The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1976
Filed:
Jul. 05, 1973
Ernst Schumacher, Frankfurt am Main, DT;
Hans Bremer, Nieder-Ramstadt, DT;
Rolf Herold, Bad Homburg vor der Hobe, DT;
Druckfarbenfabrik Gebr. Schmidt GmbH, Frankfurt am Main, DT;
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.max marking the range of the maxima of the three spectral density curves, which is spaced from the optical density of the white surface D.sub.O by a distance corresponding to the density of the solid areas obtained by printing with normal inking.