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Method of producing sodium bentonite
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Patent number 9,676,669
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Issue date Jun 13, 2017
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King Fahd University of Petroleum & Minerals
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Musaab Ibrahim Magzoub
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B28 - WORKING CEMENT, CLAY, OR STONE
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Purified attapulgite clay
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Patent number 6,444,601
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Issue date Sep 3, 2002
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ITC, Inc.
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Robert Joseph Purcell
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B28 - WORKING CEMENT, CLAY, OR STONE
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3395895
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Patent number 3,395,895
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Issue date Aug 6, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3034859
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Patent number 3,034,859
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Issue date May 15, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2956753
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Patent number 2,956,753
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Issue date Oct 18, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2535647
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Patent number 2,535,647
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Issue date Dec 26, 1950
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B28 - WORKING CEMENT, CLAY, OR STONE
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2173975
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Patent number 2,173,975
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Issue date Sep 26, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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1591915
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Patent number 1,591,915
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Issue date Jul 6, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE