US4363666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced cement sheet product containing fibers other than asbestos, clay and thickener
Assignee: National Gypsum Properties LLC
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Filing: 1981-02-11
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Granted: 1982-12-14
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Expires: 2001-02-11
Abstract
Abstract A fiber cement product consisting essentially by weight of a Portland cement binder in the amount of between about 40% and 80%, natural and/or synthetic fibers in an amount of between 1% and 15%, clay in an amount of between about 2% and 15%, and thickener in an amount of between about 0.03% and 0.5%. The product may also contain silica and/or filler in an amount of between about 10% and 40% by weight. The silica is generally used in a product which is to be autoclaved. The filler may be waste fiber-cement product or inert filler material.
Inventors
- 👤 Robert M. Johnson
- 👤 Elmer M. Melling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:57
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
91 words
A fiber-cement product comprising by weight Portland cement in an amount of between about 40% and 80%, fibers other than asbestos in an amount of between about 1% and 15%, a thickener, and clay in an amount of between about 2% and 15% to coact with said thickener in an aqueous slurry containing said Portland cement and fibers to provide a sufficiently high drainage time for proper formation of a mat on a screen and a smaller solids loss than can be obtained by the use of said thickener by itself.
Claim 2
Dependent Claim
91 words
A fiber-cement product comprising by weight Portland cement in an amount of between about 40% and 80%, fibers other than asbestos in an amount of between about 1% and 15%, a thickener, and clay in an amount of between about 2% and 15% to coact with said thickener in an aqueous slurry containing said Portland cement and fibers to provide a sufficiently high drainage time for proper formation of a mat on a screen and a smaller solids loss than can be obtained by the use of said thickener by itself.
Claim 3
Dependent Claim
22 words
A fiber-cement product as set forth in claim 1 including silica in an amount of between about 10% and 40% by weight.
Claim 4
Dependent Claim
22 words
A fiber-cement product as set forth in claim 1 including filler in an amount of between about 10% and 40% by weight.
Claim 5
Dependent Claim
27 words
A fiber-cement product as set forth in claim 1 including a combination of silica and filler in an amount of between about 10% and 40% by weight.
Claim 6
Dependent Claim
25 words
A fiber-cement product as set forth in claim 1 wherein said thickener is present in an amount of between about 0.03% and 0.5% by weight.
Claim 7
Dependent Claim
25 words
A fiber-cement product as set forth in claim 1 wherein said thickener is present in an amount of between about 0.04% and 0.3% by weight.
Claim 8
Dependent Claim
25 words
A fiber-cement product as set forth in claim 1 wherein said thickener is present in an amount of between about 0.05% and 0.1% by weight.
Claim 9
Dependent Claim
25 words
A fiber-cement product as set forth in claim 1 wherein said clay is present in an amount of between about 3% and 10% by weight.
Claim 10
Dependent Claim
25 words
A fiber-cement product as set forth in claim 8 wherein said thickener is present in an amount of between about 0.03% and 0.5% by weight.
Claim 11
Dependent Claim
25 words
A fiber-cement product as set forth in claim 8 wherein said thickener is present in an amount of between about 0.04% and 0.3% by weight.
Claim 12
Dependent Claim
25 words
A fiber-cement product as set forth in claim 8 wherein said thickener is present in an amount of between about 0.05% and 0.1% by weight.
Claim 13
Dependent Claim
25 words
A fiber-cement product as set forth in claim 1 wherein said clay is present in an amount of between about 4% and 7% by weight.
Claim 14
Dependent Claim
25 words
A fiber-cement product as set forth in claim 12 wherein said thickener is present in an amount of between about 0.03% and 0.5% by weight.
Claim 15
Dependent Claim
25 words
A fiber-cement product as set forth in claim 12 wherein said thickener is present in an amount of between about 0.04% and 0.3% by weight.
Claim 16
Dependent Claim
25 words
A fiber-cement product as set forth in claim 12 wherein said thickener is present in an amount of between about 0.05% and 0.1% by weight.
Claim 17
Dependent Claim
33 words
A fiber-cement product as set forth in claim 1 wherein said fibers are selected from the group of cotton, sisal, rami, jute, hemp, Kraft, glass, alumina, carbon, mineral fiber, polypropylene, aramid and cotton.
Claim 18
Dependent Claim
77 words
A fiber-cement product as set forth in claim 1 wherein said Portland cement is present in an amount of between about 55% and 65% by weight, and wherein said fibers are present in an amount of between about 5% and 7% by weight, and wherein said clay is present in an amount of between about 4% and 7% by weight, and wherein said thickener is present in an amount of between about 0.05% and 0.1% by weight.
Claim 19
Dependent Claim
73 words
A fiber-cement product comprising by weight Portland cement in an amount of between about 40% and 80%, fibers in an amount of between about 1% and 15%, a thickener, and clay in an amount of between about 2% and 15% to coact with said thickener in an aqueous slurry containing said Portland cement and fibers to provide a lesser solids loss than can be obtained by the use of said thickener by itself.
Claim 20
Dependent Claim
73 words
A fiber-cement product comprising by weight Portland cement in an amount of between about 40% and 80%, fibers in an amount of between about 1% and 15%, a thickener, and clay in an amount of between about 2% and 15% to coact with said thickener in an aqueous slurry containing said Portland cement and fibers to provide a lesser solids loss than can be obtained by the use of said thickener by itself.
Claim 21
Dependent Claim
24 words
A fiber-cement product as set forth in claim 1 wherein said thickener is present in an amount of at least about 0.03% by weight.
Claim 22
Dependent Claim
17 words
A fiber-cement product as set forth in claim 1 wherein said clay is of the Attapulgus type.
Claim 23
Dependent Claim
64 words
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers other than asbestos, and clay and thickener in relatively sufficient amounts to maintain said fibers in suspension in an aqueous slurry containing said fibers and Portland cement and to provide a lesser solids loss than can be obtained by the use of said thickener by itself.
Claim 24
Dependent Claim
64 words
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers other than asbestos, and clay and thickener in relatively sufficient amounts to maintain said fibers in suspension in an aqueous slurry containing said fibers and Portland cement and to provide a lesser solids loss than can be obtained by the use of said thickener by itself.
Claim 25
Dependent Claim
23 words
A fiber-cement product as set forth in claim 21 wherein said clay is present in an amount of at least 2% by weight.
Claim 26
Dependent Claim
17 words
A fiber-cement product as set forth in claim 22 wherein said clay is of the Attapulgus type.
Claim 27
Dependent Claim
23 words
A fiber-cement product as set forth in claim 22 wherein said thickener is present in an amount of at least 0.03% by weight.
Claim 28
Dependent Claim
23 words
A fiber-cement product as set forth in claim 21 wherein said thickener is present in an amount of at least 0.03% by weight.
Claim 29
Dependent Claim
33 words
A fiber-cement product as set forth in claim 21 wherein said fibers are selected from the group of cotton, sisal, rami, jute, hemp, Kraft, glass, alumina, carbon, mineral fiber, polypropylene, aramid and cotton.
Claim 30
Dependent Claim
23 words
A fiber-cement product as set forth in claim 21 wherein said fibers are present in an amount of at least 1% by weight.
Claim 31
Dependent Claim
39 words
A fiber-cement product as set forth in claim 27 wherein said clay is present in an amount of at least 2% by weight and wherein said thickener is present in an amount of at least about 0.03% by weight.
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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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |