Device for maintaining a vacuum in a thermally insulating jacket and method of making such device
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Jul 7, 1994
priority date (Note) -
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Abstract
A device for maintaining a vacuum in a thermally insulating jacket is described. The device comprises a container formed of a gas-tight material, preferably aluminum, which has an opening to the atmosphere. Inside the container is a first pellet comprising a powder of a Ba--Li alloy getter material. Arranged above, and completely covering, the first pellet is a second pellet comprising a powder of a drying material, optionally including the oxide of a noble metal and a material to prevent contraction of the drier. A process for manufacturing such a device is also described in which the first pellet is obtained by compression of its constituent powders at a pressure between about 30 bar and 1000 bar.
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