Patent EP0258036A2 successfully refreshed from Google Patents.
EP0258036A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Insulated conductor with multi-layer high temperature insulation
Assignee: Carlisle Corp
•
Filing: 1987-08-25
•
Granted: —
•
Expires: 2007-08-25
Abstract
Abstract An insulated conductor for high temperature use and methods of manufacture thereof. The conductor (1) is insulated by at least three layers of insulation, the inner layer (2) being made of a perfluoroalkoxy or a polytetrafluoroethylene resin compound, the second layer (3) being made of a polyimide resin compound and the third layer (4) being made of a perfluoroalkoxy, an ethylenetetrafluoroethylene copolymer or a polyvinylbidine fluoride resin compound. The layers are coated or extruded over the conductor and each other and preferably, the first layer is etched before the second layer is applied.
Inventors
- 👤 Norman Ralph Harlow
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 03:58
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/02; H01B7/0208; H01B13/00; H01B13/06; H01B13/14; H01B13/141; H01B7/17; H01B7/29; H01B7/292
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
101 words
An insulated conductor insulated by a plurality of superimposed layers of plastic insulation and having a temperature rating of at least 150°C, characterised by said conductor (1) having a first layer (2) of plastic insulation material therearound and in contact therewith, said plastic insulation material comprising a plastic selected from perfluoroalkoxy and polytetrafluoroethylene resins, having a second layer (3) comprising polyimide resin around said first layer (2) and having a third layer (4) of plastic insulation material around said second layer (3), the last mentioned said plastic insulation material comprising a plastic selected from perfluoroalkoxy, ehtylene-tetrafluoroethylene copolymer and polyvinylidine fluoride resins.
Claim 2
Dependent Claim
101 words
An insulated conductor insulated by a plurality of superimposed layers of plastic insulation and having a temperature rating of at least 150°C, characterised by said conductor (1) having a first layer (2) of plastic insulation material therearound and in contact therewith, said plastic insulation material comprising a plastic selected from perfluoroalkoxy and polytetrafluoroethylene resins, having a second layer (3) comprising polyimide resin around said first layer (2) and having a third layer (4) of plastic insulation material around said second layer (3), the last mentioned said plastic insulation material comprising a plastic selected from perfluoroalkoxy, ehtylene-tetrafluoroethylene copolymer and polyvinylidine fluoride resins.
Claim 3
Dependent Claim
41 words
An insulated conductor as claimed in claim 1 characterised in that said plastic insulation material of said first layer (2) and of said third layer (4) is perfluoroalkoxy resin and said insulated conductor has a temperature rating of at least 200°C.
Claim 4
Dependent Claim
39 words
An insulated conductor as claimed in claim 1 or claim 2 characterised in that said second layer (3) is in contact with said first layer (2) and said third layer (4) is in contact with said second layer (3).
Claim 5
Dependent Claim
38 words
An insulated conductor as claimed in any of claims 1 to 3 characterised by the radial thicknesses of said first layer (2) and said third layer (4) being greater than the radial thickness of said second layer (3).
Claim 6
Dependent Claim
20 words
An insulated conductor as claimed in any preceding claim characterised by the polyimide resin of said second layer being thermoset.
Claim 7
Dependent Claim
20 words
An insulated conductor as claimed in any preceding claim characterised in that at least one of said layers is thermoplastic.
Claim 8
Dependent Claim
19 words
An insulated conductor as claimed in any preceding claim characterised in that said second layer is an extruded layer.
Claim 9
Dependent Claim
25 words
An insulated conductor as claimed in any of claims 1 to 6 characterised in that at least one of said layers is an extruded layer.
Claim 10
Dependent Claim
31 words
An insulated conductor as claimed in any of claims 1 to 6 characterised in that each of said first layer, said second layer and said third layer is an extruded layer.
Claim 11
Dependent Claim
21 words
An insulated conductor as claimed in claim 1 characterised in that at least one of said layers is a coated layer.
Claim 12
Independent Claim
136 words
A method of making an insulated conductor having a temperature rating of at least 150°C, said method being characterised by: while advancing said conductor (1) lengthwise thereof, applying a first layer (2) of plastic insulation material therearound and in contact therewith, said plastic insulation material being selected from compounds of perfluoroalkoxy and of polytetrafluoroethylene; while advancing said conductor (1) lengthwise with said first layer (2) therearound, applying a second layer (3) of plastic insulation material around said first layer (2), the last-mentioned said insulation material being a polyimide compound; and while advancing said conductor (1) lengthwise with said first layer (2) and said second layer (3) therearound, applying a third layer (4) of plastic insulation material therearound, the last-mentioned said plastic material being selected from compounds of perfluoroalkoxy, of ethylene-tetrafluoroethylene copolymer and of polyvinylidine fluoride resins.
