Liquefying and storing a gas

Details Liquefying and storing a gas Liquefying and storing a gas

2008-01-15

2008-01-15

Doerrler, William C (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

C062S006000, C128S201210

Reexamination Certificate

active

07318327

ABSTRACT:
Apparatus and methods for improving the safety and efficiency and decreasing the cost of producing liquid oxygen with a small-scale use liquefaction device, according to various embodiments of the present invention. In one embodiment, a switch is electrically coupled to a storage dewar pressurizing means, the switch positioned to be activated by a portable dewar upon engagement of portable dewar with storage dewar. Cryocooler and/or cooling fan enter low power mode when dewar liquid level reaches a predetermined level, and to return to a fall power mode when dewar liquid level drops to another predetermined level. A cold finger of the cryocooler extends within the dewar and may prevent overfilling of the dewar. The cold finger has a temperature gradient. As the gas liquefies and fills the dewar, the liquid level rises only to a level on the cold finger at which the temperature exceeds the boiling point of oxygen.

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Author Unkown, “Air Liquide- Bulk Gases.” www.airliquide.com, date unknown.
Author Unkown, “Praxair, Inc.—Oxygen Therapy for Infants, Children and Adults.” www.praxair.com, date unknown.
Author Unkown, “Praxair, Inc.—Cyrogenic On-site Air Separation Plants.” www.praxair.com, date unknown.

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