US2297893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail welding
Assignee: Sperry Products Inc
•
Filing: 1939-11-04
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Granted: 1942-10-06
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Expires: 1959-11-04
Abstract
No abstract record available.
Inventors
- 👤 Jones George Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:25
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; E; E01; E01B; E01B11/00; E01B11/44; E01B11/50
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) | 1945-10-05 | 1946-04-06 | 1946-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-05 | 1950-04-06 | 1950-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-05 | 1954-04-06 | 1954-10-06 | $7700.00 | Window Closed / Lapsed |