Patents by Inventor Karl-Heinz Bohne

Karl-Heinz Bohne 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).

  • Fabric printer ribbon comprising a liquid vehicle containing a decolorizable Lewis acid/Lewis base complex
    Patent number: 4773778
    Abstract: A fabric printer ribbon impregnated with a transfer medium comprised of a vehicle liquid and coloring agent dispersed in the vehicle liquid. The fabric printer ribbon may further contain property-improving additives. As the coloring agent, the ribbon contains a color reaction product in the form of a Lewis-acid/Lewis base color complex comprised of an organic chromogen and a color developer. The coloring agent is dissolved and/or dispersed as fine particles in the vehicle liquid. Such a fabric printer ribbon displays the advantage of correctability by means of an inhibitor of the color reaction. The corrected sheet can be typed over in customary fashion by means of the fabric printer ribbon in a second track of a fabric printer ribbon.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: September 27, 1988
    Assignee: Pelikan Aktiengesellschaft
    Inventors: Guenter Pietsch, Hubertus Greschenz, Karl-Heinz Bohne
  • Mechanically erasable printing liquid
    Patent number: 4596846
    Abstract: A printing ink for capillary or jet printers adapted to form a mechanically erasable image, comprises a latex-based aqueous polymer dispersion including a water-soluble or organic-solvent soluble dyestuff coloring the particles of the dispersion without the use of additional solvent.
    Type: Grant
    Filed: August 16, 1983
    Date of Patent: June 24, 1986
    Assignee: Pelikan Aktiengesellschaft
    Inventors: Karl-Heinz Bohne, Hans-Jurgen Rahn