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. 13, 1978
Filed:
Feb. 14, 1977
Hiroshi Takano, Gotenba, JA;
Masatsugu Yoshino, Numazu, JA;
Hiroshi Naka, Yokohama, JA;
Yoshinobu Ito, Fuji, JA;
Tadao Matsushika, Fuji, JA;
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JA;
Abstract
A novel non-silver salt type photosensitive composition which comprises (A) N,N'-diphenyl-p-phenylenediamine as a color developing agent and tetramethylthiuram disulfide which unexpectedly functions rather as another color developing agent than as a storage stabilizer, (B) an organic halide compound as a photoactivator, (C) a salicylic acid derivative as a storage stabilizer for an unexposed photosensitive material, (D) thiourea which functions rather as an agent capable of functioning as both an anti-foggant at and after image formation and a contrasting agent than as a storage stabilizer, and (E) at least one member selected from the group consisting of (i) 2-methylindole, (ii) 2-mercaptothiazoline and (iii) p-diethylaminobenzaldehyde as a color tone adjusting agent. A photosensitive material or film obtained from the present photosensitive composition has an excellent storage stability in the unexposed state, and can give, only by dry process, a blackish brown image having a high photographic density and a high contrast, with fog occurrence reduced.