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Stephen M. Cottam
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Bountiful, UT, US
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last 30 patents
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Patent Grant
Method of producing metallic lead and silver from their sulfides
Patent number
3,961,941
Issue date
Jun 8, 1976
Hecla Mining Company
Richard D. Baker
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...