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Electrowinning cell
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Patent number 6,017,428
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Issue date Jan 25, 2000
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Summit Valley Equipment and Engineering, Inc.
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Eldan L. Hill
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C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR
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Oven mercury retorting device
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Patent number 5,891,216
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Issue date Apr 6, 1999
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Summit Valley Equipment and Engineering, Inc.
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Charles H. Washburn
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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Rotating kiln seal
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Patent number 5,551,870
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Issue date Sep 3, 1996
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Summit Valley Equipment and Engineering
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Charles O. Gale
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F27 - FURNACES KILNS OVENS RETORTS