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Refrigerant recovery unit
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Patent number 5,537,836
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Issue date Jul 23, 1996
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William H. Ricketts
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Automatic charge refrigerant transfer system
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Patent number 5,406,806
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Issue date Apr 18, 1995
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RSB Engineers/Planners, Inc.
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William H. Ricketts
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Refrigerant recovery system
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Patent number 5,230,224
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Issue date Jul 27, 1993
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RSB Engineers/Planners, Inc.
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William H. Ricketts
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...