Title: Radio frequency preparation of pure glass

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Claims: What is claimed is:

1. A method of preparing glass including placing glass batch materials in a crucible, inserting an encapsulated contamination-free susceptor into the crucible, applying a radio frequency field to heat the susceptor to melt the glass, removing the susceptor and applying said radio frequency field to further heat the melt for fining and homogenizing the glass, and cooling the crucible with liquid to provide a lower temperature than the melt to prevent the melt from wetting the crucible.

2. The method as claimed in claim 1 wherein the crucible is made of silica and includes a water jacket, cooling water being passed through the jacket over the base of the crucible.

3. The method as claimed in claim 1 wherein the susceptor is positioned in the batch material in the crucible during preheating.

4. The method as claimed in claim 1 wherein the susceptor is of silica encapsulated graphite.
Other info:

Inventors: Stewart, Clive Edward Ernest (Bishops Stortford, EN)

Application Number: 494155
Filing Date: 1974-08-02
Publication_date: 1976-02-10
Assignee: International Standard Electric Corporation (New York, NY)
Primary Class(es): 65/135.6 65/136.4, 65/337, 373/34
Other Classes:
US Patent Ref:

1034824	Aug, 1912	Owens	65/337.
1572873	Feb, 1926	Allcutt	65/DIG.
2186718	Jan, 1940	Ferguson	13/6.
2402582	Jun, 1946	Scaff	65/137.
2749379	Jun, 1956	Geffcken et al.	13/6.
2877280	Mar, 1959	Eden	65/DIG.
2930098	Mar, 1960	Emeis	65/DIG.
3156549	Nov, 1964	Kelemen	13/6.
3205292	Sep, 1965	Descarsin	65/DIG.
3337675	Aug, 1967	Descarsin	13/6.

Other Refs:
Primary Examiner: Bashore, S. Leon
Assistant Examiner: Miga, Frank W.
Attorney: O'Halloran; John T., Lombardi, Jr.; M. J.