US3710828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular metal structure
Assignee: KM Kabelmetal AG
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Filing: 1971-01-25
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Granted: 1973-01-16
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Expires: 1991-01-25
Abstract
Abstract A tubular metal structure formed from a steel tape converted to tubular shape with the side edges thereof in abutting relation to provide a longitudinal seam which is welded. The tubing may be transversely corrugated to increase the flexibility thereof; the tubing in plain or corrugated from being useful as conduit means or as sheathing for electrical cable. The steel from which the tape is formed has a specified carbon, manganese and silicon content to improve diverse properties of the fabricated tubing, including the welded seam thereof and the welding procedure.
Inventors
- 👤 G Ziemek
- 👤 G Nordmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:13
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; H01B7/20; H01B7/207; H01B13/00; H01B13/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
A tubular structure as in claim 1 wherein said steel further includes 0.05 percent aluminum, by weight.
Claim 2
Dependent Claim
13 words
A tubular structure as in claim 1 wherein said structure is transversely corrugated.
Claim 3
Dependent Claim
22 words
A tubular structure as in claim 1 wherein said tape has a thickness of from about 0.2 mm to about 1.0 mm.
Claim 4
Dependent Claim
24 words
A tubular structure as in claim 1 wherein the carbon content is 0.03 percent and the manganese content is 0.35 percent all by weight.
Claim 5
Dependent Claim
16 words
A tubular structure as in claim 1 wherein said taPe has a thickness of 0.4 mm.
Claim 6
Dependent Claim
16 words
A tubular structure as in claim 1 wherein said tape is formed of vacuum degassed steel.
References Cited (Backward Citations)
US1813859A
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US1852921A
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US1829638A
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US2361318A
Cited
US2817364A
Cited
US2870792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |