Patent US3287539A successfully refreshed from Google Patents.
US3287539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube welding by rotating arc
Assignee: Foster Wheeler Inc
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Filing: 1966-03-23
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Granted: 1966-11-22
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Expires: 1986-03-23
Abstract
No abstract record available.
Inventors
- 👤 Stevens Alan Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:28
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF MAKING A RING-SHAPED BUTT WELD BETWEEN TWO TUBES COMPRISING THE STEPS OF HOLDING SAID TUBES AXIALLY ALIGNED WITH A SPACE BETWEEN THEIR ENDS TO BE WELDED, SURRONDING AT LEAST PART OF EACH TUBE WITH A COIL, CONNECTING ONE END OF EACH OF SAID COILS TO THE TUBE IT SURROUNDS AND SUPPLYING A SOURCE OF WELDING CURRENT BETWEEN THE OTHER ENDS OF SAID COILS, STRIKING AN ARC BETWEEN SAID ENDS OF SAID TUBES, SO THAT THE MAGNETIC FIELD PRODUCED BY SAID COILS CAUSES SAID ARC TO TRAVEL AROUND SAID SPACE BETWEEN SAID ENDS OF SAID TUBES TO HEAT SAID ENDS, SWITCHING OFF SAID WELDING CURRENT AND IMMEDIATELY BRINGING SAID ENDS OF SAID TUBES TOGETHER TO UNITE THEM.
Claim 2
Independent Claim
119 words
A METHOD OF MAKING A RING-SHAPED BUTT WELD BETWEEN TWO TUBES COMPRISING THE STEPS OF HOLDING SAID TUBES AXIALLY ALIGNED WITH A SPACE BETWEEN THEIR ENDS TO BE WELDED, SURRONDING AT LEAST PART OF EACH TUBE WITH A COIL, CONNECTING ONE END OF EACH OF SAID COILS TO THE TUBE IT SURROUNDS AND SUPPLYING A SOURCE OF WELDING CURRENT BETWEEN THE OTHER ENDS OF SAID COILS, STRIKING AN ARC BETWEEN SAID ENDS OF SAID TUBES, SO THAT THE MAGNETIC FIELD PRODUCED BY SAID COILS CAUSES SAID ARC TO TRAVEL AROUND SAID SPACE BETWEEN SAID ENDS OF SAID TUBES TO HEAT SAID ENDS, SWITCHING OFF SAID WELDING CURRENT AND IMMEDIATELY BRINGING SAID ENDS OF SAID TUBES TOGETHER TO UNITE THEM.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |