04367170 is referenced by 118 patents and cites 8 patents.

Organic photochromic materials comprising a photochromic dye and a resinous material can be stabilized with a protective coating which will protect them from deactivation by exposure to moisture, oxygen, various plastic host materials, reactive chemicals or even normal atmospheric conditions. Useful organic photochromic dyes include the spiropyrans, the spirooxazines, the metal dithizonates, the phenazines, the phenothiazines and other known photochromic compositions. Useful resinous materials include vinyl-type thermoplastics, cellulosic materials, polyesters, epoxy resins and aminoplast resins. The encapsulated photochromic materials of the invention comprise an organic photochromic dye in combination with an organic resinous material enclosed within an outer shell of an inorganic material and find use in the preparation of photochromic plastic films, sheets, ophthalmic lenses such as lenses for sunglasses and in camera lenses and filters.

Title
Stabilized photochromic materials
Application Number
5/543711
Publication Number
4367170
Application Date
January 24, 1975
Publication Date
January 4, 1983
Inventor
Nori Y C Chu
Southbridge
MA, US
Richard J Hovey
Sturbridge
MA, US
Elias Snitzer
Wellesley
MA, US
Donald R Uhlmann
Newton
MA, US
Agent
Kenway and Jenney
Assignee
American Optical Corporation
MA, US
IPC
G02B 5/23
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