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. 15, 1998
Filed:
Apr. 10, 1996
Mitsuo Saitou, Minami-Ashigara, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A silver halide emulsion is disclosed, comprising at least a dispersing medium and silver halide grains, wherein at least 60% of the total projected area of silver halide grains is occupied by tabular grains having a crystal defect for anisotropic growth which have a {100} face as a main plane and an aspect ratio (diameter/thickness ratio) of not less than 2.0, and the right-angled parallelogram enclosed with {100} faces at the edges of the tabular grains or a right-angled parallelogram formed by extending the {100} faces at the edges having a slenderness side ratio (a ratio of the length of the long side to that of the short side) of 1 to 6; and said silver halide emulsion is prepared in the presence of a compound A.sup.0 and/or a compound B.sup.0, wherein the compound A.sup.0 represents an organic compound having covalently bonded to an individual molecule thereof at least two molecules of an adsorbable agent which accelerates formation of a {100} face of silver bromide grains, and the compound B.sup.0 represents an organic compound except gelatin having at least four alcoholic groups per molecule, both the compounds A.sup.0 and B.sup.0 are organic compounds except gelatin and other proteins. The emulsion is excellent in sensitivity, image quality and preservability.