US5474109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer conduit having a polyester layer
Assignee: Uhde Inventa Fischer AG
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Filing: 1993-04-26
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Granted: 1995-12-12
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Expires: 2013-04-26
Abstract
Abstract A multilayer polymer hose or pipe conduit which contains at least one barrier layer of polyester, which acts as a barrier to fuel being carried thereby. In a preferred form of the invention, the hose or conduit has an inner polyamide protective layer, an outer polyamide protective layer, an adhesion promotor layer between the barrier layer and the inner protective layer, and another adhesion layer between the barrier layer and the outer protective layer.
Inventors
- 👤 Georg Stoeppelmann
- 👤 Bernhard Zeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:03
CPC Classifications
F; F16; F16L; F16L11/00; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B1/00; B32B1/08; F16L11/04; F16L9/00; F16L9/12; F16L2011/047
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A multilayer, coextruded polymer hose or pipe conduit having at least one barrier layer of polybutylene terephthalate, whereby said hose or conduit exhibits a barrier effect to alcohols, aliphatic hydrocarbons, and aromatic hydrocarbons, there being at least one adhesion promoter layer adjacent at least one said barrier layer, said adhesion promoter layer comprising at least one polyurethane.
Claim 2
Dependent Claim
57 words
A multilayer, coextruded polymer hose or pipe conduit having at least one barrier layer of polybutylene terephthalate, whereby said hose or conduit exhibits a barrier effect to alcohols, aliphatic hydrocarbons, and aromatic hydrocarbons, there being at least one adhesion promoter layer adjacent at least one said barrier layer, said adhesion promoter layer comprising at least one polyurethane.
Claim 3
Dependent Claim
24 words
The hose or conduit of claim 1 wherein said polyurethane is selected form the group consisting of polyether urethanes, polyester urethanes, and mixtures thereof.
Claim 4
Dependent Claim
15 words
The hose or conduit of claim 1 wherein said barrier layer is an inner layer.
Claim 5
Dependent Claim
27 words
The hose or conduit of claim 1 which is a 3-layer conduit comprising a polybutylene terephthalate layer, a protective polyamide layer, and an adhesion promoter layer therebetween.
Claim 6
Dependent Claim
64 words
The hose or conduit of claim 1 which is a 5-layer conduit with an inner layer and an outer layer of polyamide, said barrier layer of polybutylene terephthalate between two adhesion promoter layers, one of said adhesion promotor layers being between said barrier layer and said inner layer, and another of said adhesion promotor layers being between said barrier layer and said outer layer.
Claim 7
Dependent Claim
17 words
The hose or conduit of claim 1 wherein there is at least one protective layer of polyamide.
Claim 8
Dependent Claim
44 words
The hose or conduit of claim 1 wherein there is provided at least one inner protective layer or one outer protective layer of polyamide, said adhesion promoter layer being between said polybutylene terephthalate and either said inner protective layer or said outer protective layer.
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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) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |