Refrigeration – Processes – Packaging
Patent
1999-02-10
2000-09-19
Doerrler, William
Refrigeration
Processes
Packaging
62371, 62 451, B65B 6308, F25D 308
Patent
active
061194654
ABSTRACT:
A disposable shipping container for storing materials at cryogenic temperatures with: a specimen holding chamber, an open cell plastic foam material surrounding the specimen holding chamber for holding liquid nitrogen in suspension, a plurality of insulating and cushioning materials surrounding the plastic foam, a removable and replaceable primary cap for enclosing the specimen holding chamber allowing for the insertion and removal of the specimen from the specimen holding chamber and for adding liquid nitrogen to the plastic foam. A secondary removable and replaceable cap covers the primary cap. A preferred embodiment includes a specimen holding chamber that is comprised of a resin impregnated paper cylinder at its top half and a similarly sized stainless steel mesh screen cylinder attached to the lower edge of the paper cylinder at the specimen holders bottom half. The stainless steel cylinder has an attached stainless steel mesh floor at its lower most portion. The first and second rigid surrounding walls are joined at their top most portion and continue perpendicularly at their bottom most portions thereby forming a standard vacuum vessel. The plenum created by the first and second rigid walls contain an amount of either carbon dioxide or water vapor so that when liquid nitrogen is introduced to the plastic foam, the low temperature of the surrounding liquid nitrogen causes a vacuum to be created within the first and second rigid surrounding walls.
REFERENCES:
patent: 4729494 (1988-03-01), Peillon et al.
patent: 4821907 (1989-04-01), Castles et al.
patent: 5355684 (1994-10-01), Guice
Emmel Gregg
Mullens Patrick L.
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