Hydroquinone derivatives and their use in photographic materials
US4417072A · kind A · utility
1Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1981 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Sep 29, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Substituted hydroquinone compounds of the formula ##STR1## wherein R.sub.1 to R.sub.4 are hydrogen or alkyl and Z is an aromatic ring or a group of the formula --X--Y--X--, wherein X is an aromatic ring and Y is an electron withdrawing group, are incorporated as developers into photographic materials. These materials are suitable for activation processings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.