US4923724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite articles
Assignee: Akzo Nobel UK PLC
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Filing: 1989-02-01
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Granted: 1990-05-08
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Expires: 2009-02-01
Abstract
Abstract A fabric reinforcement for use with synthetic plastics material to produce a composite article is shaped to exhibit a tubular portion having a longitudinal axis, which can be curved, and at least one flange extending in the direction of the longitudinal axis. Using up to several interlinked tubular portions and a plurality of the flanges gives wide possibilities for the shape of the fabric reinforcing elements produced. Woven or knitted fabrics can be used.
Inventors
- 👤 Gerald F. Day
- 👤 Frank Robinson
- 👤 Dennis J. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:46
CPC Classifications
D; D04; D04B; D04B1/00; D04B1/22; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/22; B29C70/222; D04B21/00; D04B21/20; D10; D10B; D10B2403/00; D10B2403/01; D10B2403/011; D10B2403/0113; D10B2403/02; D10B2403/023; D10B2403/03; D10B2403/033; D10B2403/0333; D10B2501/00; D10B2501/06; D10B2501/061; D10B2505/00; D10B2505/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1362; Y10T428/24; Y10T428/24744
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A composite article comprising a synthetic plastics material reinforced with a fabric reinforcing element, said reinforcing element comprising (a) at least three tubular portions each of which has a longitudinal axis, said tubular portions intersecting at a common junction such that said longitudinal axes extend in planes lying at an angle to one another, and (b) flanges interconnecting the tubular portions each of said flanges lying in a plane containing the longitudinal axes of the tubular portions interconnected thereby and extending in the direction of said longitudinal axes, said tubular portions and flanges comprising an integrally knitted fabric element.
Claim 2
Dependent Claim
99 words
A composite article comprising a synthetic plastics material reinforced with a fabric reinforcing element, said reinforcing element comprising (a) at least three tubular portions each of which has a longitudinal axis, said tubular portions intersecting at a common junction such that said longitudinal axes extend in planes lying at an angle to one another, and (b) flanges interconnecting the tubular portions each of said flanges lying in a plane containing the longitudinal axes of the tubular portions interconnected thereby and extending in the direction of said longitudinal axes, said tubular portions and flanges comprising an integrally knitted fabric element.
Claim 3
Dependent Claim
35 words
A composite article as claim in claim 1 in which the longitudinal axes of the tubular portions of the fabric reinforcing element extend in planes which lie at angles to one another of substantially 90°.
Claim 4
Dependent Claim
24 words
A composite article as claim in claim 1 in which the flanges of the fabric reinforcing element are of at least partly hollow form.
Claim 5
Dependent Claim
19 words
A composite article as claimed in claim 1 in which the fabric reinforcing element comprises a weft knitted fabric.
Claim 6
Dependent Claim
27 words
A composite article as claim in claim 4 in which the flanges of the fabric reinforcing element comprise weft knitted fabric formed in a double bed structure.
Claim 7
Dependent Claim
30 words
A composite article as claimed in claim 1 in which at least two of the intersecting tubular portions of the fabric reinforcing element have different cross-sectional shapes from each other.
Claim 8
Dependent Claim
26 words
A composite article as claimed in claim 1 in which a flange of the fabric reinforcing element has the shape of a minimum energy anticlastic surface.
Claim 9
Dependent Claim
65 words
A process for making a composite article as claimed in claim 1 comprising taking a knitted fabric reinforcing element of the structure specified in claim 1, inserting a former into each of the intersecting tubular portions thereof, impregnating the reinforcing element with a synthetic resin to stiffen it, at least partly curing the synthetic resin if necessary, and removing the formers from the tubular portions.
Claim 10
Dependent Claim
32 words
A process as claimed in claim 8 in which a tubular portion is stretched by the insertion of a former which is slightly larger than the relaxed size of the tubular portion.
Claim 11
Dependent Claim
35 words
A process as claimed in claim 9 in which two intersecting tubular portions are stretched by the insertion of formers thereby tensioning the flange interconnecting them into the shape of a minimum energy anticlastic surface.
Claim 12
Dependent Claim
57 words
A process as claimed in claim 8 in which, after removal of the former, the composite article is impregnated or embedded in a further synthetic resin which is the same as or is compatible with the synthetic resin with which the fabric reinforcing element has already been impregnated and this further synthetic resin is cured if necessary.
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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |