Patent US2408291A successfully refreshed from Google Patents.
US2408291A
Expired / Lapsed
US
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Welding material and process
Assignee: Electric Railway Improvement Co
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Filing: 1944-02-03
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Granted: 1946-09-24
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Expires: 1964-02-03
Abstract
No abstract record available.
Inventors
- 👤 Charles A Cadwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:36
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/34; B23K28/00; B23K28/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-09-23 | 1950-03-25 | 1950-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-23 | 1954-03-25 | 1954-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-23 | 1958-03-25 | 1958-09-24 | $7700.00 | Window Closed / Lapsed |