Patents by Inventor Kurt Hefti

Kurt Hefti 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 for word processors, printers and typewriters
    Patent number: 4502801
    Abstract: A typewriting or printer film ribbon cassette has a carrier with fixedly spaced pins forming axes for the takeup and supply spools so that, as the ribbon builds up on the takeup spool, the carrier is shifted away from a feed wheel whose axis is coplanar with the axes of the supply and takeup spools against the force of a spring urging the carrier in the opposite direction.
    Type: Grant
    Filed: March 22, 1983
    Date of Patent: March 5, 1985
    Assignee: Franz B/u/ ttner AG
    Inventors: Kurt Hefti, Stefan Wirth