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:
Jun. 26, 2001
Filed:
Mar. 12, 1999
Mamoru Sakurazawa, Minami-Ashigara, JP;
Junichiro Hosokawa, Minami-Ashigara, JP;
Keiji Mihayashi, Minami-Ashigara, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A method for producing a silver halide photographic emulsion comprises a step of spectrally sensitizing a silver halide photographic emulsion material that contains tabular silver halide grains having an aspect ratio of 3 or more in an amount of 50% or more of the total projected area of all the silver halide grains, and a step of performing the spectral sensitization by the addition of a cyanine dye in an amount of 60% or more of the saturated covering amount of the silver halide grains, and the emulsion is produced in the presence of 400 to 2,500 ppm of calcium ions and/or 50 to 2,500 ppm of magnesium ions.