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William N. Johnson
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Ridgefield, CT, US
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last 30 patents
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Patent Grant
Extraction of tungsten from spent or scrap catalyst materials
Patent number
4,508,701
Issue date
Apr 2, 1985
Union Carbide Corporation
John B. Goddard
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...