Hydroquinone derivatives and their use in photographic materials
US4480104A · kind A · utility
1Cited by
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1Claims
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Assignee
Inventors
Key dates
| Filing date | May 15, 1983 |
| Grant date | Oct 30, 1984 |
| Priority date | — |
| Expiry date | May 15, 2003 |
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 has the meaning assigned to X, 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.