Patent US2669639A successfully refreshed from Google Patents.
US2669639A
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Method and apparatus for the production of welded tubing
Assignee: TRENT TUBE Co
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Filing: 1952-02-29
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Granted: 1954-02-16
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Expires: 1972-02-29
Abstract
No abstract record available.
Inventors
- 👤 Howard J Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:25
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/025; B23K9/0253
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1354593A
Cited
US1467792A
Cited
US2209637A
Cited
US2205425A
Cited
GB616117A
Cited
US2496188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |