Oxatellurazolium and oxatellurazinium compounds
US4831136A · kind A · utility
2Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Aug 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Compounds containing an aromatic ring portion fused with a tellurazolium or derivative tellurazole, tellurazoline (including tellurazolinylidene), or tellurazolinium ring portion are disclosed together with processes and intermediates for their preparation. With properly selected pendant groups these tellurazolium and derivative compounds can be usefully employed as dyes, antifoggants or stabilizers, nucleating agents, latent image keeping addenda, or speed or contrast altering addends in silver halide photographic systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.