Patent US2551831A successfully refreshed from Google Patents.
US2551831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway signal
Assignee: Individual
•
Filing: 1946-05-24
•
Granted: 1951-05-08
•
Expires: 1966-05-24
Abstract
No abstract record available.
Inventors
- 👤 Carson D Eaves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:47
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US800031A
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US848253A
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US1666862A
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US1665374A
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US1775725A
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US1944498A
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US2221290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |