US3964944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cementitious board
Assignee: United States Gypsum Co
•
Filing: 1973-11-06
•
Granted: 1976-06-22
•
Expires: 1993-11-06
Abstract
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.
Inventors
- 👤 Thomas Gwynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B32B13/08; E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; B32B3/00; B32B3/02; B32B3/04; B32B2315/00; B32B2315/18; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/1011; Y10T156/1052; Y10T156/1062; Y10T156/1064; Y10T156/1082; Y10T428/00; Y10T428/23; Y10T428/232; Y10T428/24; Y10T428/24777
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
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.
Claim 2
Independent Claim
134 words
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.
Claim 3
Dependent Claim
47 words
The method of claim 1 wherein said scoring step comprises removal of part of the thickness of said lower sheet along the lines of intended folds and said adhesive is applied along the line of at least one such fold other than the outermost at each edge.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said adhesive is a hot melt adhesive.
References Cited (Backward Citations)
US1750621A
Cited
US1671084A
Cited
US1846881A
Cited
US2213249A
Cited
US3241276A
Cited
US3435582A
Cited
US3563843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |