US3173594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making helically welded tubes
Assignee: Baj Vickers Ltd
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Filing: 1961-09-18
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Granted: 1965-03-16
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Expires: 1981-09-18
Abstract
No abstract record available.
Inventors
- 👤 Napier William
- 👤 Derrick H Ranford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:16
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B23; B23K; B23K9/00; B23K9/02; B23K9/032; B23K9/0325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
APPARATUS COMPRISING A HEADSTOCK MANDREL AND A TAILSTOCK MANDREL WHICH ARE COAXIAL CYLINDERS OF EQUAL DIAMETER, MEANS FOR POSITIVELY ROTATING THE TAILSTOCK MANDREL AND MEANS FOR POSITIVELY MOVING THE TAILSTOCK MANDREL AXIALLY, MEANS ENABLING THE HEADSTOCK MANDREL TO ROTATE, MEANS FOR POSITIVELY IMPARTING LIMITED AXIAL MOVEMENT TO THE HEADSTOCK MANDREL, AN ANCHORAGE ON THE TAILSTOCK MANDREL FOR THE END OF A METAL STRIP, A GUIDE FOR STRIP APPROACHING THE HEADSTOCK MANDREL, AND A WELDING DEVICE ADJACENT TO A NORMAL POSITION OF THE HEADSTOCK MANDREL FOR FORMING A CONTINUOUS SEAM WELD BETWEEN THE ADJACENT EDGES OF SUCCESSIVE HELICAL TURNS OF STRIP.
Claim 2
Dependent Claim
100 words
APPARATUS COMPRISING A HEADSTOCK MANDREL AND A TAILSTOCK MANDREL WHICH ARE COAXIAL CYLINDERS OF EQUAL DIAMETER, MEANS FOR POSITIVELY ROTATING THE TAILSTOCK MANDREL AND MEANS FOR POSITIVELY MOVING THE TAILSTOCK MANDREL AXIALLY, MEANS ENABLING THE HEADSTOCK MANDREL TO ROTATE, MEANS FOR POSITIVELY IMPARTING LIMITED AXIAL MOVEMENT TO THE HEADSTOCK MANDREL, AN ANCHORAGE ON THE TAILSTOCK MANDREL FOR THE END OF A METAL STRIP, A GUIDE FOR STRIP APPROACHING THE HEADSTOCK MANDREL, AND A WELDING DEVICE ADJACENT TO A NORMAL POSITION OF THE HEADSTOCK MANDREL FOR FORMING A CONTINUOUS SEAM WELD BETWEEN THE ADJACENT EDGES OF SUCCESSIVE HELICAL TURNS OF STRIP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |