Thermally insulating jacket and related process
AssigneeSaes Getters S.P.A.
InventorsClaudio Boffito, Antonio Schiabel, Allessandro Gallitognotta
Life of this patent
Estimating the term…
Abstract
Improved process for evacuating the thermally insulating jacket of a dewar having an inner wall and an outer wall, with the inner space between said walls completely or partially filled with an insulating material, containing also a moisture sorbing material and a getter material, in which said moisture sorbing material is a chemical drying agent.
Claims20
A process for producing an improved thermally insulating jacket, having an inner wall and an outer wall, and having an inner space between said walls containing an insulating material, wherein said inner space also contains a moisture sorbing material and a getter material, wherein said moisture sorbing material is a moisture sorbing material, having a H.sub.2 O vapor pressure lower than 1 Pa at room temperature, characterized by the following steps:
- A. evacuating the inner space of the jacket down to a pressure lower than 100 Pa by means of a vacuum pump having a connection between the pump and the inner space of the jacket;
- B. exposing said inner space contemporaneously to said moisture sorbing material while keeping the getter in an inactivated form;
- C. evacuating said inner space farther, down to a pressure lower than 5 Pa, by means of the vacuum pump;
- D. activating said getter;
- and
- E. isolating the jacket from the vacuum pump, by sealing the connection between said vacuum pump and the inner space of the jacket.
An improved thermally insulating jacket, having an inner wall and an outer wall, and having an inner space between said walls completely or partially filled with an insulating material, wherein said inner space also contains:
- A. a moisture sorbing material selected from the group consisting of barium oxide, strontium oxide, phosphorous oxide, and mixtures thereof;
- and
- B. a getter material which is an alloy of the formula BaLi.sub.4.
An improved thermally insulating jacket, having an inner wall and an outer wall, and having an inner space between said walls completely or partially filled with an insulating material, wherein said inner space also contains:
- A. a moisture sorbing material selected from the group consisting of barium oxide, strontium oxide, phosphorous oxide, and mixtures thereof;
- and
- B. a getter material which is an alloy of the formula BaLi.sub.4 ;
- and
- C. a hydrogen converter selected from the group consisting of osmium oxide, iridium oxide, ruthenium oxide, rhodium oxide and palladium oxide.
An improved thermally insulating jacket, having an inner wall and an outer wall, and having an inner space between said walls completely or partially filled with an insulating material, wherein said inner space also contains:
- A. a moisture sorbing material which is barium oxide;
- and
- B. a getter material which is an alloy of the formula BaLi.sub.4 ;
- and
- C. a hydrogen converter which is palladium oxide.
Dependencies are inferred from the claim text.