US4398058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-proofing electrical cable
Assignee: KABEL- und METALLWERKE GUTEHOFFNUNGSHUTTE AG A CORP OF GERMANY
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Filing: 1981-03-18
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Granted: 1983-08-09
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Expires: 2001-03-18
Abstract
Abstract Three stranded-together, insulated conductors are enveloped in a rubber-elastic, inner sleeve on which sits a corrugated twin tube arrangement of an inner copper tube and an outer steel tube. The corrugations seal the interior in a bulkhead-like fashion.
Inventors
- 👤 Dieter Gerth
- 👤 Friedrich Schatz
- 👤 Cornelius van Hove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:29
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; H01B7/20; H01B7/202; H01B7/28; H01B7/282; H01B7/2825; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A moisture-proof cable, comprising: a plurality of inner conductors assembled in a stranded bundle; an insulating jacket assembly around the conductor bundle and constituting therewith a cable core; and a twin tube comprised of two thin metal strips, a first one having been longitudinally folded around the core and seam-welded along edges of the first strip, a second one of the strips having been longitudinally folded around the first one and seam-welded along its edges, the first one having a higher electrical conductivity but a lower mechanical resistance than the second, outer one, the twin tube having corrugations commonly made in situ and which extend into the jacket in order to obtain longitudinal sealing against the migration of moisture.
Claim 2
Dependent Claim
119 words
A moisture-proof cable, comprising: a plurality of inner conductors assembled in a stranded bundle; an insulating jacket assembly around the conductor bundle and constituting therewith a cable core; and a twin tube comprised of two thin metal strips, a first one having been longitudinally folded around the core and seam-welded along edges of the first strip, a second one of the strips having been longitudinally folded around the first one and seam-welded along its edges, the first one having a higher electrical conductivity but a lower mechanical resistance than the second, outer one, the twin tube having corrugations commonly made in situ and which extend into the jacket in order to obtain longitudinal sealing against the migration of moisture.
Claim 3
Dependent Claim
121 words
A moisture-proof cable, comprising: an inner conductor being comprised of a plurality of stranded-together wires; an insulating jacket assembly around the conductor and constituting therewith a cable core; and a twin tube comprised of two thin metal strips, a first one of the strips having been longitudinally folded around the core and longitudinally seam-welded along its edges, a second one of the strips having been longitudinally folded around the first one and longitudinally seam-welded along its edges, the first one having a higher electrical conductivity but a lower mechanical resistance than the second, outer one, the twin tube having corrugations commonly made in situ and which extend into the jacket in order to obtain longitudinal sealing against the migration of moisture.
Claim 4
Dependent Claim
121 words
A moisture-proof cable, comprising: an inner conductor being comprised of a plurality of stranded-together wires; an insulating jacket assembly around the conductor and constituting therewith a cable core; and a twin tube comprised of two thin metal strips, a first one of the strips having been longitudinally folded around the core and longitudinally seam-welded along its edges, a second one of the strips having been longitudinally folded around the first one and longitudinally seam-welded along its edges, the first one having a higher electrical conductivity but a lower mechanical resistance than the second, outer one, the twin tube having corrugations commonly made in situ and which extend into the jacket in order to obtain longitudinal sealing against the migration of moisture.
Claim 5
Dependent Claim
22 words
A cable as in claim 1 or 2, the outer tube being made of steel, the inner one of copper or aluminum.
Claim 6
Dependent Claim
21 words
A cable as in claim 3, the strips having a thickness in the range of from 0.2 mm to 1.2 mm.
Claim 7
Dependent Claim
21 words
A cable as in claim 3, the strips having a thickness in the range of from 0.4 mm to 0.8 mm.
Claim 8
Dependent Claim
30 words
A cable as in claim 1 or 2, wherein corrugations grooves of the twin tube are annular grooves, being forced into said jacket, the jacket being of an elastic material.
Claim 9
Dependent Claim
19 words
A cable as in claim 1 or 2, wherein the outer tube has been drawn onto the inner tube.
Claim 10
Dependent Claim
34 words
A cable as in claim 1 or 2, the jacket assembly including a relatively inelastic material on the core, the space in between corrugations and the latter material being filled with a moisture sealer.
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |