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US 4,047,971 AGranted
Method for treating a glass surface
AssigneeFujitok Co., Ltd.
InventorsHiroaki Yanagida, Tsuneo Ohashi
Life of this patent
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Abstract
A surface treating process for alkali glass to prevent "whitening" thereof. The method comprises bringing the surface of glass into contact with an aqueous solution containing one or more metal nitrates, the nitrate being of a metal selected from the group consisting of iron, nickel, chromium and cobalt.
Claims6
A method for treating a solid alkali glass surface to prevent whitening thereof comprising the steps of:
- pre-cleaning said glass surface;
- bringing said pre-cleaned glass surface to contact with an aqueous solution containing one or more metal nitrates selected from the group consisting of nitrates of iron, nickel, chromium and cobalt in amounts effective to prevent whitening of said glass surface;
- and
- immediately thereafter post-cleaning said metal nitrate treated glass surface.
1 more element
Dependencies are inferred from the claim text.