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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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3083829
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Patent number 3,083,829
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Issue date Apr 2, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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3036626
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Patent number 3,036,626
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Issue date May 29, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2858020
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Patent number 2,858,020
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Issue date Oct 28, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2815292
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Patent number 2,815,292
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Issue date Dec 3, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2570835
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Patent number 2,570,835
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Issue date Oct 9, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2548340
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Patent number 2,548,340
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Issue date Apr 10, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2485857
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Patent number 2,485,857
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Issue date Oct 25, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2183763
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Patent number 2,183,763
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Issue date Dec 19, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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2085538
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Patent number 2,085,538
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Issue date Jun 29, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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2049071
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Patent number 2,049,071
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Issue date Jul 28, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1922489
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Patent number 1,922,489
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Issue date Aug 15, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1629182
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Patent number 1,629,182
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Issue date May 17, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE