Patent US3920049A successfully refreshed from Google Patents.
US3920049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced plastics tube
Assignee: Bayer AG
•
Filing: 1973-01-16
•
Granted: 1975-11-18
•
Expires: 1993-01-16
Abstract
Abstract A plastics tube comprises a duroplastic material with a fiber reinforcement of at least one tubular, endless knitted fabric impregnated with the duroplastic material, wherein the ends of the tube are provided with flanges, the endless tubular knitted fabric extending radially outwards into the flange and being impregnated with a circular insert.
Inventors
- 👤 Axel Lippert
- 👤 Siegfried Joisten
- 👤 Johannes-Otto Sajben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:51
CPC Classifications
B; B29; B29C; B29C57/00; F; F16; F16L; F16L33/00; F16L33/28; F16L9/00; F16L9/12; F16L9/133; Y; Y10; Y10S; Y10S138/00; Y10S138/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A fibre-reinforced plastic tube, comprising a duroplastic material with a fibre reinforcement composed of at least one tubular, seamless knitted fabric impregnated with the duroplastic material, wherein the ends of the tube are provided with flanges, the tubular knitted fabric extending radially outwards in a plane substantially perpendicular to the axis of the tube, a circular insert disposed concentrically about said tube and laid up on, and forming a backing and support for the part of the knitted fabric which extends radially outwardly, the radially outwardly extending knitted fabric, being impregnated with a duroplastic material, the radially outwardly extending fabric, its impregnating material, and the circular insert being combined to form the flange.
Claim 2
Dependent Claim
113 words
A fibre-reinforced plastic tube, comprising a duroplastic material with a fibre reinforcement composed of at least one tubular, seamless knitted fabric impregnated with the duroplastic material, wherein the ends of the tube are provided with flanges, the tubular knitted fabric extending radially outwards in a plane substantially perpendicular to the axis of the tube, a circular insert disposed concentrically about said tube and laid up on, and forming a backing and support for the part of the knitted fabric which extends radially outwardly, the radially outwardly extending knitted fabric, being impregnated with a duroplastic material, the radially outwardly extending fabric, its impregnating material, and the circular insert being combined to form the flange.
Claim 3
Dependent Claim
43 words
A plastic tube as claimed in claim 1 wherein the knitted fabric extends beyond the circular insert and surrounds the insert, and the last mentioned extension of the knitted fabric is also impregnated with a duroplast material and forms part of the flange.
Claim 4
Dependent Claim
25 words
A plastic tube as claimed in claim 2, wherein the insert comprises of a fabric or fibre preform and is impregnated with the duroplastic material.
Claim 5
Dependent Claim
25 words
A plastic tube as claimed in claim 1, wherein the insert consists of a fabric or fibre preform and is impregnated with the duroplastic material.
Claim 6
Dependent Claim
11 words
A plastic tube according to claim 1 comprising an inner liner.
Claim 7
Dependent Claim
84 words
A plastic tube according to claim 1, the tube comprising a plurality of said tubular, knitted fabrics arranged in layers and impregnated with said duroplast material, a plurality of the knitted fabrics extending radially outwards in planes substantially perpendicular to the axis of the tube, said circular insert backing and supporting the part of the knitted fabrics which extend radially outwardly, the radially outwardly extending knitted fabrics being impregnated with the duroplast material, and with the impregnating material and the insert forming the flange.
Claim 8
Dependent Claim
22 words
A plastic tube according to claim 1, the radially outwardly extending fabric extending substantially over the entire radial width of the flange.
Claim 9
Dependent Claim
22 words
A plastic tube according to claim 6, the radially outwardly extending fabrics extending substantially over the entire radial width of the flange.
References Cited (Backward Citations)
US1696435A
Cited
US2752952A
Cited
US2783173A
Cited
US2862524A
Cited
US3037798A
Cited
US3093160A
Cited
US3104839A
Cited
US3305251A
Cited
US3365203A
Cited
US3654967A
Cited
US3812885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |