Compositions – Light transmission modifying compositions – Displaying color change
Patent
1997-08-04
2000-09-05
Tucker, Philip
Compositions
Light transmission modifying compositions
Displaying color change
549383, 549414, 549457, 544149, 544378, 546214, G02B 523, C07D30777
Patent
active
061138126
ABSTRACT:
A photochromic article that includes a host material and a photochromic amount of a benzopyran compound, the benzopyran compound represented by one of the formulas: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are selected from hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound.
REFERENCES:
patent: 3567607 (1971-03-01), Saunders et al.
patent: 4882438 (1989-11-01), Tanaka et al.
patent: 4931221 (1990-06-01), Heller
patent: 4994208 (1991-02-01), McBain et al.
patent: 5066818 (1991-11-01), Gemert et al.
patent: 5106998 (1992-04-01), Tanaka et al.
patent: 5238981 (1993-08-01), Knowles
patent: 5244602 (1993-09-01), Van Gemert
patent: 5274132 (1993-12-01), VanGemert
patent: 5411679 (1995-05-01), Kumar
patent: 5527911 (1996-06-01), Gugliemetti et al.
patent: 5869662 (1999-02-01), Hughes
Chemical Abstracts 122:302634, (1994).
Tucker Philip
Vision--Ease Lens, Inc.
LandOfFree
Photochromic articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photochromic articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photochromic articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2208779