Photochromic compound and articles containing the same
US4936995A · kind A · utility
25Cited by
7References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 17, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | May 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/685
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel spiro(benzindolino) benzoxazine compounds and compositions containing such compounds. Photochromic sprio(benzindolino) benzoxazines may be incorporated into plastic host materials to produce photochromic articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.