Photochromic compound and articles containing the same
US4931219A · kind A · utility
118Cited by
6References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Jun 12, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K9/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are spiro (benzidoline) pyrido benzoxazine and spiro (benzindoline) naphthoxazine photochromic compounds and their use in plastic hosts to impact a photochromic response thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.