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Hajime Sudo
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Machida, JP
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last 30 patents
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Patent Grant
Process for producing niobium metal of an ultrahigh purity
Patent number
4,720,300
Issue date
Jan 19, 1988
Toyo Soda Manufacturing Co., Ltd.
Keiichiro Nishizawa
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...