US3903879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibre reinforcing composites
Assignee: University of Toronto
•
Filing: 1973-03-22
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Granted: 1975-09-09
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Expires: 1993-03-22
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 04:03
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; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3049; Y10T442/3179; Y10T442/322; Y10T442/3228; Y10T442/3236; Y10T442/3244; Y10T442/3252
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
50 words
A MEDICAL PLASTER CAST COMPRISING GYPSUM REINFORCED WITH A WOVEN BANDAGE OF ABSORBENT COTTON OR RAYON FIBERS CONSTITUTING THE LONGITUDINAL THREAD OF SAID BANDAGE, AND REINFORCING FIBERS OF GLASS YARN COATED WITH POLYVINYL CHLORIDE, OR POLYETHYLENE CONSTITUTING THE TRANSVERSE FIBERS OF SAID BANDAGES. CONSTITUTING THE TRANSVERSE FIBERS OF SAID BANDAGES.
Claim 2
Dependent Claim
50 words
A MEDICAL PLASTER CAST COMPRISING GYPSUM REINFORCED WITH A WOVEN BANDAGE OF ABSORBENT COTTON OR RAYON FIBERS CONSTITUTING THE LONGITUDINAL THREAD OF SAID BANDAGE, AND REINFORCING FIBERS OF GLASS YARN COATED WITH POLYVINYL CHLORIDE, OR POLYETHYLENE CONSTITUTING THE TRANSVERSE FIBERS OF SAID BANDAGES. CONSTITUTING THE TRANSVERSE FIBERS OF SAID BANDAGES.
Claim 3
Dependent Claim
22 words
The cast of claim 1 wherein the bandage has fibres spaced at intervals of about 4 to about 30 ends per inch.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |