US5850855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible coolant conduit and method of making same
Assignee: Uhde Inventa Fischer AG
•
Filing: 1996-02-02
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Granted: 1998-12-22
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Expires: 2016-02-02
Abstract
Abstract A flexible conduit for coolant having a high bursting pressure above 8 bar at 100° C. and high hydrolysis resistance comprising an outer layer of a material selected from the group consisting of homopolyamides, copolyamides and mixtures thereof with an excess of amino terminal groups, a non-swelling inner layer made of a material selected from the group consisting of non-halogenated copolyolefins, non-halogenated homopolyolefins and mixtures thereof and a middle layer compatible with the inner and outer layers made of a homopolyolefin or a copolyolefin with grafted functional groups, the layers being coextruded and corrugated during coextrusion.
Inventors
- 👤 Franz Kerschbaumer
- 👤 Wolfgang Pfleger
- 👤 Georg Stoeppelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:02
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/14; F16L11/15; Y; Y10; Y10S; Y10S138/00; Y10S138/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A flexible conduit for cooling having a high bursting pressure above 8 bar at 100° C. and high hydrolysis resistance comprising an outer layer of a material selected from the group consisting of homopolyamides, copolyamides and mixtures thereof with an excess of amino terminal groups, a non-swelling inner layer made of a material selected from the group consisting of non-halogenated copolyolefins, non-halogenated homopolyolefins and mixtures thereof and a middle layer compatible with the inner and outer layers made of a homopolyolefin or a copolyolefin with grafted functional groups, the layers being coextruded and corrugated during coextrusion.
Claim 2
Dependent Claim
96 words
A flexible conduit for cooling having a high bursting pressure above 8 bar at 100° C. and high hydrolysis resistance comprising an outer layer of a material selected from the group consisting of homopolyamides, copolyamides and mixtures thereof with an excess of amino terminal groups, a non-swelling inner layer made of a material selected from the group consisting of non-halogenated copolyolefins, non-halogenated homopolyolefins and mixtures thereof and a middle layer compatible with the inner and outer layers made of a homopolyolefin or a copolyolefin with grafted functional groups, the layers being coextruded and corrugated during coextrusion.
Claim 3
Dependent Claim
29 words
A flexible conduit of claim 1 wherein the outer layer is polyamide 12, the inner layer is crosslinked polyethylene and the middle layer is polyethylene grafted with functional groups.
Claim 4
Dependent Claim
40 words
A flexible conduit of claim 2 wherein the outer layer is polyamide 12 with an excess of amino terminal groups, the inner layer is polyethylene crosslinked with silane and the middle layer is high density polyethylene grafted with maleic anhydride.
Claim 5
Dependent Claim
21 words
A conduit of claim 1 wherein the outer layer is 25 to 95% of the total wall thickness of the conduit.
Claim 6
Dependent Claim
41 words
The conduit of claim 1 wherein said homopolyamides and copolyamides are monomers selected from the group consisting of linear aliphatics of 6 to 12 carbon atoms, aromatics of 6 to 10 carbon atoms and cycloaliphatics of 6 to 20 carbon atoms.
Claim 7
Dependent Claim
30 words
The conduit of claim 1 wherein said outer layer is of polyamide 6 and said inner layer is of a copolyolefin having α-unsaturated dicarboxylic acids or derivatives thereof grafted thereon.
Claim 8
Dependent Claim
13 words
The conduit of claim 1 having an internal diameter greater than 5 mm.
Claim 9
Dependent Claim
13 words
The conduit of claim 1 having a wall thickness greater than 0.4 mm.
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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) | 2001-12-21 | 2002-06-22 | 2002-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-21 | 2006-06-22 | 2006-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-21 | 2010-06-22 | 2010-12-22 | $7700.00 | Window Closed / Lapsed |