US4499716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforcement structure
Assignee: EIDP Inc
•
Filing: 1983-06-13
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Granted: 1985-02-19
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Expires: 2003-06-13
Abstract
Abstract Reinforcement structure with enhanced compressive strength is obtained by wrapping a yarn helically around a core of longitudinally aligned yarn to form a sheath that compresses the core, the yarn of both sheath and core having a tenacity greater than 10 dN/tex and an initial modulus greater than 200 dN/tex.
Inventors
- 👤 Paul S. Antal
- 👤 Manfred Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:04
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/447; D02G3/22; D02G3/36; D02G3/40; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A reinforcement structure consisting of a core surrounded by a sheath, said core being under at least 0.1% radial compression and comprising longitudinally aligned yarn and said sheath comprising a helical wrapping of yarn with adjacent turns of the helical wrapping abutting and being positioned at an angle to the core of between 80 and 90 degrees, the ratio of sheath thickness to the radius of the reinforcement structure being from 0.01 to 0.25, and the yarn of both sheath and core having a tenacity greater than 10 dN/tex, and an initial modulus greater than 200 dN/tex.
Claim 2
Dependent Claim
97 words
A reinforcement structure consisting of a core surrounded by a sheath, said core being under at least 0.1% radial compression and comprising longitudinally aligned yarn and said sheath comprising a helical wrapping of yarn with adjacent turns of the helical wrapping abutting and being positioned at an angle to the core of between 80 and 90 degrees, the ratio of sheath thickness to the radius of the reinforcement structure being from 0.01 to 0.25, and the yarn of both sheath and core having a tenacity greater than 10 dN/tex, and an initial modulus greater than 200 dN/tex.
Claim 3
Dependent Claim
21 words
The reinforcement structure of claim 1 wherein the core contains a resin which occupies less than 75% of the core volume.
Claim 4
Dependent Claim
17 words
The reinforcement structure of claim 2 wherein the resin occupies less than 40% of the core volume.
Claim 5
Dependent Claim
16 words
The reinforcement structure of claim 1 wherein the core and sheath yarns are of organic fiber.
Claim 6
Dependent Claim
13 words
The reinforcement structure of claim 4 wherein the organic fiber is an aramid.
Claim 7
Dependent Claim
16 words
The reinforcement structure of claim 1 wherein the core and/or sheath yarns are of inorganic fiber.
Claim 8
Dependent Claim
16 words
The reinforcement structure of claim 1 wherein the core is under at least 0.5% radial compression.
Claim 9
Dependent Claim
18 words
The reinforcement structure of claim 1 wherein both the core and the sheath yarns are impregnated with resin.
Claim 10
Dependent Claim
29 words
The reinforcement structure of claim 1 having an axial coefficient of thermal expansion of less than 1 part per million within the temperature range of 30° to 100° C.
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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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |