US3947285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accelerator
Assignee: BPB Ltd
•
Filing: 1973-08-20
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Granted: 1976-03-30
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Expires: 1993-08-20
Abstract
Abstract The invention relates to an improved accelerator for gypsum board manufacture, the accelerator containing a ground mixture of gypsum and a long chain fatty carboxylic acid, e.g. stearic acid, or a salt thereof, to the manufacture of the accelerator, and to its use in gypsum board production. The accelerator is less liable to deterioration on storage than conventional gypsum accelerators, and its use yields gypsum board of improved properties.
Inventors
- 👤 Kenneth Wood Jones
- 👤 David John Hazeldine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:59
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2103/00; C04B2103/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A set accelerating agent for use in gypsum plaster comprising finely particulate intimate admixture of gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or salt thereof containing from 12 to 22 carbon atoms.
Claim 2
Dependent Claim
46 words
A set accelerating agent for use in gypsum plaster comprising finely particulate intimate admixture of gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or salt thereof containing from 12 to 22 carbon atoms.
Claim 3
Dependent Claim
27 words
An accelerator according to claim 1 wherein the acid or salt is selected from the group consisting of stearic, palmitic, oleic and linoleic acids and their salts.
Claim 4
Dependent Claim
21 words
An accelerator according to claim 1 wherein the accelerator has a specific surface area of at least 800 m 2 /kg.
Claim 5
Dependent Claim
19 words
An accelerator according to claim 1 wherein the acid or salt comprises about 2% by weight of the admixture.
Claim 6
Dependent Claim
30 words
An accelerator according to claim 1 wherein the salt is selected from the group consisting of alkali metal, alkaline earth metal, ammonium, zinc and aluminum salts of the carboxylic acid.
Claim 7
Dependent Claim
14 words
An accelerator according to claim 1 wherein the carboxylic acid salt is a stearate.
Claim 8
Independent Claim
57 words
A method of manufacturing an accelerator, for use in the manufacture of gypsum board from gypsum plaster, which comprises grinding gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or a salt thereof containing from 12 to 22 carbon atoms together to a fine powder.
Claim 9
Independent Claim
57 words
A method of manufacturing an accelerator, for use in the manufacture of gypsum board from gypsum plaster, which comprises grinding gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or a salt thereof containing from 12 to 22 carbon atoms together to a fine powder.
Claim 10
Dependent Claim
62 words
In a process for manufacturing a gypsum board from a plaster slurry, the improvement which comprises incorporating in the plaster slurry an accelerator comprising a finely particulate intimate admixture of gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or a salt thereof containing from 12 to 22 carbon atoms.
Claim 11
Dependent Claim
62 words
In a process for manufacturing a gypsum board from a plaster slurry, the improvement which comprises incorporating in the plaster slurry an accelerator comprising a finely particulate intimate admixture of gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or a salt thereof containing from 12 to 22 carbon atoms.
Claim 12
Dependent Claim
64 words
A gypsum board core made by the process of forming a finely particulate intimate admixture of gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or a salt thereof containing from 12 to 22 carbon atoms; incorporating the admixture in a plaster slurry; and setting the plaster slurry to the gypsum core.
Claim 13
Dependent Claim
64 words
A gypsum board core made by the process of forming a finely particulate intimate admixture of gypsum and up to 10% by weight, based on the weight of the gypsum, of a long chain fatty carboxylic acid or a salt thereof containing from 12 to 22 carbon atoms; incorporating the admixture in a plaster slurry; and setting the plaster slurry to the gypsum core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |