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:
May. 18, 1993
Filed:
May. 09, 1991
Masao Koga, Nagaokakyo, JP;
Minoru Ohashi, Nagaokakyo, JP;
Mitsubishi Paper Mills Limited, Tokyo, JP;
Abstract
Disclosed is a method for image formation which comprises developing a silver halide photographic photosensitive material in the presence of a compound represented by the following formula [I] or [II]: ##STR1## wherein Ar represents an aryl group, R.sub.1, R.sub.2 and R.sub.3 which may be identical or different each represents a hydrogen atom, an alkyl group, an aralkyl group, an aryl group, or a heterocyclic group, with a proviso that they cannot be simultaneously hydrogen atoms, R.sub.1 and R.sub.2 may link to each other to form a ring, and at least one of R.sub.1, R.sub.2 and R.sub.3 has at least one hydroxyl group as a substituent, ##STR2## wherein Ar.sub.1 and Ar.sub.2 each represents a divalent aromatic group, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, R.sub. and R.sub.2 may link to each other to form a ring and R.sub.3 and R.sub.4 may link to each other to form a ring, L represents a divalent linkage group, and n represents 0 or 1.