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US 4,195,110 AGranted
Glass-reinforced composite gypsum board
AssigneeUnited States Gypsum Company
InventorsRobert P. Dierks, Robert J. Rillie
Life of this patent
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Abstract
A reinforced gypsum board having glass fibers concentrated in the portions of the rehydrated stucco immediately below the surfaces of the board, these portions being further defined by a density that is substantially greater than that of the interior portion of the board.
Claims18
A reinforced gypsum board having two opposite exposed gypsum face surfaces terminating in edge surfaces, the board consisting essentially of
- rehydrated stucco and randomly disposed glass fibers and being free of organic fibers,
- the fibers being selectively dispersed within the stucco so as to define, under said face surfaces, reinforced stucco portions in which said fibers are uniformly concentrated, and a core stucco portion disposed between said reinforced portions which is essentially free of said fibers,
- said reinforced portions having a density of stucco which is substantially greater than that of the stucco of said core portion,
- whereby said board has enhanced flexural strength.
1 more element
A reinforced composite gypsum board, consisting essentially of
- a core of rehydrated stucco essentially free of glass fibers, said core having two opposite faces,
- and two layers of rehydrated stucco being free of organic fibers and having randomly disposed glass fibers dispersed generally uniformly throughout and having a rehydrated stucco density substantially greater than that of said core, each of the layers being bonded to a respectively opposite face of said stucco core and having outer exposed gypsum surfaces,
- whereby said board has enhanced flexural strength.
Dependencies are inferred from the claim text.