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:
Nov. 17, 1992
Filed:
Aug. 16, 1991
Christa Strobel, Zollikerberg, CH;
Rolf Bronnimann, Buchs, CH;
Gretag Systems, Inc., Bothell, WA (US);
Abstract
The copying light of a source of copying light is attenuated in areas using a mask with different density ranges to influence the density by areas of a copy to be produced from a copy master. The appropriate area of the mask is selected by analyzing a location dependent density variation of the mask stored in matrix form in a computing and evaluating unit by predetermined criteria. A photographic copying apparatus associated with the process includes an exposure station with a mask mounted on a slide. The slide may be displaced in response to control signals determined and generated in the computing and evaluating unit. The slide is displaced in a plane parallel to a transport plane of the copy master in the beam path of a source of copying light.