Claim 13
Independent Claim
136 words
A method of making an insulated conductor having a temperature rating of at least 150°C, said method being characterised by: while advancing said conductor (1) lengthwise thereof, applying a first layer (2) of plastic insulation material therearound and in contact therewith, said plastic insulation material being selected from compounds of perfluoroalkoxy and of polytetrafluoroethylene; while advancing said conductor (1) lengthwise with said first layer (2) therearound, applying a second layer (3) of plastic insulation material around said first layer (2), the last-mentioned said insulation material being a polyimide compound; and while advancing said conductor (1) lengthwise with said first layer (2) and said second layer (3) therearound, applying a third layer (4) of plastic insulation material therearound, the last-mentioned said plastic material being selected from compounds of perfluoroalkoxy, of ethylene-tetrafluoroethylene copolymer and of polyvinylidine fluoride resins.
Claim 14
Dependent Claim
28 words
A method as claimed in claim 11 characterised in that the outer surface of said first layer (2) is etched prior to extruding said second layer (3) therearound.
Claim 15
Dependent Claim
60 words
A method as claimed in claim 11 characterised in that said second layer (3) is applied by extruding a viscous lacquer around said first layer (2), said lacquer containing a solvent and polyimide, the weight content of the polyimide solids in the lacquer being at least 20% and wherein said solvent is removed from said second layer with heating thereof.
Claim 16
Dependent Claim
29 words
A method as claimed in claim 13 characterised in that said polyimide in said lacquer is thermoset during the heating of said second layer (3) to remove said solvent.
Claim 17
Dependent Claim
54 words
A method as claimed in claim 13 characterised in that the plastic material of said first layer is a polytetrafluoroethylene resin compound and is extruded over said conductor in paste form and wherein said first layer is heated to cause the polytetrafluoroethylene resin compound to become thermoset prior to extruding said second layer thereover.
Claim 18
Dependent Claim
39 words
A method as claimed in claim 15 characterised in that said lacquer is heated, during the heating of said second layer to remove said solvent, to a temperature and for a time which causes said polyimide to become thermoset.
Claim 19
Independent Claim
25 words
A method as claimed in any of claims 13 to 16 characterised in that the plastic material of said third layer is a perfluoroalkoxy compound.
Claim 20
Dependent Claim
25 words
A method as claimed in claim 13 characterised in that the plastic material of said first layer and said third layer is a perfluoroalkoxy compound.
Claim 21
Independent Claim
153 words
A method of applying a layer of polyimide around an elongated article (6a), said method being characterised by advancing said article (6a) lengthwise through a die (13) having a passageway therethrough for the passage of said article through said die, said passageway having an inlet end and an outlet end and said die having a cavity (17) around said passageway and adjacent the outlet and thereof for receiving a polyimide containing lacquer under pressure; while said article is advanced through said passageway, supplying a viscous lacquer comprising a solvent and at least 15% by weight of the lacquer of thermosettable polyimide solids to said cavity under a pressure sufficient to cause said lacquer to flow around said article from said cavity (17); and as said article with said lacquer therearound is advanced, treating said article with said lacquer therearound to remove said solvent and so as to cause the polyimide to become thermoset.
Claim 22
Independent Claim
153 words
A method of applying a layer of polyimide around an elongated article (6a), said method being characterised by advancing said article (6a) lengthwise through a die (13) having a passageway therethrough for the passage of said article through said die, said passageway having an inlet end and an outlet end and said die having a cavity (17) around said passageway and adjacent the outlet and thereof for receiving a polyimide containing lacquer under pressure; while said article is advanced through said passageway, supplying a viscous lacquer comprising a solvent and at least 15% by weight of the lacquer of thermosettable polyimide solids to said cavity under a pressure sufficient to cause said lacquer to flow around said article from said cavity (17); and as said article with said lacquer therearound is advanced, treating said article with said lacquer therearound to remove said solvent and so as to cause the polyimide to become thermoset.
Claim 23
Dependent Claim
22 words
A method as claimed in claim 19 characterised in that said article with said lacquer therearound is advanced along a vertical path.
Claim 24
Dependent Claim
84 words
A method as claimed in claim 19 or claim 20 wherein said die has a portion intermediate said cavity and said passageway which extends to said outlet end of said passageway and said die has a further passageway around said p[ortion and extending from said cavity to adjacent said outlet end of the first-mentioned said passageway and wherein said lacquer is caused to flow through said further passageway and around said article as it emerges from said outlet end of the first-mentioned said passageway.
Claim 25
Dependent Claim
64 words
A method as claimed in claim 19 characterised in that said passageway has its outlet end within said cavity and said cavity has an opening which is spaced from said outlet opening of said passageway in the direction of advance of said article and which opens outwardly of said die and wherein said lacquer is caused to flow around said article within said cavity.
Claim 26
Independent Claim
37 words
A method as claimed in any of claims 19 to 22 characterised in that the content of polyimide solids in said lacquer is at least 25% and said lacquer has a vixcosity of at least 200,000 centipoises.
Claim 27
Independent Claim
42 words
A method as claimed in any of claims 19 to 23 characterised in that said article with said lacquer therearound is heated at a temperature and for a time sufficient to remove said solvent and to cause the polyimide to become thermoset.
Claim 28
Dependent Claim
16 words
A method as claimed in claim 24 characterised in that said lacquer contains a cross-linking agent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.