Patents by Inventor Rettkel Wilfried

Rettkel Wilfried 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).

  • Ribbon cassette
    Patent number: 4810116
    Abstract: A ribbon cassette for electronically controlled typewriters or similar machines equipped with a signal generator, the ribbon cassette being disposed on a carriage moveable along the platen. The present invention is also directed to the combination of such a ribbon cassette with such a machine.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: March 7, 1989
    Assignee: Ta-Triumph-Adler Aktiengesellschaft
    Inventors: Jurgen Schulze, Rettkel Wilfried