Method for image formation
US5254436A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1991 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Dec 23, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/061
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a method for image formation which is free from the problems such as uneven development and pepper fog and can give photographic characteristics of extremely high contrast negative tone using a stable developer and which comprises developing a silver halide photographic light-sensitive material in the presence of a compound represented by the following formula (I): ##STR1## wherein R.sub.1 represents an alkyl group of 1-8 carbon atoms or a cycloalkyl group having 4-8 carbon atoms in the ring, R.sub.2, R.sub.3 and R.sub.4 may be identical or different and 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.2 and R.sub.3 may link to each other to form a ring structure, and at least one hydroxy group is present in the substituents R.sub.2, R.sub.3 and R.sub.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.