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2926994
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Patent number 2,926,994
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Issue date Mar 1, 1960
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C01 - INORGANIC CHEMISTRY
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2329161
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Patent number 2,329,161
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Issue date Sep 7, 1943
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C01 - INORGANIC CHEMISTRY
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2290070
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Patent number 2,290,070
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Issue date Jul 14, 1942
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C01 - INORGANIC CHEMISTRY
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1916797
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Patent number 1,916,797
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Issue date Jul 4, 1933
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C01 - INORGANIC CHEMISTRY