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:
Jul. 21, 1998
Filed:
Mar. 15, 1996
Reinhold Ruger, Rodermark, DE;
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Silver halide recording material for the production of negative images with ultrahigh contrast. Known silver halide recording materials for the production of negative images with ultrahigh contrast contain hydrazine compounds and contrast-increasing compounds (so-called boosters). A material with a new class of such boosters is being presented here, whereby they contain a sulfonyl urea, sulfonyl urethane or sulfuryl diamide group as well as a tertiary amino group in the molecule. The invention also comprises a process for the production of black-and-white negative images with ultrahigh contrast using the material according to the invention. It is especially useful for reproduction in the pre-press stage.