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US 3,944,698 AGranted
Gypsum wallboard and process for making same
AssigneeUnited States Gypsum Company
InventorsRobert P. Dierks, Robert J. Rillie
Life of this patent
Estimating the term…
Abstract
A specially prepared fiber reinforcement and improved gypsum wallboard are disclosed. The fiber reinforcement includes a multiplicity of relatively long fibers which are disposed at the interface of the core and cover sheets of the wallboard and are adhesively bonded to the cover sheets and incorporated predominantly into the portion of the core immediately adjacent to the cover sheets.
Claims14
In a gypsum board having a set gypsum core securely bonded to paper cover sheets;
- the improvement comprising a plurality of glass reinforcing fibers in the gypsum core wherein a majority of said fibers are disposed immediately adjacent the interface of the core and at least one of the cover sheets, said fibers being of an average length sufficiently great so that they are frictionally gripped by the core with such force that said fibers will break off rather than pull out of the core when said fibers are subjected to external tension, and being bonded to the cover sheet.
Dependencies are inferred from the claim text.