TREA

David W. Francisco

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  • Beatty, NV, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Fire refining precious metals asay method
    • Patent number 5,279,644
    • Issue date Jan 18, 1994
    • ASARCO Incorporated
    • David W. Francisco
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...