Gradient photochromic lens and method selectively reducing photo

Details Gradient photochromic lens and method selectively reducing photo Gradient photochromic lens and method selectively reducing photo

1980-09-02

1981-09-15

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Nontextile, dyeing process or product, including inorganic...

8519, 252300, 350353, 350354, 350438, 544 71, D06P 500

Patent

active

042894972

ABSTRACT:
A new gradient photochromic lens having a uniform resistance to fatigue is disclosed. A method for selectively reducing photochromic activity in one or more portions of a lens having a photochromic dye uniformly disposed across the surface thereof is also disclosed.

REFERENCES:
patent: 3212898 (1965-10-01), Cerreta
patent: 3562171 (1971-02-01), Ono et al.
patent: 3578602 (1971-05-01), Ono et al.
patent: 3666352 (1972-05-01), Wagner et al.
patent: 4043637 (1977-04-01), Hovey
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4245991 (1981-01-01), Haddad et al.

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