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:
Oct. 13, 1992
Filed:
Mar. 22, 1991
Yoji Hara, Hino, JP;
Akira Kobayashi, Hino, JP;
Takeshi Sampei, Hino, JP;
Miho Sai, Hino, JP;
Akira Ogasawara, Hino, JP;
Konica Corporation, Tokyo, JP;
Abstract
An improved silver halide photographic material that has at least one silver halide emulsion layer on a support and that contains a hydrazine derivative in said emulsion layer or an adjacent layer. The improvement is that said emulsion layer or at least one of the other hydrophilic colloidal layers contains at least one of the compounds represented by the following general formulas (I) and (II): ##STR1## wherein R.sub.1 and R.sub.1 ' are each a group selected from among a substituted or unsubstituted alkane residue, an alkene residue, a benzene residue, a cyclohexane residue and a nitrogenous heterocyclic residue; R.sub.2 is a substituted or unsubstituted alkyl group; R.sub.3, R.sub.3 ', R.sub.4 and R.sub.4 ' are each a hydrogen atom or a substituted or unsubstituted methyl group, provided that R.sub.3 and R.sub.4 or R.sub.3 ' are not a methyl group at the same time; Y is a divalent organic residue; M and M' are each a hydrogen atom, an alkali metal, an ammonium salt or an organic amine salt; P is a positive integer; and m is 0 to 1.