Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including specific material of construction
Patent
1992-01-31
1994-04-26
Chaudhuri, Olik
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Including specific material of construction
1566171, 156DIG83, B01D 900
Patent
active
053064739
ABSTRACT:
A quartz glass crucible for pulling a single crystal, which comprises a cylindrical straight portion, a bottom portion and a curved intermediate portion for connecting the straight portion and the bottom portion. The straight portion has an opaque area positioned within about 75% or less of the total height of the crucible, measured from the upper open end of the crucible. The opaque area in the straight portion has a total bubble volume which ranges from about 7.times.10.sup.-3 cm.sup.3 /cm.sup.3 to 30.times.10.sup.-3 cm.sup.3 /cm.sup.3. The remaining straight portion, the curved intermediate portion and the bottom portion consist of two layers. One layer is an inner transparent layer having a total volume of bubbles of about 4.times.10.sup.-3 cm.sup.3 /cm.sup.3 or less and corresponds to from about 20% to 60% of the thickness of the crucible, measured from the inside surface thereof. The other layer is an outer opaque layer having a total volume of bubbles ranging between about 7.times.10.sup.-3 cm.sup.3 /cm.sup.3 and 30.times.10.sup.-3 cm.sup.3 /cm.sup.3, which is integral with the opaque area of the upper part of the straight portion.
REFERENCES:
patent: 4416680 (1983-11-01), Bruning et al.
patent: 4528163 (1985-07-01), Albrecht
patent: 4632686 (1986-12-01), Brown et al.
patent: 4956208 (1990-09-01), Uchikawa et al.
Hayashi Yuji
Nakajima Toshio
Tachibana Satoru
Takariki Kazuhiko
Chaudhuri Olik
Garrett Felisa
Toshiba Ceramics Co. Ltd.
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