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US 4,223,540 AGranted
Dewar and removable refrigerator for maintaining liquefied gas inventory
AssigneeAir Products and Chemicals, Inc.
InventorRalph C. Longsworth
Life of this patent
Estimating the term…
Abstract
A cryostat for maintaining an inventory of a liquefied cryogen including a vacuum jacketed reservoir (Dewar) containing heat shields in the vacuum jacket, the heat shields cooled to different temperatures and a cryogen recondenser cooled by a cryogenic refrigerator. Included in the cryostat is an access passage to place objects in the cryogen and to support the refrigerator, the access passage including means to remove the refrigerator without opening the liquid cryogen to ambient atmosphere.
Claims10
A Cryostat comprising in combination:
- a vacuum jacketed reservoir for receiving and holding a supply of liquid cryogen including at least one means for access to said liquid cryogen from outside said reservoir;
- means in said vacuum jacket and said access means to intercept heat infiltrating into said reservoir;
- and
- refrigeration means to maintain said heat intercepting means at a temperature between that of the liquid cryogen and ambient and recondense liquid cryogen boil-off from said reservoir.
1 more element
A cryostat comprising in combination:
- a vacuum jacketed reservoir for receiving and holding a supply of liquid cryogen including at least one means for access to said liquid cryogen from outside said reservoir;
- said access means including a closure device exposed to ambient atmosphere;
- at least one heat station in said access means disposed between said liquid cryogen and said closure device of said access means;
- and
- refrigeration means disposed in said access means adapted to cool said heat station to a temperature between that of the liquid cryogen and ambient and condense cryogen boil-off from said reservoir.
2 more elements
Dependencies are inferred from the claim text.