based glass
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United States of America Patent
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Oct 31, 2017
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app pub date -
Dec 24, 2014
filing date -
Jun 27, 2012
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Abstract
A method for manufacturing an SiO2—TiO2 based glass upon a target by a direct method, includes a first process of preheating the target and a second process of growing an SiO2—TiO2 based glass ingot to a predetermined length upon the target which has been preheated, wherein the target is heated in the first process such that, in the second process, the temperature of growing surface of the glass ingot is maintained at or above a predetermined lower limit temperature.
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