Patent US2651713A successfully refreshed from Google Patents.
US2651713A
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US
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Means for supplying railway cab signaling energy through short railway track circuits
Assignee: Westinghouse Air Brake Co
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Filing: 1948-07-02
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Granted: 1953-09-08
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Expires: 1968-07-02
Abstract
No abstract record available.
Inventors
- 👤 Frank B Florencourt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:07
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US329076A
Cited
US1686036A
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US2105930A
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US2097843A
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US2391985A
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US2514454A
Cited
US2584566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |