US2994348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reinforcing and welding toroidal or spiral shaped vessels
Assignee: Dominion Bridge Co Ltd
•
Filing: 1957-09-11
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Granted: 1961-08-01
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Expires: 1977-09-11
Abstract
No abstract record available.
Inventors
- 👤 Cape Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:06
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE283156C
Cited
US1483995A
Cited
US1526917A
Cited
US1537404A
Cited
GB254464A
Cited
US2392967A
Cited
US2837810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |