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Thermally insulating jacket under reversible vacuum utilizing hydrogen getter in combination with non-evaporable promoter getter

  • US 5,625,742 A
  • Filed: 07/06/1994
  • Issued: 04/29/1997
  • Est. Priority Date: 07/08/1993
  • Status: Expired due to Term
First Claim
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1. A thermally insulating jacket under reversible vacuum, having an inner wall, an outer wall and an hollow space between said walls in fluid communication with an outer housing containing a reversible non-evaporable hydrogen getter loaded with hydrogen before use, wherein:

  • a) said reversible hydrogen getter has hydrogen equilibrium pressure px1 lower than 100 mbar at 500°

    C., when the hydrogen concentration in the getter is 0.1% by weight, and is kept at a variable or constant temperature Ti different from the temperature Tc of the hotter wall of the jacket;

    b) said hollow space contains a non-evaporable promoter getter having a hydrogen equilibrium pressure Px2 higher than 100 mbar at 500°

    C., when the hydrogen concentration in the getter is 0.1% by weight, which is exposed to a temperature Tc different from Ti.

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