Method of manufacturing solid glass preforms from hollow preforms
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United States of America Patent
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May 24, 1988
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N/A
app pub date -
Oct 2, 1986
filing date -
Jul 13, 1984
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Expired
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Abstract
Solid glass preforms are made by externally heating a tubular preform by a plasma which is reciprocated along the hollow tube. The plasma gas consists entirely or partly of a molecular gas (N.sub.2 or O.sub.2, for example). The hollow preform is preferably rotated during collapsing.
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