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3894927
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Patent number 3,894,927
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Issue date Jul 15, 1975
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3836634
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Patent number 3,836,634
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Issue date Sep 17, 1974
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C01 - INORGANIC CHEMISTRY
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3607013
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Patent number 3,607,013
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Issue date Sep 21, 1971
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C01 - INORGANIC CHEMISTRY
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3471250
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Patent number 3,471,250
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Issue date Oct 7, 1969
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...