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Ultrasonic grain refining
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Patent number 10,441,999
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Issue date Oct 15, 2019
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HANS TECH, LLC
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Qingyou Han
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B22 - CASTING POWDER METALLURGY
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Ultrasonic grain refining
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Patent number 9,481,031
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Issue date Nov 1, 2016
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HANS TECH, LLC
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Qingyou Han
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B22 - CASTING POWDER METALLURGY
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3835740
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Patent number 3,835,740
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Issue date Sep 17, 1974
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3776295
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Patent number 3,776,295
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Issue date Dec 4, 1973
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B22 - CASTING POWDER METALLURGY
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3771587
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Patent number 3,771,587
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Issue date Nov 13, 1973
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B22 - CASTING POWDER METALLURGY
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3770046
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Patent number 3,770,046
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Issue date Nov 6, 1973
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B22 - CASTING POWDER METALLURGY
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3736980
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Patent number 3,736,980
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Issue date Jun 5, 1973
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B22 - CASTING POWDER METALLURGY
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3702630
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Patent number 3,702,630
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Issue date Nov 14, 1972
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B22 - CASTING POWDER METALLURGY
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3693701
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Patent number 3,693,701
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Issue date Sep 26, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3625276
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Patent number 3,625,276
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Issue date Dec 7, 1971
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B22 - CASTING POWDER METALLURGY
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3598173
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Patent number 3,598,173
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Issue date Aug 10, 1971
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B22 - CASTING POWDER METALLURGY
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3583469
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Patent number 3,583,469
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Issue date Jun 8, 1971
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B22 - CASTING POWDER METALLURGY
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3445922
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Patent number 3,445,922
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Issue date May 27, 1969
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3430684
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Patent number 3,430,684
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Issue date Mar 4, 1969
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B22 - CASTING POWDER METALLURGY
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3416591
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Patent number 3,416,591
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Issue date Dec 17, 1968
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B22 - CASTING POWDER METALLURGY
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3367400
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Patent number 3,367,400
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Issue date Feb 6, 1968
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B22 - CASTING POWDER METALLURGY
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3353587
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Patent number 3,353,587
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Issue date Nov 21, 1967
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B22 - CASTING POWDER METALLURGY
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3268959
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Patent number 3,268,959
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Issue date Aug 30, 1966
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B22 - CASTING POWDER METALLURGY
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3040396
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Patent number 3,040,396
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Issue date Jun 26, 1962
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B22 - CASTING POWDER METALLURGY