Patent US2998515A successfully refreshed from Google Patents.
US2998515A
Expired / Lapsed
US
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Speed control system
Assignee: Westinghouse Air Brake Co
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Filing: 1958-02-28
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Granted: 1961-08-29
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Expires: 1978-02-28
Abstract
No abstract record available.
Inventors
- 👤 Richard D Campbell
- 👤 Joseph M Berill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:21
CPC Classifications
B; B61; B61L; B61L17/00; B61L17/02; B61L17/023
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |