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Patent US2538437A successfully refreshed from Google Patents.
US2538437A
Expired / Lapsed
US
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Railway sleeper
Assignee: Individual
•
Filing: 1946-04-17
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Granted: 1951-01-16
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Expires: 1966-04-17
Abstract
No abstract record available.
Inventors
- 👤 Bagon Abram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:37
CPC Classifications
E; E01; E01B; E01B3/00; E01B3/28; E01B3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US445063A
Cited
US826262A
Cited
US1009555A
Cited
US1040371A
Cited
US1073256A
Cited
US1285723A
Cited
US1410185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |