Quartz glass crucible

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 12116692
SERIAL NO

17413925

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Abstract

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A quartz glass crucible 1 having a cylindrical side wall portion 10a, a bottom portion 10b, and a corner portion 10c connecting the side wall portion 10a and the bottom portion 10b to each other includes a transparent layer 11 made of quartz glass, and a bubble layer 12 made of quartz glass and formed outside the transparent layer 11. A ratio of an infrared transmittance of the corner portion 10c at a maximum thickness position of the corner portion 10c to an infrared transmittance of the side wall portion 10a is 0.3 or more and 0.99 or less, and an absolute value of a rate of change in infrared transmittance in a height direction along a wall surface of the crucible from a center of the bottom portion 10b toward an upper end of the side wall portion 10a is 3%/cm or less.

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Patent Owner(s)

Patent OwnerAddress
SUMCO CORPORATION2-1 SHIBAURA 1-CHOME MINATO-KU TOKYO 105-8634
SHIN-ETSU QUARTZ PRODUCTS CO LTDSHINJUKU SAN-EI BLDG 1-22-2 NISHI-SHINJUKU SHINJUKU-KU TOKYO 160-0023

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujita, Takeshi Akita, JP 268 3417
Katano, Tomokazu Tokyo, JP 7 12
Kitahara, Eriko Akita, JP 20 35
Kitahara, Ken Akita, JP 29 92

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