Patent US4781994A successfully refreshed from Google Patents.
US4781994A
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Fiber-reinforced cement material and molded article comprising hardened product thereof
Assignee: Kureha Corp
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Filing: 1987-09-21
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Granted: 1988-11-01
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Expires: 2007-09-21
Abstract
Abstract A cement material containing polyarylene thioether fibers and carbon fibers as reinforcing fiber and molded articles comprising hardened products thereof are disclosed. The fiber reinforced cement material is curable in an autoclave and the molded articles comprising the hardened products thereof are excellent in deflection property, impact strength, tensile strength and bending strength.
Inventors
- 👤 Toshio Enoki
- 👤 Yasuo Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
A fiber-reinforced cement material comprising (A) 100 parts by volume of a cement component, (B) 0.5 to 20 parts by volume of polyarylene thioether fibers and (C) 0.5 to 20 parts by volume of carbon fibers.
Claim 2
Dependent Claim
36 words
A fiber-reinforced cement material comprising (A) 100 parts by volume of a cement component, (B) 0.5 to 20 parts by volume of polyarylene thioether fibers and (C) 0.5 to 20 parts by volume of carbon fibers.
Claim 3
Dependent Claim
39 words
The fiber-reinforced cement material according to claim 1, wherein the total amount of said polyarylene thioether fibers and said carbon fibers is not more than 25 parts by volume based on 100 parts by volume of said cement component.
Claim 4
Dependent Claim
27 words
The fiber-reinforced cement material according to claim 1 wherein said polyarylene thioether fibers are those of polymer having the unit ##STR10## as the main constitutional repeating unit.
Claim 5
Dependent Claim
43 words
A molded article comprising hardened product of a fiber-reinforced cement material comprising (A) 100 parts by volume of a cement component, (B) 0.5 to 20 parts by volume of polyarylene thioether fibers and (C) 0.5 to 20 parts by volume of carbon fibers.
Claim 6
Dependent Claim
43 words
A molded article comprising hardened product of a fiber-reinforced cement material comprising (A) 100 parts by volume of a cement component, (B) 0.5 to 20 parts by volume of polyarylene thioether fibers and (C) 0.5 to 20 parts by volume of carbon fibers.
Claim 7
Dependent Claim
38 words
The molded article according to claim 4, wherein the total amount of said polyarylene thioether fibers and said carbon fibers is not more than 25 parts by volume based on 100 parts by volume of said cement component.
Claim 8
Dependent Claim
27 words
The molded article according to claim 4, wherein said polyarylene thioether fibers are those of polymer having the repeating unit ##STR11## as the main constitutional repeating unit.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |