Photographic element containing yellow filter dyes having tricyanovinyl groups
US4861700A · kind A · utility
14Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Nov 19, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements comprising filter dyes of the formula: ##STR1## wherein A is a pyrrole or indole nucleus, with the tricyanovinyl radical occupying the 2 or 3 position of the nucleus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.