US2764888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precast sleeper construction
Assignee: Individual
•
Filing: 1953-01-15
•
Granted: 1956-10-02
•
Expires: 1973-01-15
Abstract
No abstract record available.
Inventors
- 👤 Olson Clarence Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:40
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/16; E04B5/32; E04B5/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1163060A
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US1302452A
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US1651072A
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US1820041A
Cited
US1917930A
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US2092694A
Cited
US2301187A
Cited
GB646878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |