Apparatus for crystal pulling
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United States of America Patent
Stats
-
Feb 4, 1997
Grant Date -
N/A
app pub date -
Aug 28, 1991
filing date -
Jul 4, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lock valve disposed between a pulling pot and a lock chamber is opened at the start of the pulling process and thereby uncovers a lock entrance for the crystal that is to be pulled, and together with a gasket closes the lock entrance after the end of the pulling process and thereby hermetically separates the pulling pot from the lock chamber. The gasket (9) is protected during the pulling of the crystal by a guard (15, 16) against the thermal radiation of the hot crystal.
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