US2457568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for plural motor propulsion systems
Assignee: Westinghouse Air Brake Co
•
Filing: 1943-08-31
•
Granted: 1948-12-28
•
Expires: 1963-08-31
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:17
CPC Classifications
B; B63; B63H; B63H21/00; B63H21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1321935A
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US1173415A
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US1682358A
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GB285287A
Cited
GB324780A
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US2096251A
Cited
US2199426A
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US2288173A
Cited
US2289654A
Cited
US2324571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |