US4076884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibre reinforcing composites
Assignee: University of Toronto
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Filing: 1975-06-11
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Granted: 1978-02-28
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Expires: 1995-06-11
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
2026-11-04 12:09
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/07; C; C04; C04B; C04B20/00; C04B20/0048; C04B20/0052; Y; Y10; Y10T; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/103
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A fibre reinforced gypsum composite comprising gypsum matrix material having embedded therein a woven tape, said woven tape comprising an interweave of absorbent fibres with reinforcing glass fibres, said reinforcing glass fibres being glass yarn coated with a thermoplastic organic polymer, said polymer being selected from the group consisting of polyethylene, polyvinyl chloride, polypropylene, nylon and polystyrene.
Claim 2
Dependent Claim
57 words
A fibre reinforced gypsum composite comprising gypsum matrix material having embedded therein a woven tape, said woven tape comprising an interweave of absorbent fibres with reinforcing glass fibres, said reinforcing glass fibres being glass yarn coated with a thermoplastic organic polymer, said polymer being selected from the group consisting of polyethylene, polyvinyl chloride, polypropylene, nylon and polystyrene.
Claim 3
Dependent Claim
18 words
The fibre reinforced gypsum composite of claim 1 wherein the thermoplastic organic polymer is polyethylene or polyvinyl chloride.
Claim 4
Dependent Claim
16 words
The fibre reinforced gypsum composite of claim 2 wherein the absorbent fibre is cotton or rayon.
Claim 5
Dependent Claim
25 words
The fibre reinforced gypsum composite of claim 3 wherein the tape has fibres spaced at intervals of about 4 to about 30 ends per inch.
Claim 6
Dependent Claim
43 words
The fibre reinforced gypsum composite of claim 3 wherein the coated glass yarn and the absorbent fibre are pre-twisted together into a composite yarn, and the composite yarn is used as the fibres in at least one direction of weave of said tape.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |