US4151238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam insulated conductor
Assignee: KM Kabelmetal AG
•
Filing: 1977-02-23
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Granted: 1979-04-24
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Expires: 1997-02-23
Abstract
Abstract Foam insulated conductor is produced by heating the conductor to a temperature at which the conductor retains sufficient heat to effect crosslinking and foaming of a polymer composition, followed by extruding the polymer composition onto the conductor, with the crosslinking and foaming being effcted by the retained heat.
Inventors
- 👤 Gerhard Ziemek
- 👤 Bernd Eilhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:42
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/05; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10S264/18; Y10S264/65
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A process for producing a foam insulated conductor, comprising: heating a conductor to a temperature of over 200° C. at which the conductor retains sufficient heat to effect heating of a subsequently applied polymer composition to a temperature at which crosslinking and foaming of the polymer is effected: applying to the conductor in an extruder a polymer composition containing a polymer to be foamed and crosslinked, crosslinking agent and foaming agent, said polymer composition being applied in an uncrosslinked and unfoamed form; and subsequent to the application, heating the polymer composition on the conductor by the heat content of the conductor to a temperature at which the polymer is crosslinked and foamed to produce a crosslinked, foamed insulated conductor.
Claim 2
Dependent Claim
119 words
A process for producing a foam insulated conductor, comprising: heating a conductor to a temperature of over 200° C. at which the conductor retains sufficient heat to effect heating of a subsequently applied polymer composition to a temperature at which crosslinking and foaming of the polymer is effected: applying to the conductor in an extruder a polymer composition containing a polymer to be foamed and crosslinked, crosslinking agent and foaming agent, said polymer composition being applied in an uncrosslinked and unfoamed form; and subsequent to the application, heating the polymer composition on the conductor by the heat content of the conductor to a temperature at which the polymer is crosslinked and foamed to produce a crosslinked, foamed insulated conductor.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein crosslinking is effected prior to foaming.
Claim 4
Dependent Claim
26 words
The process of claim 1 and further comprising additionally heating the applied composition from the outside to effect crosslinking and foaming of the outer skin portion.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein the polymer is polyethylene.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the conductor is a wire.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the unfoamed polymer composition is applied at a uniform layer thickness of from 30 to 50 μm.
References Cited (Backward Citations)
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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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |