Photochromic spirooxazine compounds, their use in the field of ophthalmic optics
US6019914A · kind A · utility
34Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Sep 9, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D498/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The new photochromic compounds according to the invention, of the spiro[indoline-[2,3']-benzoxazine] type, include at least one electron-withdrawing group attached to the benzoxazine structure in 5' or 6' position by a chain containing at least one ethylenic double bond. Application to ophthalmic optics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.