Patent US5473540A successfully refreshed from Google Patents.
Patent US2952755A successfully refreshed from Google Patents.
US2952755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical relays
Assignee: Westinghouse Air Brake Co
•
Filing: 1957-11-22
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Granted: 1960-09-13
•
Expires: 1977-11-22
Abstract
No abstract record available.
Inventors
- 👤 Emil F Brinker
- 👤 Jr William A Robison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:54
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2720693A
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US2539547A
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US2635155A
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US2790939A
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US2698369A
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US2843696A
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US2767271A
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US2836674A
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US2825784A
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US2855480A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |