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:
Mar. 13, 1990
Filed:
Sep. 04, 1987
Applicant:
Inventors:
Kazunobu Katoh, Kanagawa, JP;
Yoshihiro Takagi, Kanagawa, JP;
Kimitaka Kameoka, Kanagawa, JP;
Junji Miyata, Kanagawa, JP;
Toshinao Ukai, Kanagawa, JP;
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430264 ; 430606 ;
Abstract
A superhigh contrast negative type silver halide photographic material, comprising a support having provided thereon at least one silver halide emulsion layer, wherein the emulsion layer or at least one other hydrophilic colloid layer contains at least one hydrazine derivative and at least one organic desensitizer having at least one water-soluble group or alkali-dissociative group. The material has a reduced sensitivity suitable for processing in a bright room while enjoying the effect of the hydrazine derivative to increase contrast.