Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
2005-08-30
2008-08-19
Wood, Elizabeth D (Department: 1793)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
C106S780000, C156S039000, C156S041000, C264S122000, C264S101000, C264S319000, C264S331110, C264S333000, C428S294700, C428S295100, C428S446000, C428S447000, C428S703000
Reexamination Certificate
active
07413603
ABSTRACT:
Articles, including fiberboard, are made from a pumpable, flowable slurry including alpha-calcined calcium sulfate hemihydrate anchored in pores of host particles, alpha-calcined calcium sulfate hemihydrate, a silicone compound, magnesium oxide, and water. The magnesium oxide catalyzes the reaction of the silicone compound into a silicone resin. In a preferred method of making a water resistant fiberboard calcium sulfate dihydrate is combined with the host particles and water to form a slurry which is heated under pressure to calcine the calcium sulfate dihydrate to form alpha-calcined calcium sulfate hemihydrate. After relieving the pressure, a silicone compound and magnesium oxide are added to the slurry. The slurry is dewatered to form a filter cake, which is then formed into a desired shape and allowed to set.
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Miller David Paul
Veeramasuneni Srinivas
Greer Burns & Crain Ltd.
Janci, Esq. David F.
Sahu, Esq. Pradip
United States Gypsum Company
Wood Elizabeth D
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