Patents by Inventor Rolf Herold

Rolf Herold 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).

  • Patent number: 3951668
    Abstract: A multicolor printing method for reproducing varicolored images on substrates having a white surface by printing with inks of three primary colors, i.e. a color absorb blue (cab) which is a yellow, a color absorb green (cag) which is a red-violet and a color absorb red (car) which is a blue-green, producing printed colors having spectral density curves passing through matching ranges of optical densities at characteristic wavelengths in the visible spectrum, the ranges being within the following parameters: Range of Optical density in % of D.sub.max Wavelengths cab cag car ______________________________________ 407 to 423 nm 65 to 93 2 to 27 39 to 79 453 to 456 nm 89 to 101 10 to 25 12 to 25 492 to 496 nm 60 to 74 65 to 81 1 to 10 538 to 541 nm 4 to 14 88 to 103 13 to 25 584 to 591 nm 1 to 3 50 to 75 65 to 88 633 to 646 nm 1 to 3 1 to 4 84 to 109 ______________________________________D.sub.
    Type: Grant
    Filed: July 5, 1973
    Date of Patent: April 20, 1976
    Assignee: Druckfarbenfabrik Gebr. Schmidt GmbH
    Inventors: Ernst Schumacher, Hans Bremer, Rolf Herold