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Fire-resistant gypsum fiberboard
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Patent number 6,299,970
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Issue date Oct 9, 2001
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Georgia-Pacific Gypsum Corporation
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Turner W. Richards
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B28 - WORKING CEMENT, CLAY, OR STONE
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Methods of preparing fire doors
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Patent number 5,798,010
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Issue date Aug 25, 1998
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Georgia-Pacific Corporation
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Turner W. Richards
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B28 - WORKING CEMENT, CLAY, OR STONE
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Gypsum fiberboard door frame
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Patent number 5,347,780
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Issue date Sep 20, 1994
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Georgia-Pacific Corporation
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Turner W. Richards
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B28 - WORKING CEMENT, CLAY, OR STONE
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Gypsum building product
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Patent number 5,171,366
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Issue date Dec 15, 1992
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Georgia-Pacific Corporation
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Turner W. Richards
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B28 - WORKING CEMENT, CLAY, OR STONE
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Fire door core
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Patent number 4,159,302
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Issue date Jun 26, 1979
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Georgia-Pacific Corporation
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Dale R. Greve
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES