Quartz glass crucible

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11821103
APP PUB NO 20210310151A1
SERIAL NO

17267283

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A quartz glass crucible including a bottom portion, a curved portion, and a straight body portion, where the quartz glass crucible includes an outer layer including opaque quartz glass containing bubbles therein, and an inner layer including transparent quartz glass, the outer layer includes a plurality of layers in a part of the straight body portion, out of the plurality of layers, one layer having a devitrification spot number of 50/cm3 or more and 70/cm3 or less when the quartz glass crucible is heated at 1600° C. for 24 hours, and a layer positioned inwards of the devitrifiable layer in a thickness direction of the quartz glass crucible is a low devitrification layer having a spot number of 2/cm3 or less when the quartz glass crucible is heated at 1600° C. for 24 hours. This provides a quartz glass crucible suppressed from deformation due to heating and excessive progression of devitrification.

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First Claim

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Patent Owner(s)

  • SHIN-ETSU QUARTZ PRODUCTS CO., LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Baba, Yuji Takefu, JP 20 212

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