Bridged spiroxazine photochromic compounds
US5446149A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Dec 2, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/685
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photochromic compounds having the following structure II ##STR1## in which R.sup.1 is a group selected from hydrogen, alkyl, alkoxy, amino, aryl or heteroaryl; PA1 each R.sup.2 is a group selected from C1 to C10 branched or linear alkyls, carbocylic or heterocyclic, the R.sup.2 groups can be independent or together from part of a carboxylic or heterocyclic ring; PA1 R.sup.3 is a group selected from hydrogen, alkyl, alkoxy, alkenyl, alkynyl, imino, azo, amino, carboxy ester, amide, cyano, halogen, trifluoromethyl, nitro, aryl or heteroaryl, R.sup.3 is a fused carbocyclic or heterocyclic moiety; PA1 Y is a six membered carbocyclic or heterocyclic ring. PA1 X links N as shown to the ring Y to form a fused heterocyclic ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.