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Title: US3964944: Manufacture of cementitious board
[ Derwent Title ]

Country: US United States of America

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5 pages

Inventor: Gwynne, Thomas; Loughborough, United Kingdom

Assignee: United States Gypsum Company, Chicago, IL
other patents from UNITED STATES GYPSUM COMPANY (597130) (approx. 367)
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Published / Filed: 1976-06-22 / 1973-11-06

Application Number: US1973000413289

IPC Code: Advanced: E04C 2/04;
Core: more...
IPC-7: B32B 1/04; B32B 31/18;

ECLA Code: E04C2/04C;

U.S. Class: Current: 156/040; 052/631; 156/202; 156/245; 156/257; 156/268; 264/333; 428/070; 428/192; 428/703;
Original: 156/040; 052/631; 156/202; 156/245; 156/257; 156/268; 264/333; 428/070; 428/192;

Field of Search: 156/039,40,216,257,268,202,245 052/631 161/043,44,104 264/333 428/070,192

Priority Number:
1973-11-06  US1973000413289

Abstract:     The invention relates to the manufacture of cementitious board, such as gypsum board, faced with paper or other sheets and having an improved accuracy of edge profile. A sheet to be folded at the lateral edges of the board is scored, and quick-setting adhesive, preferably a hot melt adhesive, is applied along the lines of folding. The sheet is then folded to the desired configuration and held until the adhesive has set thus establishing an accurate profile that withstands the action of the aqueous slurry of cementitious material and the application of the other sheet. The invention can be applied to various profiles, including square edge, tapered edge, rebated and tongue-and-groove.

Attorney, Agent or Firm: Kurlandsky, Samuel ; Rudd, Donnie ; Roberts, Kenneth E. ;

Primary / Asst. Examiners: Van Balen, William J.; Epstein, Henry F.

Family: None

First Claim:
Show all 3 claims
I claim:     1. A method for the manufacture of a planar lined board of cementitious material including the steps of:
  • scoring a lower lining sheet at its edge regions along lines where folds are to be made;
  • advancing said lower sheet in a generally horizontal plane;
  • applying substantially solely to said edge regions of said lower sheet in the parts thereof to be folded at least one line or band of quick-setting adhesive;
  • folding the edges of said advancing sheet to provide at least part of the final edge configuration of the board and maintaining said regions in said configuration until fixed therein by setting of said adhesive;
  • depositing an aqueous slurry of cementitious material on said advancing sheet;
  • covering said slurry with an advancing upper lining sheet;
  • and forming the resulting board to required cross-sectional dimensions.

Background / Summary: Show background / summary

Drawing Descriptions: Show drawing descriptions

Description: Show description

Forward References: Show 13 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (13)   |   Backward references (7)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 3pp US1671084  1928-05 Meyercord   Joint filler in angle of plymetl wall
Get PDF - 5pp US1750621* 1930-03 Brookby    
Get PDF - 3pp US1846881* 1932-02 Lewis    
Get PDF - 6pp US2213249* 1940-09 Kelley    
Get PDF - 3pp US3241276* 1966-03 Vance et al.    
Get PDF - 6pp US3435582  1969-04 Disney et al.   WALLBOARD CONSTRUCTION
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Foreign References: None

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