Patents by Inventor Friedrich Hagemeyer

Friedrich Hagemeyer 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).

  • Inking ribbon including a sublimable release layer for color transfer under the influence of heat
    Patent number: 4756633
    Abstract: An improved inking ribbon for color transfer under the influence of heat comprises the ribbon having a carrier layer and a colored layer with the heat-soluble release layer interposed therebetween, which release layer is composed of a sublimable material to avoid renewed adhesion of the released portion of the color layer to the inking ribbon after a color transfer to the printing medium has occured.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: July 12, 1988
    Inventors: Friedrich-Wilhelm Drees, Hartmut Grethen, Friedrich Hagemeyer, Wolfgang Pekruhn