Bruce A Wittrup from 850 Wellington Ave, Elk Grove Vlg, IL 60007, Phone: 8476400723

Bruce Wittrup Phones & Addresses

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Paper-Backed Acoustical Tile
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US Patent:

40162346, Apr 5, 1977
Filed:

Jun 20, 1975
Appl. No.:

5/588924
Inventors:

Herbert L. Warren - Arlington Heights IL
Bruce A. Wittrup - Hoffman Estates IL
Assignee:

United States Gypsum Company - Chicago IL
International Classification:

E04B 174
US Classification:

264129
Abstract:

An acoustical tile comprising a relatively thin, flat body of acoustical composition including fibrous material and a binder, and a paper backing affixed thereto having a fire-retardant material dispersed therein, the outer facing surface of the tile being either planar or slightly convex.

Paper-Backed Acoustical Tile
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US Patent:

40108171, Mar 8, 1977
Filed:

May 20, 1974
Appl. No.:

5/471392
Inventors:

Herbert L. Warren - Arlington Heights IL
Bruce A. Wittrup - Hoffman Estates IL
Assignee:

United States Gypsum Company - Chicago IL
International Classification:

E04B 199
US Classification:

181 33G
Abstract:

An acoustical tile comprising a relatively thin, flat body of acoustical composition including fibrous material and a binder, and a paper backing affixed thereto having a fire-retardant material dispersed therein, the outer facing surface of the tile being either planar or slightly convex.