Substituted hydroquinones
US4540785A · kind A · utility
0Cited by
0References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1983 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Nov 8, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/3021
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Hydroquinones of the formula ##STR1## wherein X is the residue of a 5- or 6-membered ring, R.sub.1 is hydrogen, alkyl or aryl, R.sub.1,R.sub.3, R.sub.4 and R.sub.5 are hydrogen or alkyl and R.sub.6 is hydrogen or a group of the formula ##STR2## wherein X and R.sub.1 are as defined above, are of use as protected developing agents in photographic silver halide material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.