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US2887570A
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Railway track circuit-signalling system
Assignee: Individual
•
Filing: 1955-08-25
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Granted: 1959-05-19
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Expires: 1975-08-25
Abstract
No abstract record available.
Inventors
- 👤 Leroy Emile Marcel Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:55
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/18; B61L1/181; B61L1/188; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2393135A
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US2541879A
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US2424319A
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US2480160A
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US2554006A
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US2554460A
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US2515868A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |