Process for preparing a surface darkened glass

Details Process for preparing a surface darkened glass Process for preparing a surface darkened glass

1990-07-25

1991-09-03

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 13, 501 65, 65 3011, 65 323, 313534, C03C 3091, C03C 2300, C03B 3200

Patent

active

050455109

ABSTRACT:
A process for preparing a surface-darkened glass is disclosed. In the first step of this process, a specified silicate glass which contains a minor amount of antimony trioxide is provided. Thereafter, this glass is heated to a temperature of from about 350 to about 1,000 degrees Celsius while being contacted with hydrogen-containing gas. The presence of the antimony trioxide in the glass facilitates the darkening of its surface.

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patent: 3449103 (1969-06-01), Stookey
patent: 3689242 (1972-09-01), Platakis et al.
patent: 3756798 (1973-09-01), Ernsberger
patent: 4065283 (1977-12-01), Asahara et al.
patent: 4130680 (1978-12-01), Ference et al.
patent: 4240836 (1980-12-01), Borrelli et al.
patent: 4475059 (1984-10-01), Sink
patent: 4613786 (1986-09-01), Holland et al.

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