US4133928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforcing composites comprising portland cement having embedded therein precombined absorbent and reinforcing fibers
Assignee: University of Toronto
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Filing: 1977-08-29
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Granted: 1979-01-09
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Expires: 1997-08-29
Abstract
Abstract Fibre reinforced composites of cementitious materials or gypsum are reinforced with pre-combined mixtures of strong reinforcing fibres e.g., glass or steel, and water absorbent fibres, e.g., cotton. Examples of composites are cement pipes, wall boards, etc.
Inventors
- 👤 Victor Riley
- 👤 Ian Macnab
- 👤 John Timusk
- 👤 Edward English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:00
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; A; A61; A61L; A61L15/00; A61L15/07; A61L15/08; E; E04; E04C; E04C5/00; E04C5/07; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/103; Y10T442/50; Y10T442/51; Y10T442/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
Fibre reinforced composite comprising a portland cementitious matrix material having embedded therein precombined absorbent fibres and reinforcing fibres, said absorbent fibres being selected from the group consisting of cotton, wool, cellulose, viscose rayon and cuprammonium rayon, and the reinforcing fibres being selected from the group consisting of glass, steel, carbon, polyethylene and polypropylene.
Claim 2
Dependent Claim
53 words
Fibre reinforced composite comprising a portland cementitious matrix material having embedded therein precombined absorbent fibres and reinforcing fibres, said absorbent fibres being selected from the group consisting of cotton, wool, cellulose, viscose rayon and cuprammonium rayon, and the reinforcing fibres being selected from the group consisting of glass, steel, carbon, polyethylene and polypropylene.
Claim 3
Dependent Claim
84 words
Composite of claim 1 wherein the fibres are precombined together by a process selected from the group consisting of twisting together said selected reinforcing fibre and said selected absorbent fibre, spinning together said selected absorbent fibre and said selected reinforcing fibre into a multiply yarn, interweaving said selected absorbent fibre and said selected reinforcing fibre into a mesh, interweaving twisted together said selected absorbent fibre and said selected reinforcing fibre into a mesh, and interweaving said multiply yarn prepared as aforesaid into a mesh.
Claim 4
Dependent Claim
33 words
Composite of claim 1 wherein the reinforcing fibre is glass or steel, the absorbent fibre is cotton or rayon, and the reinforcing fibre and the absorbent fibre are present in an interwoven mesh.
Claim 5
Dependent Claim
22 words
Composite of claim 3 wherein the interwoven mesh has fibres spaced at intervals of about 4 to about 30 ends per inch.
Claim 6
Dependent Claim
13 words
Composite of claim 1 wherein the fibres are precombined together as a felt.
Claim 7
Dependent Claim
30 words
Composite according to claim 1 wherein the reinforcing fibre is thermoplastic organic polymer coated glass yarn, and the reinforcing fibre and the absorbent fibre are present in an interwoven mesh.
Claim 8
Dependent Claim
15 words
Composite according to claim 6 wherein the thermoplastic organic polymer coating is polyethylene or polyvinylchloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |