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:
Sep. 02, 1997
Filed:
Apr. 16, 1996
Applicant:
Inventor:
Reinhold Ruger, Rodermark, DE;
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ;
U.S. Cl.
CPC ...
430264 ; 430599 ; 430600 ; 430602 ; 430603 ;
Abstract
Silver halide recording material for making negative images having ultrahigh contrast. Known silver halide recording materials for making negative images having ultrahigh contrast contain hydrazine compounds and contrast enhancing compounds (so-called boosters). The invention involves a material having a new class of such a booster, containing in its molecule at least one nitrile group and a tertiary amino group. The invention also includes a process for making black-and-white negative images having ultrahigh contrast by using the invention's materials. The invention is particularly useful in the pre-press stage for printing.