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. 09, 1990
Filed:
May. 02, 1989
Shunichi Aida, Kanagawa, JP;
Yoshinori Shibata, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer containing at least one emulsion in which chemically sensitized silver halide grains are composed of tabular silver halide grains having a diameter of a circle corresponding to the projected area of at least 0.4 .mu.m and an average aspect ratio of at least 2 are present in a ratio of at least 50% based on the total projected area of all silver halide grains in the emulsion layer, the tabular silver halide grains having a stratified structure containing at least one layer distinguished from each other with planes substantially parallel to the two main planes facing each other thereof, an average iodine content of the outermost layer therein being higher than an average iodine content of the whole silver halide grain by at least 1 mole %, and where weight ratio (gold/silver) of the amount of gold coated per unit area to the amount of silver coated per unit area of the photographic material being not more than 8.0.times.10.sup.-6. The silver halide photographic material is prevented from an increase in fog, a degradation of graininess and a decrease in sensitivity with the passage of time between the production and the use thereof.