Patent US3572047A successfully refreshed from Google Patents.
Patent US4035129A successfully refreshed from Google Patents.
US4035129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous curing device for longitudinally extended products
Assignee: Nokia Oyj
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Filing: 1976-07-20
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Granted: 1977-07-12
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Expires: 1996-07-20
Abstract
Abstract An apparatus for continuous curing (vulcanization) of elongated products, such as cables comprising a conductor surrounded by a mantle of a crosslinkable material. The apparatus comprises a curing tube through which the cable is passed longitudinally. The curing tube comprises a heating zone in which the cable is subjected to heating for heating the cable to curing temperature in a pressurized gas atmosphere and a subsequent cooling zone in which the cured cable is subjected to cooling. The curing tube is coupled to at least one electric currency source so that the wall of the curing tube is heated due to the electric resistance of the wall material to form within the heating zone a heated mantle uniformly surrounding the cable and radiating heat thereto.
Inventors
- 👤 Jukka Seppo Karppo
- 👤 Matti Akseli Aaltonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:24
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/04; B29C35/06; B29C35/065; B29C48/00; B29C48/03; B29C48/05; B29C48/15; B29C48/154; B29C48/25; B29C48/30; B29C48/32; B29C48/34; H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; B29C48/06; B29K; B29K2021/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A device for the continuous curing of longitudinally extended crosslinkable products, such as cables, consisting of a curing tube through which the product undergoing crosslinking is drawn, and which comprises a heating zone, a cooling zone, the necessary equipment for heating the product in the heating zone up to the crosslinking temperature and the equipment for cooling the crosslinked product in the cooling zone, characterised in that wherein the curing tube itself is connected to at least one voltage supply so that the walls of the curing tube function as an electrical resistance in order to heat the tube material, thus forming a heating mantle which radiates heat to the crosslinkable product.
Claim 2
Independent Claim
112 words
A device for the continuous curing of longitudinally extended crosslinkable products, such as cables, consisting of a curing tube through which the product undergoing crosslinking is drawn, and which comprises a heating zone, a cooling zone, the necessary equipment for heating the product in the heating zone up to the crosslinking temperature and the equipment for cooling the crosslinked product in the cooling zone, characterised in that wherein the curing tube itself is connected to at least one voltage supply so that the walls of the curing tube function as an electrical resistance in order to heat the tube material, thus forming a heating mantle which radiates heat to the crosslinkable product.
Claim 3
Dependent Claim
39 words
A device in accordance with claim 1, wherein the curing tube is connected to a voltage supply at the opposite ends of the heating zone in order to form a uniform heating mantle extending over the whole heating zone.
Claim 4
Dependent Claim
41 words
A device in accordance with claim 1, wherein the curing tube consists of axially adjacent tube sections in the heating zone, each of which is separately connected to its own voltage supply in order to form several independent adjacent heating mantles.
Claim 5
Independent Claim
44 words
A device in accordance with claims 2, wherein the curing tube or the corresponding tube sections are surrounded by an outer concentric mantle tube or the corresponding mantle tubes, within the heating zone, in order to form a ring-shaped channel for the cooling air.
Claim 6
Dependent Claim
34 words
A device in accordance with claim 4, wherein the curing tube or the corresponding tube sections are connected to a voltage supply by means of a mantle tube which forms the coolant air channel.
Claim 7
Dependent Claim
40 words
A device in accordance with claim 1, wherein the curing tube or the corresponding tube sections within the heating zone are equipped with inlet and outlet connections in order to direct inert gas in and out of the curing tube.
Claim 8
Dependent Claim
38 words
A device in accordance with claim 1, wherein a container is located after the heating zone and surrounding the curing tube, which is equipped with inlet and outlet connections for the cooling liquid employed for the curing tube.
References Cited (Backward Citations)
US3588954A
Cited
US3645656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |