Patents by Inventor Walter R. Dannheim

Walter R. Dannheim 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).

  • Process of embossing and perforating thermoplastic film
    Patent number: 4280978
    Abstract: In the process of embossing film by continuously passing the film through a nip formed by cooperating pattern and backup rolls, the improvement of passing the embossed pattern while in registration with the pattern roll through a second nip to improve the pattern detail. The apparatus includes a second backup roll in pressurized contact with the pattern roll forming the second nip. The surface configuration of the rolls may be such as to locally perforate the film within the pattern.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: July 28, 1981
    Assignee: Monsanto Company
    Inventors: Walter R. Dannheim, John A. McNaboe