Patent US2934637A successfully refreshed from Google Patents.
US2934637A
Expired / Lapsed
US
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Cab signaling system for railroads
Assignee: SPX Technologies Inc
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Filing: 1956-08-23
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Granted: 1960-04-26
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Expires: 1976-08-23
Abstract
No abstract record available.
Inventors
- 👤 Clinton S Wilcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:46
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221; B61L2003/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2045992A
Cited
US2326622A
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US2731551A
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US2761916A
Cited
US2751446A
Cited
US2762464A
Cited
US2773945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |