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US4040851A
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Cotton-cement articles
Assignee: GAF Building Materials Corp
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Filing: 1975-05-30
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Granted: 1977-08-09
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Expires: 1995-05-30
Abstract
Abstract A cotton reinforced, cementitious, hydrated product is made by combining on a dry basis between about 25 and about 75 wt. % Portland cement, between about 1 and about 15 wt. % cotton fiber, between about 3 and about 30 wt. % inorganic filler and preferably between about 10 and about 40 wt. % silica with water to form an aqueous slurry. The slurry is formed into desired shapes such as sheets or slabs and cured by autoclaving to produce the desired product.
Inventors
- 👤 B. Randall Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:57
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
61 words
A fiber reinforced cementitious hydrated reaction product of curing a reaction mixture comprising on a dry basis: a. between about 25 and about 75 wt. % Portland cement; b. between about 1 and about 15 wt. % cotton fiber; c. between about 3 and about 30 wt. % inorganic filler; and d. at least sufficient water to supply water of hydration.
Claim 2
Dependent Claim
61 words
A fiber reinforced cementitious hydrated reaction product of curing a reaction mixture comprising on a dry basis: a. between about 25 and about 75 wt. % Portland cement; b. between about 1 and about 15 wt. % cotton fiber; c. between about 3 and about 30 wt. % inorganic filler; and d. at least sufficient water to supply water of hydration.
Claim 3
Dependent Claim
31 words
The reaction product of claim 1 in which the mixture is cured by autoclaving and in which the mixture includes on a dry basis at least about 10 wt. % silica.
Claim 4
Dependent Claim
33 words
The reaction product of claim 2 in which the mixture includes silica in amounts between about 10 and about 40 wt. % on a dry basis and the filler comprises perlite or limestone.
Claim 5
Dependent Claim
39 words
The reaction product of claim 3 in which the filler comprises perlite particles averaging less than about 1.5 mm in size and having a density between about 90 and about 200 kg/m 3 and the silica is diatomaceous silica.
Claim 6
Dependent Claim
25 words
The reaction mixture of claim 4 in which at least a majority of the cotton fibers have lengths between about 1 and about 25 mm.
Claim 7
Dependent Claim
24 words
The reaction mixture of claim 5 which also includes between about 0.1 and about 1.0 wt. % on a dry basis of hydroxyethyl cellulose.
Claim 8
Dependent Claim
16 words
A laminated sheet reaction product according to claim 2 between 2 and about 15 mm thick.
Claim 9
Dependent Claim
7 words
A monolithic reaction product of claim 2.
Claim 10
Dependent Claim
24 words
The reaction product of claim 2 in which at least a majority of the cotton fibers lengths between about 1 and about 25 mm.
Claim 11
Dependent Claim
13 words
The reaction product of claim 2 in which the silica is diatomaceous silica.
Claim 12
Dependent Claim
20 words
A reaction product according to claim 5 and having a density between about 800 and about 1000 kg/m 3 .
Claim 13
Dependent Claim
64 words
A process for making cotton reinforced cementitious material which comprises: a. combining water with, on a dry basis, between about 25 and about 75 wt. % Portland cement, between about 1 and about 15 wt. % cotton fiber and between about 3 and about 30 wt. % inorganic filler to form a reaction mixture; and b. forming and curing said material from said mixture.
Claim 14
Dependent Claim
64 words
A process for making cotton reinforced cementitious material which comprises: a. combining water with, on a dry basis, between about 25 and about 75 wt. % Portland cement, between about 1 and about 15 wt. % cotton fiber and between about 3 and about 30 wt. % inorganic filler to form a reaction mixture; and b. forming and curing said material from said mixture.
Claim 15
Dependent Claim
33 words
The process of claim 12 in which the cement, cotton and filler are combined with sufficient water to form an aqueous slurry and excess water is then removed to form the reaction mixture.
Claim 16
Dependent Claim
20 words
The process of claim 13 in which the aqueous slurry contains between about 80 and about 90 wt. % water.
Claim 17
Dependent Claim
20 words
The process of claim 12 in which the reaction mixture contains between about 10 and about 40 wt. % water.
Claim 18
Dependent Claim
33 words
The process of claim 15 in which the reaction mixture also contains, on a dry basis, at least about 10 wt. % silica and in which curing of said material is by autoclaving.
Claim 19
Dependent Claim
23 words
The process of claim 16 in which the slurry contains between about 10 and about 40 wt. % silica on a dry basis.
Claim 20
Dependent Claim
23 words
The process of claim 17 in which the reaction mixture is formed into laminated sheets between about 2 and about 15 mm thick.
Claim 21
Dependent Claim
37 words
The process of claim 17 in which the filler comprises perlite particles of less than about 1.5 mm size and having a density between about 90 and about 200 kg/m 3 and the silica is diatomaceous silica.
Claim 22
Dependent Claim
25 words
The process of claim 19 in which at least the majority of the cotton fibers are between about 1 and about 25 mm in length.
Claim 23
Dependent Claim
23 words
Product produced according to the process of claim 20 and having a density of between about 800 and about 1000 kg/m 3 .
Claim 24
Dependent Claim
22 words
A product according to claim 21 which includes between about 10 and about 15 wt. % recycled scrap material of similar composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |