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Soil heat exchanger
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Patent number 5,937,934
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Issue date Aug 17, 1999
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Geohil AG
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Hans Hildebrand
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F24 - HEATING RANGES VENTILATING
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-
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3800865
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Patent number 3,800,865
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Issue date Apr 2, 1974
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F28 - HEAT EXCHANGE IN GENERAL
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2994914
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Patent number 2,994,914
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Issue date Aug 8, 1961
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1846608
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Patent number 1,846,608
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Issue date Feb 23, 1932
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F28 - HEAT EXCHANGE IN GENERAL
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1630148
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Patent number 1,630,148
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Issue date May 24, 1927
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F22 - STEAM GENERATION
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1462695
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Patent number 1,462,695
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Issue date Jul 24, 1923
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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1151675
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Patent number 1,151,675
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Issue date Aug 31, 1915
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1030203
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Patent number 1,030,203
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Issue date Jun 18, 1912
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F28 - HEAT EXCHANGE IN GENERAL
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827495
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Patent number 827,495
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Issue date Jul 31, 1906
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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722366
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Patent number 722,366
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Issue date Mar 10, 1903
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F28 - HEAT EXCHANGE IN GENERAL
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514690
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Patent number 514,690
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Issue date Feb 13, 1894
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F28 - HEAT EXCHANGE IN GENERAL
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506384
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Patent number 506,384
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Issue date Oct 10, 1893
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F28 - HEAT EXCHANGE IN GENERAL
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498775
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Patent number 498,775
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Issue date Jun 6, 1893
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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216111
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Patent number 216,111
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Issue date Jun 3, 1879
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F28 - HEAT EXCHANGE IN GENERAL
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150002
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Patent number 150,002
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Issue date Apr 21, 1874
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL