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Patent US2659880A successfully refreshed from Google Patents.
US2659880A
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Apparatus for detecting recurrent circuit operation
Assignee: Westinghouse Air Brake Co
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Filing: 1951-12-28
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Granted: 1953-11-17
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Dodd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168; B61L5/00; B61L5/12; B61L5/18; B61L5/1809; B61L5/1881
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) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |