QUARTZ GLASS CRUCIBLE
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United States of America Patent
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Issued Date -
Apr 23, 2020
app pub date -
Jun 11, 2018
filing date -
Jul 4, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
In an exemplary embodiment, a quartz glass crucible 1 includes: a straight body portion 1a having a cylindrical shape; a bottom portion 1b; and a corner portion 1c, in which a bubble content of an inner surface layer portion ranging from an inner surface to a depth 0.5 mm in an upper portion 1a1 of the straight body portion 1a is 0.2% to 2%, the bubble content of the inner surface layer portion in a lower portion 1a2 of the straight body portion 1a is more than 0.1% and not more than 1.3 times a lower limit of the bubble content of the upper portion 1a1, the bubble content of the inner surface layer portion in the corner portion 1c is more than 0.1% and 0.5% or less, and the bubble content of the inner surface layer portion in the bottom portion 1b is 0.1% or less.
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