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:
Jun. 10, 1997
Filed:
Nov. 02, 1995
Satoshi Kaneko, Tokyo, JP;
Kenji Hirata, Tokyo, JP;
Akira Tanaka, Tokyo, JP;
Reinhold Ruger, Rodermark, DE;
Mitsubishi Paper Mills Ltd., Tokyo, JP;
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Negative images of super-high contrast can be formed by developing an exposed silver halide photographic photosensitive material in the presence of at least one compound selected from the compound of formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, R.sup.1 and R.sup.2, R.sup.3 and R.sup.4, R.sup.5 and R.sup.6, or R.sup.1 and R.sup.3, together with nitrogen atom to which they are attached, may form a ring; L.sup.1 and L.sup.2 independently represent an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be optionally substituted; A represents an atom selected from hydrogen, carbon, nitrogen, oxygen and sulfur or a divalent linkage group constituted from these atoms; and m and n represent 0 or 1, and the compound of formula (2) ##STR2## wherein R.sup.7, R.sup.8 and R.sup.9 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R.sup.7 and R.sup.8 together with nitrogen atom to which they are attached, may form a ring; L represents an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be substituted or unsubstituted; and E represents --N(COR.sup.11)--, --N(CONR.sup.12 R.sup.13)--, --NR.sup.14 COCONR.sup.15 --, --N(COCONR.sup.16 R.sup.17)--, --N(SO.sub.2 R.sup.18)-- or --N (COOR.sup.19)--, where R.sup.11 --R.sup.19 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; and R.sup.12 and R.sup.13 or R.sup.16 and R.sup.17 together with nitrogen atom to which they are attached, may form a ring, with the proviso that when E represents --N(COR.sup.11)--, --N(CONR.sup.12 R.sup.13)--, --N(SO.sub.2 R.sup.18)-- or --N(COOR.sup.19)--, R.sup.9 is not a hydrogen atom.