US3940541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a decorative gypsum board
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1973-06-06
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Granted: 1976-02-24
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Expires: 1993-06-06
Abstract
Abstract In the production of decorative gypsum board, wherein a hemihydrate gypsum slurry is continuously injected between decorative gypsum board card paper and conventional gypsum board card paper and the thus slurry-injected sheets are pressed by a suitable means to form the sheets in a predetermined thickness and then dried to form the decorative gypsum board, the improvement comprising coating with an urethane resin solution over decorative low-weight basis paper such as tissue paper or machine glazed white paper, drying the coated paper and laminating the resultant paper to a gypsum board card paper to obtain said decorative gypsum board card paper.
Inventors
- 👤 Shinsaku Kanatsu
- 👤 Akira Takahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:08
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B32B13/08; B44; B44C; B44C5/00; B44C5/04; B44C5/0469; B32B38/00; B32B38/14; B32B38/145; B32B2255/00; B32B2255/12; B32B2255/26; B32B2307/00; B32B2307/70; B32B2307/718; B32B2307/75; B32B2451/00; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
Decorative gypsum board which comprises gypsum sandwiched between sheets of gypsum board card paper, at least one of said sheets comprising a low-weight basis decorative paper coated with 1-5 g/m 2 based upon the solid component of a urethane resin and laminated to gypsum board card paper.
Claim 2
Dependent Claim
47 words
Decorative gypsum board which comprises gypsum sandwiched between sheets of gypsum board card paper, at least one of said sheets comprising a low-weight basis decorative paper coated with 1-5 g/m 2 based upon the solid component of a urethane resin and laminated to gypsum board card paper.
Claim 3
Dependent Claim
27 words
The decorative gypsum board according to claim 1 wherein said low-weight basis paper is selected from the group consisting of tissue paper and machine glazed white paper.
Claim 4
Dependent Claim
88 words
In the production of decorative gypsum board wherein a hemihydrate gypsum slurry is placed between sheets of gypsum board card paper, at least one of which is decorative, and dried to produce said board, the improvement comprising coating low-weight basis decorative paper with a urethane resin in an amount of 1-5 g/m 2 based on the solid component, drying the resin-coated paper, laminating the resultant paper to a gypsum board card paper, and utilizing said laminated paper as the decorative card paper upon which the slurry is placed.
Claim 5
Dependent Claim
88 words
In the production of decorative gypsum board wherein a hemihydrate gypsum slurry is placed between sheets of gypsum board card paper, at least one of which is decorative, and dried to produce said board, the improvement comprising coating low-weight basis decorative paper with a urethane resin in an amount of 1-5 g/m 2 based on the solid component, drying the resin-coated paper, laminating the resultant paper to a gypsum board card paper, and utilizing said laminated paper as the decorative card paper upon which the slurry is placed.
Claim 6
Dependent Claim
23 words
A method according to claim 3, further comprising printing a suitable pattern on the low-weight basis decorative paper prior to the coating step.
Claim 7
Dependent Claim
25 words
A method according to claim 3, wherein said low-weight basis paper is selected from the group consisting of tissue paper and machine glazed white paper.
References Cited (Backward Citations)
CA519920A
Cited
US3616144A
Cited
US3660187A
Cited
US3677874A
Cited
US3694298A
Cited
US3798098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |