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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.:

US 4169733 B1

PDFFull Text
Date of Patent:
Oct. 02, 1979

Filed:

Jan. 23, 1978

Process for forming high-contrast silver images

Applicant:
Inventors:

Tateshi Iytaka, Hino, JP;

Syunji Matsuo, Hino, JP;

Toshio Nagatani, Hino, JP;

Kazuo Takahashi, Hino, JP;

Takeshi Habu, Hino, JP;

Assignee:

Konishiroku Photo Industry Co., Ltd., Tokyo, JP;

Attorney:

Flynn & Frishauf

Primary Examiner:

Mary F Kelley

Int. Cl.
CPC ...
G03C / ; G03C / ; G03C / ;
U.S. Cl.
CPC ...
96 5 / ; 96 665 ; 96 95 ; 96107 ; 961145 ; 96 6 / ;
Abstract

Process for forming high-contrast silver images which comprises treating a light-sensitive silver halide photographic material provided with a hydrophilic colloidal layer containing a silver halide emulsion layer coated on a support and containing a tetrazolium compound, after imagewise exposure, with a developer and/or a processing solution prior to the developing, both of which contains at least a nitrogen-containing heterocyclic compound substituted with at least mercapto, thioketone or thioether group.

Find Patent Forward Citations

Iytaka, Tateshi. (1979). Process for forming high-contrast silver images (U.S. Patent No. 4169733). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4169733

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