Patents Assigned to Pelikan A.G.
  • Patent number: 4296150
    Abstract: A transparent image sheet carrier for overhead-projection systems is described based upon a dark-tone colored field with image markings in bright-tone contrasting colors, including a sheet bearing a layer containing at least one acid-resistant dye for imparting the dark-tone color to the field; the dye may be discharged in the locale of the image markings by a discharge device with a simultaneous appearance in the image locale of the bright-tone contrasting color.
    Type: Grant
    Filed: April 1, 1980
    Date of Patent: October 20, 1981
    Assignee: Pelikan A.G.
    Inventors: Norbert Mecke, Franz U. Schmitt, Karl-Heinz Schrader, Heinke Blutschkau
  • Patent number: 4246033
    Abstract: Arrangement for applying written or drawn information onto image carriers for overhead projectors, characterized by an image carrier in film or plate form which comprises at least one colored compound, as well as a writing or drawing marker. The writing or drawing fluid of the marker contains at least one colorless compound which reacts with the colored compound to produce a color change.
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: January 20, 1981
    Assignee: Pelikan A.G.
    Inventor: Rene von Wartburg
  • Patent number: D256479
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: August 19, 1980
    Assignee: Pelikan A.G.
    Inventor: Christoph Manusch