Photochromic mercury complexes of asymmetrical diarylthiocarbazones
US4170567A · kind A · utility
18Cited by
2References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 1977 |
| Grant date | Oct 9, 1979 |
| Priority date | — |
| Expiry date | May 12, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Light fatigue resistant, non-orange, photochromic mercury complexes of asymmetrical diarylthiocarbazones for use in making photochromic sunglass lenses, ski goggles, and the like. The compounds comprise the class of mono and bis mercury diarylthiocarbazonates wherein one aryl group is an aryl group substituted at the ortho position with an electron withdrawing group such as CF.sub.3 and the other aryl group is different from the first and can comprise variously substituted or unsubstituted phenyl or naphthyl groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.