal into casting cavity is also regulated thereby.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: August 20, 1985
    Assignee: Caterpillar Tractor Co.
    Inventors: John R. Nieman, Roger A. Worman