Patent US2833885A successfully refreshed from Google Patents.
US2833885A
Expired / Lapsed
US
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Electrical relays
Assignee: Westinghouse Air Brake Co
•
Filing: 1954-10-25
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Granted: 1958-05-06
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Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Wesley B Wells
- 👤 Russell M Adkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:01
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/64; H01H50/645; H01H50/54; H01H50/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US329399A
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US1766611A
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US2273545A
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US2258122A
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US2335110A
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US2347834A
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US2490280A
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US2638514A
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US2619569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |