Patent US4234624A successfully refreshed from Google Patents.
US4234624A
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US
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Method of applying an insulation of cross-linked polymer on a cable conductor
Assignee: Pfizer Italia SRL
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Filing: 1979-03-01
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Granted: 1980-11-18
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Expires: 1999-03-01
Abstract
Abstract An insulation of cross-linked polymer is extruded about a cable conductor and cross-linked by means of heating in a vulcanization tube. The heating is effected by radiation energy, at least the main part of the radiation having wavelengths between 0.76 μm and 4 μm and a tube which is permeable to the radiation being used as vulcanization tube.
Inventors
- 👤 Gustaf Linderoth
- 👤 Karl-Gunnar Wiberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:31
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B13/145; B; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/10; B29C48/00; B29C48/03; B29C48/06; B29C48/25; B29C48/30; B29C48/304; B29C48/88; B29C48/91; H01B13/141; B29C35/0805; B29C2035/0822; B29K; B29K2105/00; B29K2105/06; B29K2105/20; B29L; B29L2031/00; B29L2031/34; B29L2031/3462
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
In a method of applying an insulation of cross-linked polymer onto a cable conductor in which a cross-linkable polymer is extruded around the cable conductor and thereafter cross-linked by the simultaneous application of heat and pressure in a vulcanization tube, the improvements of heating the cross-linkable polymer by use of radiation energy having at least its main portion with wavelengths of between 0.76 and 4 microns, locating the radiation energy generating means outside of the vulcanization tube, and utilizing a vulcanization tube which is pervious to the said radiation energy so as to allow its passage therethrough.
Claim 2
Dependent Claim
97 words
In a method of applying an insulation of cross-linked polymer onto a cable conductor in which a cross-linkable polymer is extruded around the cable conductor and thereafter cross-linked by the simultaneous application of heat and pressure in a vulcanization tube, the improvements of heating the cross-linkable polymer by use of radiation energy having at least its main portion with wavelengths of between 0.76 and 4 microns, locating the radiation energy generating means outside of the vulcanization tube, and utilizing a vulcanization tube which is pervious to the said radiation energy so as to allow its passage therethrough.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein pressure on the extruded polymer is achieved by pressing the extruded polymer against the inner wall of the utilized vulcanization tube.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein an intermediate lubricant is sprayed between the extruded polymer and the inner wall of the utilized vulcanization tube.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the pressure on the polymer is achieved by supplying a pressurized gas between the extruded polymer and the inner wall of the utilized vulcanization tube.
Claim 6
Dependent Claim
32 words
The method of claim 1 wherein prior to the application of the cross-linkable polymer onto the cable conductor, a layer containing a conducting type carbon black is applied around the cable conductor.
Claim 7
Dependent Claim
20 words
The method of claim 1 including the additional step of extruding an outer conducting layer onto the cross-linked polymer layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |