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Multi-layer ceramic filter
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Patent number 4,981,589
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Issue date Jan 1, 1991
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Valmet Paper Machinery Inc.
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Rolf Hindstrom
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Filter leaf
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Patent number 4,968,423
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Issue date Nov 6, 1990
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The Duriron Company, Inc.
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Gary W. McKale
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Filtration of liquors
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Patent number 4,128,480
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Issue date Dec 5, 1978
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Alcan Research and Development Limited
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John R. Lumsden
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3774772
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Patent number 3,774,772
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Issue date Nov 27, 1973
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL