Patent US3596046A successfully refreshed from Google Patents.
US3596046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of steel tubes from steel strip by electron bombardment
Assignee: Vallourec Usines a Tubes de Lorraine Escaut SA
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Filing: 1969-01-22
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Granted: 1971-07-27
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Expires: 1989-01-22
Abstract
Abstract The invention relates to a process for the manufacture of steel tubes from steel strip by electron bombardment in vacuo. Vacuum is applied to one end of a tube, the other end being open. The welding operation taking place at the end adjacent the application of vacuum. A sleeve is provided inside the tube to ensure a sufficient degree of vacuum at the welding position.
Inventors
- 👤 Jacques Jean Lucien Valleins
- 👤 Bernard Max Eugene Begue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:13
CPC Classifications
B; B23; B23K; B23K15/00; B23K15/0046; B23K15/0053; B23K15/006; B23K2101/00; B23K2101/04; B23K2101/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
A welding station as defined in claim 1 wherein said means near the end of each sleeve includes a seal engaging the interior of the sleeve and the exterior of the tube.
Claim 2
Dependent Claim
33 words
A welding station as defined in claim 1 wherein said means near the end of each sleeve includes means for creating a partial vacuum in the space between the sleeve and the tube.
Claim 3
Dependent Claim
27 words
A welding station as defined in claim 1 wherein said sealing means inside the tube each includes a plastic cylindrical element having a low coefficient of friction.
Claim 4
Dependent Claim
45 words
A welding station as defined in claim 1 including an elongated member extending along the length of and inside the tube, a tool carried by said member for scraping the weld bead from said tube, said member also carrying said sealing means inside the tube.
Claim 5
Dependent Claim
16 words
A welding station as defined in claim 1 wherein said protective means includes a molybdenum bar.
Claim 6
Dependent Claim
42 words
A welding station as defined in claim 1 including an elongated member extending along the length of and inside the tube, a tool carried by said member for scraping the weld bead from said tube, said member also carrying said protective means.
Claim 7
Dependent Claim
69 words
A welding station as defined in claim 1 in combination with means in advance of the welding station for separating the longitudinal edges of the tube to open the latter, means in advance of said gun for positioning the longitudinal edges of the tube with respect to the beam from said gun, and means between said positioning means and said gun for closing the tube immediately prior to welding.
Claim 8
Dependent Claim
63 words
A welding station as defined in claim 8 including an elongated member extending along the length of and inside the tube, said member entering the tube through the opening provided by said edge separating means, a tool carried by said member for scraping the weld bead from said tube, said member also carrying said sealing means inside the tube and said protective means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |