Patent US3720994A successfully refreshed from Google Patents.
US3720994A
Expired / Lapsed
US
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Method of forming metal tubing
Assignee: KM Kabelmetal AG
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Filing: 1971-11-23
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Granted: 1973-03-20
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Expires: 1991-11-23
Abstract
Abstract A method of forming metal tubing from very thin metal tape, wherein the tape is folded about a non-metallic tubing to convert the same into tubular form; the marginal edge portions of the tape providing tab portions extending radially and in contacting relation, the tab portions being metallically integrated at their outer edges and then folded about the base thereof into contact with the outer surface of the metal tubing; the non-metallic tubing being selectively (1) removed from the formed metal tubing; or (2) retained to form a liner for the metal tubing.
Inventors
- 👤 R Wagele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:03
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/045; B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; B21C37/10; B29; B29C; B29C63/00; B29C63/26; F16L2011/047; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
The method of forming metal tubing from a metal tape having a thickness not exceeding 0.30 mm. comprising moving a nOn-metallic tubing in a longitudinal path, continuously folding said tape about the outer surface of said non-metallic tubing and bringing longitudinal marginal portions of said tape into face to face relation to form a longitudinally extending radial tab, metallically integrating the longitudinal exposed edges only of said tab to form a fluid proof seam while leaving said tab of uniform thickness from the base to the outer edge thereof, folding said tab at the base thereof into contact with outer surface portions of said folded tape, and applying a synthetic resin coating in bonding relation to the outer surface of said folded tape.
Claim 2
Independent Claim
123 words
The method of forming metal tubing from a metal tape having a thickness not exceeding 0.30 mm. comprising moving a nOn-metallic tubing in a longitudinal path, continuously folding said tape about the outer surface of said non-metallic tubing and bringing longitudinal marginal portions of said tape into face to face relation to form a longitudinally extending radial tab, metallically integrating the longitudinal exposed edges only of said tab to form a fluid proof seam while leaving said tab of uniform thickness from the base to the outer edge thereof, folding said tab at the base thereof into contact with outer surface portions of said folded tape, and applying a synthetic resin coating in bonding relation to the outer surface of said folded tape.
Claim 3
Dependent Claim
26 words
The method as in claim 1 and further including the step of removing the non-metallic tubing from the metal tubing formed by the folded metal tape.
Claim 4
Dependent Claim
40 words
The method as in claim 1 and further including the step of applying an adhesive coating between the opposed surface portions of said non-metallic tubing and said folded metal tape, whereby to bond said non-metallic tubing to the metal tubing.
Claim 5
Dependent Claim
14 words
The method as in claim 3, wherein said non-metallic tubing is formed of polyamide.
Claim 6
Dependent Claim
14 words
The method as in claim 3, wherein said non-metallic tubing is formed of polytetrafluorethylene.
Claim 7
Dependent Claim
31 words
The method as in claim 3, wherein the exposed edges of said tab are welded together, said adhesive coating being thermoresponsive and set to a bonding condition by the welding step.
Claim 8
Dependent Claim
37 words
The method as in claim 1, wherein said synthetic resin coating is a monomer-polyethylene copolymer and further including the step of applying a jacketing layer of synthetic resin to the outer surface of said synthetic resin coating.
Claim 9
Dependent Claim
20 words
The method as in claim 1, wherein said non-metallic tubing has a wall thickness of from 1.0 to 3.0 mm.
References Cited (Backward Citations)
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US2066025A
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US3332138A
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US3657809A
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US3639970A
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US3692063A
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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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |