US4314003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of incorporating multifilament strands of carbon fibers into cement to produce reinforced structures having improved flexural strengths
Assignee: BP Corp North America Inc
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Filing: 1980-04-25
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Granted: 1982-02-02
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Expires: 2000-04-25
Abstract
Abstract Method of incorporating multifilament strands of carbon fibers into an aqueous hardenable hydraulic cementitious matrix which can be set to produce a reinforced structure having improved flexural strength which comprises treating the fiber strands with a hydrophobic resin system prior to adding them to the cementitious matrix.
Inventors
- 👤 Richard D. Curnow
- 👤 Christopher G. Cowie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:52
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/12; B; B28; B28B; B28B1/00; B28B1/52; B28B23/00; B28B23/0006; B28B23/02; B28B23/022; C; C04; C04B; C04B14/00; C04B14/38; C04B14/386; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1037; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/249932; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/31504; Y10T428/31511; Y10T428/31515
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A reinforced cementitious structure having improved flexural strength comprising a cementitious matrix containing discrete cement particles reinforced with multifilament strands of carbon fibers characterized in that said carbon fibers are bonded to each other and to said cement particles surrounding said carbon fibers by a hydrophobic resin system which has been incorporated into said carbon fibers by impregnation and which has been cured simultaneously with said cementitious matrix.
Claim 2
Dependent Claim
68 words
A reinforced cementitious structure having improved flexural strength comprising a cementitious matrix containing discrete cement particles reinforced with multifilament strands of carbon fibers characterized in that said carbon fibers are bonded to each other and to said cement particles surrounding said carbon fibers by a hydrophobic resin system which has been incorporated into said carbon fibers by impregnation and which has been cured simultaneously with said cementitious matrix.
Claim 3
Dependent Claim
29 words
A reinforced cementitious structure as in claim 1 wherein the hydrophobic resin system is an epoxy resin system comprised of an epoxy resin and a reactive epoxy resin hardener.
Claim 4
Dependent Claim
18 words
A reinforced cementitious structure as in claim 2 wherein the epoxy resin hardener is a hydrophobic fatty amine.
Claim 5
Dependent Claim
22 words
A reinforced cementitious structure as in claim 3 wherein the hydrophobic fatty amine has an amine number of from 170 to 180.
Claim 6
Dependent Claim
19 words
A reinforced cementitious structure as in claim 1 wherein the strands of carbon fibers are arranged in parallel rows.
Claim 7
Dependent Claim
29 words
A reinforced cementitious structure as in claim 5 wherein the hydrophobic resin system is an epoxy resin system comprised of an epoxy resin and a reactive epoxy resin hardener.
Claim 8
Dependent Claim
18 words
A reinforced cementitious structure as in claim 6 wherein the epoxy resin hardener is a hydrophobic fatty amine.
Claim 9
Dependent Claim
22 words
A reinforced cementitious structure as in claim 7 wherein the hydrophobic fatty amine has an amine number of from 170 to 180.
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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) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |