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:
May. 05, 1992
Filed:
Oct. 10, 1989
Applicant:
Inventors:
Ubbo Wernicke, Cologne, DE;
Werner Berthold, Leverkusen, DE;
Helmut Haseler, Leverkusen, DE;
Gustav Tappe, Leverkusen, DE;
Assignee:
Agfa Gavaert Aktiengesellschaft, Leerkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ;
U.S. Cl.
CPC ...
430379 ; 430380 ; 430382 ; 430407 ;
Abstract
The present invention relates to a photographic reversal process for the production of positive photographic images by imagewise exposure of the photosensitive material containing at least one silver halide emulsion layer, black-and-white first development of the material, chemical fogging or diffuse second exposure and subsequent color development, characterized in that