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US5219003A
Expired / Lapsed
US
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Multi-layered tubes having impact resistance-modified polyamide layers
Assignee: Uhde Inventa Fischer AG
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Filing: 1991-02-27
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Granted: 1993-06-15
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Expires: 2011-02-27
Abstract
Abstract Cold impact-resistant tubing especially useful as a fuel line for motor vehicles which is stable in length, has a brief thermal overload capacity, and consists of at least three layers of at least two different mutually compatible polyamides. The tubing also preferably has an internal and an external layer of impact resistance-modified polyamide, with or without a plasticizer, and a barrier between the layers of impact resistance modifier-free homopolyamide, copolyamide or blends thereof.
Inventors
- 👤 Franz Kerschbaumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:58
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/12; F16L9/00; F16L9/12; F16L9/133; B; B60; B60K; B60K15/00; B60K15/01
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
A tube for conveying motor vehicle engine fuel comprising three layers having a combined thickness, said three layers including a barrier, an external layer and an internal layer, each of said three layers are made of polyamides where at least two of the polyamides are different and mutually compatible materials, said internal and external layers are of impact resistance-modified polyamide, and said barrier is a polyamide having substantially no impact resistance modifier.
Claim 2
Dependent Claim
72 words
A tube for conveying motor vehicle engine fuel comprising three layers having a combined thickness, said three layers including a barrier, an external layer and an internal layer, each of said three layers are made of polyamides where at least two of the polyamides are different and mutually compatible materials, said internal and external layers are of impact resistance-modified polyamide, and said barrier is a polyamide having substantially no impact resistance modifier.
Claim 3
Dependent Claim
28 words
The tube of claim 1 wherein said internal and external layers are of impact resistance-modified polyamide, and said barrier is a polyamide having substantially no impact resistance modifier.
Claim 4
Dependent Claim
13 words
The tube of claim 1 wherein said internal and external layers contain plasticizers.
Claim 5
Dependent Claim
12 words
The tube of claim 1 wherein said barrier is of polyamide 6,6.
Claim 6
Dependent Claim
20 words
The tube of claim 1 wherein said barrier is a blend of at least one polyamide elastomer and a copolyamide.
Claim 7
Dependent Claim
11 words
The tube of claim 5 wherein said elastomer is a polyetheresteramide.
Claim 8
Dependent Claim
18 words
The tube of claim 5 wherein said copolyamide is derived from monomers having 6 to 12 carbon atoms.
Claim 9
Dependent Claim
16 words
The tube of claim 1 wherein said internal and external layers are of substantially equal thicknesses.
Claim 10
Dependent Claim
18 words
The tube of claim 1 wherein said internal and external layers are 0.2 to 1.0 mm in thickness.
Claim 11
Dependent Claim
19 words
The tube of claim 1 wherein said barrier has a thickness of 5% to 25% of said combined thickness.
Claim 12
Dependent Claim
17 words
The tube of claim 1 wherein said barrier has a wall thickness of 0.1 to 0.5 mm.
Claim 13
Dependent Claim
25 words
The tube of claim 5 wherein said internal layer is of impact resistance-modified polyamide 6 and said external layer is of impact resistance-modified polyamide 12.
Claim 14
Dependent Claim
25 words
The tube of claim 6 wherein said internal layer is of impact resistance-modified polyamide 6 and said external layer is of impact resistance-modified polyamide 12.
Claim 15
Dependent Claim
25 words
The tube of claim 7 wherein said internal layer is of impact resistance-modified polyamide 6 and said external layer is of impact resistance-modified polyamide 12.
Claim 16
Dependent Claim
17 words
The tube of claim 4 wherein said internal and external layers are of impact resistance-modified polyamide 6.
Claim 17
Dependent Claim
12 words
The tube of claim 1 produced by co-extrusion of said three layers.
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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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |