Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1978-09-08
1980-07-29
Schafer, Richard E.
Compositions
Inorganic luminescent compositions
Tungsten containing
350354, 544 71, 430345, 252600, G02B 523, G02B 104, C07D26538
Patent
active
042150108
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, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen 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.
Chu Nori Y. C.
Fuchsman Charles H.
Hovey Richard J.
Piusz Peter G.
American Optical Corporation
Duggan Jeremiah J.
Kyle Deborah L.
Schafer Richard E.
Schneeberger Stephen A.
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