Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1984-09-05
1987-08-11
Jiles, Henry R.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351 44, 351166, 350586, 549 41, 549 42, 549 44, 549 60, 548407, 252586, C07D30760, C07D40506, C09K 900, G03C 1733
Patent
active
046857834
ABSTRACT:
A series of photochromic compounds are disclosed which have the property of undergoing a reversible color change when exposed to unfiltered sunlight and reverting to their original color in the absence of U.V. light at room temperature. These compounds have the general formula: ##STR1## represents an adamantylidene or a substituted adamantylidene group;
REFERENCES:
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4220708 (1980-09-01), Heller
Darcy Paul J.
Heller Harold H.
Johncock William
Oliver Stephen N.
Trundle Clive
Jiles Henry R.
Mullins J. G.
The Plessey Company P.L.C.
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