US3910315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical metallic tubing
Assignee: WHEELING-PITTSBURGH STEEL Corp A CORP OF
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Filing: 1974-04-19
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Granted: 1975-10-07
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Expires: 1994-04-19
Abstract
Abstract Electrical metallic tubing manufactured from galvanized steel strip by forming the strip into tubular shape and welding the edges together, is provided with a duplex replacement metal coating on the outer surface of the weld area where the zinc is volatilized or melted by the heat of welding or removed by subsequent scarfing. The replacement coating comprises an aluminum coating in contact with the steel surface and a zinc coating superimposed directly on the aluminum coating.
Inventors
- 👤 Samuel L Norteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:01
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/16; B23K11/163; B23K11/166; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; F; F16; F16L; F16L9/00; F16L9/02; H; H01; H01R; H01R4/00; H01R4/02; H01R4/029; Y; Y10; Y10S; Y10S138/00; Y10S138/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
52 words
ELECTRICAL METALLIC TUBING COMPRISING WELDED STEEL TUBING HAVING AN OUTER COATING OF ZINC IN CONTACT WITH THE STEEL TUBING EXCEPT OVER THE OUTER SURFACE OF THE WELD AREA AND OVER THAT SURFACE ONLY AN ALUMINUM COATING IN CONTACT WITH THE STEEL TUBING AND A ZINC COATING SUPERIMPOSED DIRECTLY ON THE ALUMINUM COATING.
Claim 2
Dependent Claim
52 words
ELECTRICAL METALLIC TUBING COMPRISING WELDED STEEL TUBING HAVING AN OUTER COATING OF ZINC IN CONTACT WITH THE STEEL TUBING EXCEPT OVER THE OUTER SURFACE OF THE WELD AREA AND OVER THAT SURFACE ONLY AN ALUMINUM COATING IN CONTACT WITH THE STEEL TUBING AND A ZINC COATING SUPERIMPOSED DIRECTLY ON THE ALUMINUM COATING.
Claim 3
Dependent Claim
18 words
Electrical metallic tubing of claim 1, including an inner coating of zinc thinner than said outer zinc coating.
References Cited (Backward Citations)
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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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |