US2678411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impulse operated relay circuits
Assignee: Westinghouse Air Brake Co
•
Filing: 1951-07-27
•
Granted: 1954-05-11
•
Expires: 1971-07-27
Abstract
No abstract record available.
Inventors
- 👤 Hufnagel Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:50
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2206578A
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US2256347A
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US2279849A
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US2367742A
Cited
US2378325A
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US2515480A
Cited
US2515868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |