Preparation of photochromic gradient lenses

Details Preparation of photochromic gradient lenses Preparation of photochromic gradient lenses

1977-11-07

1979-05-15

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, 65111, 65115, 65119, 65DIG2, 106 52, 106DIG6, C03C 1500, C03B 3100

Patent

active

041545907

ABSTRACT:
Glass lenses or lens blanks, containing all the ingredients necessary to produce phototropic or photochromic behavior, are treated in a conventional production furnace to produce a locally variable heat treatment, wherein at least one portion thereof is raised to a temperature exceeding the glass strain point but not the softening point, and other portions are heated to variable temperatures decreasing from the strain point. The treatment causes development of phototropic or photochromic behavior only in those portions of the lenses or lens blanks exposed to the temperature above the strain point.

REFERENCES:
patent: 3419370 (1968-12-01), Cramer et al.
patent: 3795523 (1974-03-01), Moriya et al.
patent: 3833511 (1974-09-01), Yamashith et al.
patent: 3920463 (1975-11-01), Simms
patent: 3938977 (1976-02-01), Gliemeruth

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