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US2678166A
Expired / Lapsed
US
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Reinforced concrete railway sleeper
Assignee: Individual
•
Filing: 1949-12-15
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Granted: 1954-05-11
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Expires: 1969-12-15
Abstract
No abstract record available.
Inventors
- 👤 Mork Sverre Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:01
CPC Classifications
E; E01; E01B; E01B3/00; E01B3/28; E01B3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US738940A
Cited
US1028674A
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US1018902A
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US1050580A
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US1285723A
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US1390203A
Cited
US1527852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |