Hydroquinone derivatives and their use in photographic materials
US4426444A · kind A · utility
1Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Sep 17, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are hydrogen or alkyl, X represents the atoms to complete an aromatic heterocyclic ring system and Y is hydrogen or the group ##STR2## where X is defined as above, are readily cleaved in alkaline solutions to release a hydroquinone derivative. The compounds can be incorporated into photographic materials used for activation processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.