Compositions – Light transmission modifying compositions – Displaying color change
Patent
1980-07-28
1982-08-03
Kyle, Deborah L.
Compositions
Light transmission modifying compositions
Displaying color change
350354, 544 71, G02B 523, G02B 104, C07D26538
Patent
active
043426689
ABSTRACT:
Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and R.sub.5 is an alkyl of 2 to 10 carbons, and their use in lenses are disclosed.
REFERENCES:
patent: 3562172 (1971-02-01), Ono et al.
patent: 3578602 (1971-05-01), Ono et al.
patent: 4046586 (1977-09-01), Uhlmann et al.
patent: 4215010 (1980-07-01), Hovey et al.
Chu Nori Y. C.
Fuchsman Charles H.
Hovey Richard J.
Piusz Peter G.
American Optical Corporation
Kyle Deborah L.
Spencer Alan H.
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