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Method of purifying and recycling argon
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Patent number 6,685,903
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Issue date Feb 3, 2004
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Praxair Technology, Inc.
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Kenneth K. Wong
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Cryogenic refrigeration system
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Patent number 6,425,264
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Issue date Jul 30, 2002
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Praxair Technology, Inc.
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Kenneth Kai Wong
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Annular column for cryogenic rectification
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Patent number 6,023,945
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Issue date Feb 15, 2000
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Praxair Technology, Inc.
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Kenneth Kai Wong
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Annular column for cryogenic rectification
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Patent number 5,946,942
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Issue date Sep 7, 1999
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Praxair Technology, Inc.
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Kenneth Kai Wong
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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