US3657809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making thin metal tubing
Assignee: KM Kabelmetal AG
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Filing: 1968-09-13
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Granted: 1972-04-25
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Expires: 1988-09-13
Abstract
Abstract A process for making thin metal tubing as a sheath for electrical cable or as a conduit, wherein very thin metal foil is continuously converted into tubular sheathing as over an electrical cable core, the longitudinal edges of the foil being overlapped and welded, with the immediate application thereafter of a thermoplastic copolymer coating which is tightly adherent to the metal surface of the sheathing, the composite metal foilplastic tubing having substantially increased mechanical strength.
Inventors
- 👤 Gunther Lehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49123; Y10T29/49826; Y10T29/49888; Y10T29/53; Y10T29/53126; Y10T29/5313; Y10T29/532
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
A process as in claim 1 wherein the copolymer is a polyethylene copolymer having monomer additives.
Claim 2
Dependent Claim
18 words
A process as in claim 1 wherein the copolymer coating is applied to the tubular body by extrusion.
Claim 3
Dependent Claim
20 words
A process as in claim 1 wherein said metal tape has a thickness ranging from 0.005 mm to 0.1 mm.
Claim 4
Dependent Claim
21 words
A process as in claim 1 wherein said metal tape has a thickness ranging from about 0.05 mm to 0.1 mm.
Claim 5
Dependent Claim
16 words
A process as in claim 1 wherein said tape is folded about an electrical cable core.
Claim 6
Dependent Claim
11 words
A process as in claim 1 wherein said tape is copper.
Claim 7
Dependent Claim
25 words
A process as in claim 6 wherein a paper tape is passed continuously between said cable core and said tape in the welding area thereof.
References Cited (Backward Citations)
US1794902A
Cited
US2156934A
Cited
DE910072C
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US2697769A
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US2697772A
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US2797288A
Cited
US3011933A
Cited
US3095643A
Cited
US3332138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |