Photochromic article
US4909963A · kind A · utility
11Cited by
12References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Dec 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are photochromic spiro(indoline)benzoxazine compounds having substituents on the benzoxazine portion of the compound, and their use in plastic hosts to impart a photochromic response thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.