US4064317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-resistant plaster board and its manufacture
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1976-02-04
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Granted: 1977-12-20
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Expires: 1996-02-04
Abstract
Abstract A flame-resistant plaster board characterized in that the board paper constituting the outside of the plaster board contains at least one alkali compound selected from the group consisting of hydroxides and salts of alkali metals and alkaline earth metals which easily decompose or melt on heating. Said flame-resistant plaster board is improved in that the generation of smoke on heating is inhibited without reduction of the mechanical strength.
Inventors
- 👤 Kozo Fukuba
- 👤 Minematsu Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; B; B32; B32B; B32B13/00; B32B13/04; B32B13/08; C; C09; C09K; C09K21/00; C09K21/02; D21H17/00; D21H17/63; D21H17/64; D21H5/00; D21H5/0002; D21H27/00; D21H27/30; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
A flame-resistant plaster board, characterized in that the board paper constituting the outside of said plaster board contains a mixture of sodium formate and calcium formate, and a penetrating agent.
Claim 2
Dependent Claim
30 words
A flame-resistant plaster board, characterized in that the board paper constituting the outside of said plaster board contains a mixture of sodium formate and calcium formate, and a penetrating agent.
Claim 3
Dependent Claim
15 words
The board according to claim 1, wherein the board paper further contains a water repellant.
Claim 4
Dependent Claim
27 words
The board according to claim 1, wherein the board paper contains 1 to 30% by weight of the mixture based on the weight of the board paper.
Claim 5
Dependent Claim
18 words
The board according to claim 1, wherein the weight ratio of sodium formate and calcium formate is 1:0.01-2.
Claim 6
Dependent Claim
24 words
The board according to claim 1, wherein the pentrating agent is selected from the group consisting of surfactants, water-soluble lower aliphatic alcohols and ammonia.
Claim 7
Dependent Claim
50 words
The board according to claim 1, wherein the penetrating agent is a surfactant of the formula: ##STR2## wherein R 1 is alkyl or aralkyl, A and B are each hydrogen or R 1 O--(CH 2 CH 2 O) n -- and n is a number of about 1 to 30.
Claim 8
Dependent Claim
28 words
The board according to claim 1, wherein the board paper contains a surfactant as the penetrating agent in an amount of about 50 to 100 g/m 2 .
Claim 9
Independent Claim
77 words
A method for making a plaster board smoke-inhibited on heating, which comprises treating the plaster board molded with an aqueous solution or slurry of a mixture of sodium formate and calcium formate to impregnate the solution or slurry into the board paper constituting the outside of the plaster board, or by molding a plaster board usig as a constituent of the outside a board paper previously treated with an aqueous solution or slurry of the said mixture.
Claim 10
Independent Claim
77 words
A method for making a plaster board smoke-inhibited on heating, which comprises treating the plaster board molded with an aqueous solution or slurry of a mixture of sodium formate and calcium formate to impregnate the solution or slurry into the board paper constituting the outside of the plaster board, or by molding a plaster board usig as a constituent of the outside a board paper previously treated with an aqueous solution or slurry of the said mixture.
References Cited (Backward Citations)
US3973074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |