US3370150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding apparatus and method
Assignee: LEONARD CONCRETE PIPE Co
•
Filing: 1965-07-07
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Granted: 1968-02-20
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Expires: 1985-07-07
Abstract
No abstract record available.
Inventors
- 👤 Nordgren Alfred Alling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:23
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; B23K11/008; B23K11/0086
Claims Analysis
Total Claims: 0
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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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |