Process for increasing the strength of sealing glass

Details Process for increasing the strength of sealing glass Process for increasing the strength of sealing glass

1975-06-26

1976-08-17

Powell, William A.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 36, 156 3, 156 24, C03C 1500

Patent

active

039751759

ABSTRACT:
The strength of high lead or alkaline earth oxide sealing glass articles is increased by treating the surface of the articles with a solution of dilute nitric acid containing about 1-10 weight percent of concentrated nitric acid in water for the time necessary to remove a thin layer of material from the surface of the article.
The purpose of this abstract is to enable the public and the Patent Office to rapidly determine the subject matter of the technical disclosure of the application. This abstract is neither intended to define the invention of the application nor is it intended to be limiting as to the scope thereof.

REFERENCES:
patent: 2852352 (1958-09-01), Landron, Jr.
patent: 3023139 (1962-02-01), Van Tetterode
patent: 3281294 (1966-10-01), Martin
patent: 3647583 (1972-03-01), De Rouw
patent: 3885974 (1975-05-01), Asahara et al.
patent: 3898092 (1975-08-01), Rea

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