1975-10-06
1977-08-23
Sikes, William L.
G02F 117
Patent
active
040436373
ABSTRACT:
A lens having an optical density which is variable under differing light conditions can be produced by imbibing a synthetic polymer lens such as a polycarbonate or diethylene diglycol bis allyl carbonate polymer with a solution of a metal dithizonate. A polarizing sheet can be laminated thereto or alternatively, a passive dye can be utilized on the inner surface of the lens to provide non-variable reduced optical density in the assembly.
REFERENCES:
patent: 3475339 (1969-10-01), Foster et al.
patent: 3485764 (1969-12-01), Kazan
patent: 3508810 (1970-04-01), Baltzer
patent: 3540793 (1970-11-01), Araujo et al.
patent: 3666352 (1972-05-01), Wagner et al.
Meriwether et al. "The Photochromism of Metal Dithizonates, " J. Am. Chem. Soc., vol. 87 (Oct. 20, 1965) pp. 4441-4448.
American Optical Corporation
Berkenstock, Jr. H. R.
Nealon William C.
Sikes William L.
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