Making colored photochromic glasses

Details Making colored photochromic glasses Making colored photochromic glasses

1990-04-16

1990-12-25

Lindsay, Robert L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 323, 501 13, C03C 406

Patent

active

049799762

ABSTRACT:
This invention is directed to a method for making tinted photochromic glass articles having an integral reduced surface layer exhibiting color, the glass utilizing silver halide crystals as the photochromic agent. The method generally comprises heat treating the glass article in a heating chamber in an atmosphere of flowing hydrogen at temperatures below 500.degree. C. The specific steps of the inventive method comprise:

REFERENCES:
patent: 3920463 (1975-11-01), Simms
patent: 4240836 (1980-12-01), Borrelli et al.
patent: 4498919 (1985-02-01), Mann
patent: 4832724 (1989-05-01), Borrelli et al.

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