Patent US4120594A successfully refreshed from Google Patents.
US2805301A
Expired / Lapsed
US
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Electrical relays
Assignee: Westinghouse Air Brake Co
•
Filing: 1953-07-24
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Granted: 1957-09-03
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Expires: 1973-07-24
Abstract
No abstract record available.
Inventors
- 👤 Noble C Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:04
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/26; H01H35/30; H01H50/00; H01H50/16; H01H50/18; H01H50/30; H01H50/305; H01H50/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1009476A
Cited
GB158994A
Cited
US2115836A
Cited
US2140604A
Cited
US2182715A
Cited
US2243566A
Cited
US2248584A
Cited
FR860463A
Cited
US2256653A
Cited
US2334514A
Cited
DE729979C
Cited
CH246539A
Cited
US2490280A
Cited
US2494308A
Cited
US2590996A
Cited
US2611050A
Cited
US2540854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |