US4428775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced cement sheet product containing no asbestos for fabricating on hatschek machine
Assignee: NATIONA GYPSUM Co
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Filing: 1981-02-11
•
Granted: 1984-01-31
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Expires: 2001-02-11
Abstract
Abstract A fiber-cement product which is capable of being formed on a Hatschek machine consisting essentially of a Portland cement binder in the amount of between about 40% and 80% by weight, natural and/or synthetic fibers in an amount of between about 1% and 15% by weight, clay in an amount of between about 2% and 15% by weight, and poly(ethylene oxide) homopolymer in an amount of between about 0.03% and 0.5% by weight. The product may also contain silica and/or filler in an amount of between 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 14:16
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52; B28B1/527; C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 70
Claim 1
Independent Claim
74 words
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers in an amount of between about 1% and 15% by weight, clay in an amount of between about 2% and 15% by weight, and poly(ethylene oxide) in a sufficient amount to coact with said clay in an aqueous slurry containing said Portland cement, fibers and clay to retain fines in a mat formed from said slurry.
Claim 2
Dependent Claim
74 words
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers in an amount of between about 1% and 15% by weight, clay in an amount of between about 2% and 15% by weight, and poly(ethylene oxide) in a sufficient amount to coact with said clay in an aqueous slurry containing said Portland cement, fibers and clay to retain fines in a mat formed from said slurry.
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
23 words
A fiber-cement product as set forth in claim 1 wherein said poly(ethylene oxide) has a molecular weight of between about 900,000 and 5,000,000.
Claim 7
Dependent Claim
26 words
A fiber-cement product as set forth in claim 1 wherein said poly(ethylene oxide) is present in an amount of between about 0.03% and 0.5% by weight.
Claim 8
Dependent Claim
16 words
A fiber-cement product as set forth in claim 6 wherein said fibers are acetalized polyvinyl alcohol.
Claim 9
Dependent Claim
26 words
A fiber-cement product as set forth in claim 1 wherein said poly(ethylene oxide) is present in an amount of between about 0.04% and 0.3% by weight.
Claim 10
Dependent Claim
16 words
A fiber-cement product as set forth in claim 8 wherein said fibers are acetalized polyvinyl alcohol.
Claim 11
Dependent Claim
26 words
A fiber-cement product as set forth in claim 1 wherein said poly(ethylene oxide) is present in an amount of between about 0.05% and 0.1% by weight.
Claim 12
Dependent Claim
16 words
A fiber-cement product as set forth in claim 10 wherein said fibers are acetalized polyvinyl alcohol.
Claim 13
Dependent Claim
32 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, and aramid.
Claim 14
Dependent Claim
16 words
A fiber-cement product as set forth in claim 1 wherein said fibers are cotton and polypropylene.
Claim 15
Dependent Claim
41 words
A fiber-cement product as set forth in claim 13 wherein said cotton is present in an amount of between about 2% and 10% by weight and the polypropylene is present in an amount of between about 0.3% and 2% by weight.
Claim 16
Dependent Claim
41 words
A fiber-cement product as set forth in claim 13 wherein said cotton is present in an amount of between about 5% and 7% by weight and said polypropylene is present in an amount of between about 0.5% and 1% by weight.
Claim 17
Dependent Claim
78 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 poly(ethylene oxide) is present in an amount of between about 0.05% and 0.1% by weight.
Claim 18
Dependent Claim
16 words
A fiber-cement product as set forth in claim 16 wherein said fibers comprise cotton amd polypropylene.
Claim 19
Dependent Claim
16 words
A fiber-cement product as set forth in claim 16 wherein said fibers are acetalized polyvinyl alcohol.
Claim 20
Dependent Claim
26 words
A fiber-cement product as set forth in claim 18 wherein said acetalized polyvinyl alcohol fibers are present in an amount of between about 2% and 5%.
Claim 21
Dependent Claim
22 words
A fiber-cement product as set forth in claim 16 including silica in an amount of between about 20% and 35% by weight.
Claim 22
Dependent Claim
23 words
A fiber-cement product as set forth in claim 20 wherein said poly(ethylene oxide) has a molecular weight of between about 90,000 and 5,000,000.
Claim 23
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 24
Dependent Claim
26 words
A fiber-cement product as set forth in claim 22 wherein said poly(ethylene oxide) is present in an amount of between about 0.03% and 0.5% by weight.
Claim 25
Dependent Claim
26 words
A fiber-cement product as set forth in claim 22 wherein said poly(ethylene oxide) is present in an amount of between about 0.04% and 0.3% by weight.
Claim 26
Dependent Claim
26 words
A fiber-cement product as set forth in claim 22 wherein said poly(ethylene oxide) is present in an amount of between about 0.05% and 0.1% by weight.
Claim 27
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 28
Dependent Claim
26 words
A fiber-cement product as set forth in claim 26 wherein said poly(ethylene oxide) is present in an amount of between about 0.03% and 0.5% by weight.
Claim 29
Dependent Claim
26 words
A fiber-cement product as set forth in claim 26 wherein said poly(ethylene oxide) is present in an amount of between about 0.04% and 0.3% by weight.
Claim 30
Dependent Claim
26 words
A fiber-cement product as set forth in claim 26 wherein said poly(ethylene oxide) is present in an amount of between about 0.05% and 0.1% by weight.
Claim 31
Dependent Claim
22 words
A fiber-cement product as set forth in claim 1 including wollastonite in an amount of between about 10% and 40% by weight.
Claim 32
Dependent Claim
17 words
A fiber-cement product as set forth in claim 30 wherein said fibers comprise acetalized polyvinyl alcohol fibers.
Claim 33
Dependent Claim
22 words
A fiber-cement product as set forth in claim 1 including wollastonite in an amount of between about 15% and 35% by weight.
Claim 34
Dependent Claim
17 words
A fiber-cement product as set forth in claim 32 wherein said fibers comprise acetalized polyvinyl alcohol fibers.
Claim 35
Dependent Claim
27 words
A fiber-cement product as set forth in claim 33 wherein said acetalized polyvinyl fibers are present in an amount of between about 2% and 10% by weight.
Claim 36
Dependent Claim
26 words
A fiber-cement product as set forth in claim 32 wherein said poly(ethylene oxide) is present in an amount of between about 0.03% and 0.5% by weight.
Claim 37
Dependent Claim
25 words
A fiber-cement product as set forth in claim 35 wherein said clay is present in an amount of between about 3% and 10% by weight.
Claim 38
Dependent Claim
25 words
A fiber-cement product as set forth in claim 35 wherein said clay is present in an amount of between about 4% and 7% by weight.
Claim 39
Dependent Claim
26 words
A fiber-cement product as set forth in claim 32 wherein said poly(ethylene oxide) is present in an amount of between about 0.04% and 0.3% by weight.
Claim 40
Dependent Claim
25 words
A fiber-cement product as set forth in claim 38 wherein said clay is present in an amount of between about 3% and 10% by weight.
Claim 41
Dependent Claim
25 words
A fiber-cement product as set forth in claim 38 wherein said clay is present in an amount of between about 4% and 7% by weight.
Claim 42
Dependent Claim
26 words
A fiber-cement product as set forth in claim 32 wherein said poly(ethylene oxide) is present in an amount of between about 0.05% and 0.1% by weight.
Claim 43
Dependent Claim
25 words
A fiber-cement product as set forth in claim 41 wherein said clay is present in an amount of between about 3% and 10% by weight.
Claim 44
Dependent Claim
25 words
A fiber-cement product as set forth in claim 41 wherein said clay is present in an amount of between about 4% and 7% by weight.
Claim 45
Dependent Claim
25 words
A fiber-cement product as set forth in claim 1 wherein said poly(ethylene oxide) is present in an amount of at least about 0.03% by weight.
Claim 46
Dependent Claim
17 words
A fiber-cement product as set forth in claim 1 wherein said clay is of the Attapulgus type.
Claim 47
Dependent Claim
17 words
A fiber-cement product as set forth in claim 1 wherein said fibers comprise acetalized polyvinyl alcohol fibers.
Claim 48
Dependent Claim
28 words
A fiber-cement product as set forth in claim 46 wherein said acetalized polyvinyl alcohol fibers are present in an amount of between about 2% and 10% by weight.
Claim 49
Dependent Claim
28 words
A fiber-cement product as set forth in claim 46 wherein said acetalized polyvinyl alcohol fibers are present in an amount of between about 2% and 5% by weight.
Claim 50
Dependent Claim
74 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 poly(ethylene oxide) in relatively sufficient amounts to maintain said fibers in suspension in an aqueous slurry containing said fibers and Portland cement and to retain a larger amount of fines in a mat formed from said slurry than can be retained by the use of said poly(ethylene oxide) by itself.
Claim 51
Dependent Claim
74 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 poly(ethylene oxide) in relatively sufficient amounts to maintain said fibers in suspension in an aqueous slurry containing said fibers and Portland cement and to retain a larger amount of fines in a mat formed from said slurry than can be retained by the use of said poly(ethylene oxide) by itself.
Claim 52
Dependent Claim
23 words
A fiber-cement product as set forth in claim 49 wherein said clay is present in an amount of at least 2% by weight.
Claim 53
Dependent Claim
17 words
A fiber-cement product as set forth in claim 50 wherein said clay is of the Attapulgus type.
Claim 54
Dependent Claim
24 words
A fiber-cement product as set forth in claim 50 wherein said poly(ethylene oxide) is present in an amount of at least 0.03% by weight.
Claim 55
Dependent Claim
24 words
A fiber-cement product as set forth in claim 49 wherein said poly(ethylene oxide) is present in an amount of at least 0.03% by weight.
Claim 56
Dependent Claim
17 words
A fiber-cement product as set forth in claim 50 wherein said fibers comprise acetalized polyvinyl alcohol fibers.
Claim 57
Dependent Claim
26 words
A fiber-cement product as set forth in claim 54 wherein said acetalized polyvinyl alcohol fibers are present in an amount of at least 1% by weight.
Claim 58
Dependent Claim
24 words
A fiber-cement product as set forth in claim 55 wherein said poly(ethylene oxide) is present in an amount of at least 0.03% by weight.
Claim 59
Dependent Claim
29 words
A fiber-cement product as set forth in claim 55 including wollastonite in a sufficient amount to reduce wet-to-dry dimensional changes relative to similar compositions which do not contain wollastonite.
Claim 60
Dependent Claim
24 words
A fiber-cement product as set forth in claim 57 wherein said wollastonite is present in an amount of at least about 10% by weight.
Claim 61
Dependent Claim
14 words
A fiber-cement product as set forth in claim 49 wherein said fibers comprise cotton.
Claim 62
Dependent Claim
16 words
A fiber-cement product as set forth in claim 49 wherein said fibers comprise cotton and polypropylene.
Claim 63
Dependent Claim
29 words
A fiber-cement product as set forth in claim 49 including wollastonite in a sufficient amount to reduce wet-to-dry dimensional changes relative to similar compositions which do not contain wollastonite.
Claim 64
Dependent Claim
97 words
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers other than asbestos in an amount of at least about 1% by weight, poly(ethylene oxide), and clay in an amount of at least about 2% by weight to coact with said poly(ethylene oxide) in an aqueous slurry containing said Portland cement, fibers and poly(ethylene oxide) 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 poly(ethylene oxide) by itself.
Claim 65
Dependent Claim
97 words
A fiber-cement product comprising Portland cement in an amount of between about 40% and 80% by weight, fibers other than asbestos in an amount of at least about 1% by weight, poly(ethylene oxide), and clay in an amount of at least about 2% by weight to coact with said poly(ethylene oxide) in an aqueous slurry containing said Portland cement, fibers and poly(ethylene oxide) 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 poly(ethylene oxide) by itself.
Claim 66
Dependent Claim
25 words
A fiber-cement product as set forth in claim 62 wherein said poly(ethylene oxide) is present in an amount of at least about 0.03% by weight.
Claim 67
Dependent Claim
14 words
A fiber-cement product as set forth in claim 62 wherein said fibers comprise cotton.
Claim 68
Dependent Claim
16 words
A fiber-cement product as set forth in claim 62 wherein said fibers comprise cotton and polypropylene.
Claim 69
Dependent Claim
17 words
A fiber-cement product as set forth in claim 62 wherein said fibers comprise acetalized polyvinyl alcohol fibers.
Claim 70
Dependent Claim
11 words
A fiber-cement product as set forth in claim 66 including wollastonite.
References Cited (Backward Citations)
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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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |