Vacuum-insulating system and method for generating a high-level vacuum
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United States of America Patent
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Nov 20, 2007
Grant Date -
Sep 22, 2005
app pub date -
Mar 16, 2004
filing date -
Mar 16, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of generating a high-level vacuum comprises evacuating a chamber having a substantially-pure gas therein to a medium-level vacuum, and freezing the residual gas to generate the high-level vacuum within the chamber. Impurities, such as atmospheric air, may be purged from the chamber by evacuating the chamber to a medium level vacuum (e.g., around 10.sup.-2 Torr) and subsequently filling the chamber with the gas. This purging process may be repeated multiple times to decrease the level of impurities in the gas filling the chamber. The substantially-pure gas may have an impurity-level of less than approximately 100 PPM and may comprise carbon-dioxide, although the scope of the invention is not limited in this respect. The medium level vacuum may range between approximately 1.times.10.sup.-2 Torr and 5.times.10.sup.-2 Torr allowing the use of a roughing pump, and the high-level vacuum may range between approximately 1.times.10.sup.-5 and 1.times.10.sup.-8 Torr.
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