Patent US2854567A successfully refreshed from Google Patents.
US2854567A
Expired / Lapsed
US
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Railway traffic controlling apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1954-04-23
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Granted: 1958-09-30
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Expires: 1974-04-23
Abstract
No abstract record available.
Inventors
- 👤 Crawford E Staples
- 👤 Charles B Shields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:29
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1662444A
Cited
US1770705A
Cited
US2018241A
Cited
US2098833A
Cited
US2243725A
Cited
US2617921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |