Quinone methide photograhpic reagent precursors
US3993661A · kind A · utility
6Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | May 3, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/365
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Novel compounds are disclosed which release a photographic reagent in the presence of alkali and are therefore useful in photographic products and processes. The compounds may be defined as quinone- or naphthoquinonemethide precursors containing a mercapto-azole or azine photographic reagent moiety.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.