Patents by Inventor Curtis Greenwalt

Curtis Greenwalt 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).

  • Steel rule die having improved rule holders
    Patent number: 5275076
    Abstract: A steel rule die including holders providing a holding force assisting in retaining the die rules in their rule slots. The holders include a plurality of resiliently compressible polyurethane plugs positioned adjacent the rules at desired spaced apart locations in cavities formed in the die base member. The plugs are compressibly received in the cavities and have associated portions thereof extending from the cavities which positively urge against the sides of the rules.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: January 4, 1994
    Assignee: Atlas Die Inc.
    Inventor: Curtis Greenwalt