Patent ID: RE42467

Claim:
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 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.