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. 25, 1990
Filed:
Apr. 12, 1988
Toyoki Nishijima, Odawara, JP;
Kaoru Onodera, Odawara, JP;
Konica Corporation, Tokyo, JP;
Abstract
A silver halide photographic light-sensitive material which is prevented from softening in gradiation of the toe proportion on the resultant characteristics curve during the storage of the material. The photographic material comprises a support having thereon at least one silver halide emulsion layer, and contains a magenta coupler represented by the following formula M-1 and at least one surface active agent having in the molecule thereof at least two groups selected from the group consisting of a carboxy group and salt thereof, a sulfonic group and a salt thereof and a salt of sulfric ester group. ##STR1## wherein Z represents a group of nonmetal atoms necessary for forming a nitrogen-containing heterocycle which may have a substituent group; X represents a hydrogen atom, or a group capable of being split off upon the reaction with the oxydized product of a color developing agent; and R represents a hydrogen atom or a substituent.