Patent US2827531A successfully refreshed from Google Patents.
US2827531A
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US
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Magnetically operated switch
Assignee: North American Aviation Corp
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Filing: 1955-05-31
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Granted: 1958-03-18
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Elwin J O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:18
CPC Classifications
H; H01; H01H; H01H36/00; H01H36/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB538409A
Cited
GB124041A
Cited
DE628014C
Cited
DE699682C
Cited
US2543014A
Cited
US2575086A
Cited
US2560814A
Cited
US2548581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |