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:
Jul. 29, 1997
Filed:
Jun. 06, 1995
Mitsuo Saitou, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A silver halide emulsion comprises silver halide grains 35% or more of the total projected area of which are tabular grains having a {100} plane as a main plane and having an average aspect ratio of 1.3 to 7.9 which have been prepared via at least nucleation and ripening procedures. The emulsion is characterized in that said ripening procedure is conducted with substantially no NH.sub.3 present in the system. In a preferred embodiment, the ripening procedure is followed by the addition of fine silver halide grains substantially free of screw dislocation defects and having a diameter of 0.15 .mu.m or less that causes crystal growth. The nucleation is effected by the simultaneous addition of a silver salt and a halide salt solution to a dispersant solution. The resulting nuclei have a Br.sup.- content of 60 mol % or more. Cl.sup.- is present in said dispersant solution in an amount of 10.sup.-5 mol/l or more before the simultaneous addition.