Patent US2740887A successfully refreshed from Google Patents.
US2740887A
Expired / Lapsed
US
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Control apparatus for highway crossing signals
Assignee: Westinghouse Air Brake Co
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Filing: 1951-11-28
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Granted: 1956-04-03
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Expires: 1971-11-28
Abstract
No abstract record available.
Inventors
- 👤 Carl F Lower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:37
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/24; B61L29/28; B61L29/284
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |