Patents by Inventor Heinz-Helmut Frost

Heinz-Helmut Frost 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).

  • Punch device for making window cut-outs
    Patent number: 4537588
    Abstract: A rotary punch device for making window cut-outs in envelopes and cardboard oxes, with a clamping device for clamping a metal foil having a cutting edge etched out of the foil material. Vacuum bores in the cylindrical surface of the rotary punch retain the material for treatment in position while the punched-out portion of the window is initially also retained by a vacuum and blown away by an air blast on completion of the punch operation.
    Type: Grant
    Filed: January 16, 1984
    Date of Patent: August 27, 1985
    Assignee: Winkler & Dunnerbier Maschinenfabrik und Eisengiesserei GmbH & Co. KG.
    Inventors: Gunter Ehlscheid, Heinz-Helmut Frost