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Cryopump and method of operating same
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Patent number 4,667,477
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Issue date May 26, 1987
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Hitachi, Ltd.
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Toshiharu Matsuda
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Cryogenic cooling apparatus
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Patent number 4,432,216
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Issue date Feb 21, 1984
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Hitachi, Ltd.
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Toshiharu Matsuda
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Air conditioning system
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Patent number 4,230,470
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Issue date Oct 28, 1980
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Hitachi, Ltd.
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Toshiharu Matsuda
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Reverse-flow air conditioner
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Patent number 4,106,307
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Issue date Aug 15, 1978
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Hitachi, Ltd.
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Toshiharu Matsuda
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F24 - HEATING RANGES VENTILATING