Development restrainer precursors for photographic elements
US4255510A · kind A · utility
13Cited by
8References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Oct 18, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/158
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Photographic elements, assemblages and processes for color diffusion transfer photography are described wherein certain azole compounds having at least two nitrogen atoms are employed as development restrainer precursors. Preferred azole compounds include benzotriazoles, triazoles, tetrazoles, indazoles and benzimidazoles. The azole compounds have an alkali-hydrolyzable, N,N-disubstituted carbamoyl group on one of the two nitrogen atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.