Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
April 27, 2010
Patent Application Number
11352729
Date Filed
February 13, 2006
Patent Primary Examiner
Patent abstract
A ceiling tile of gypsum and cellulose fibers formed into a board by initially mixing the fibers and gypsum in a water-based slurry that is felted and thereafter pressed and dried with a desired board thickness, the dried board being processed to form a plurality of holes in a face thereof through at least the majority of the thickness of the board, the collective volume of the holes being sufficient to reduce the weight of the board by at least 10% and increase the NRC exhibited by the board over that which would otherwise be found in a board of the same composition without such holes.
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