Patent US4452387A successfully refreshed from Google Patents.
Patent US2869050A successfully refreshed from Google Patents.
US2869050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic circuits
Assignee: —
•
Filing: 1956-06-20
•
Granted: 1959-01-13
•
Expires: 1976-06-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:31
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/14; H01F29/146; H01F3/00; H01F3/10; H01F2003/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
US2375017A
Cited
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Cited
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Cited
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Cited
US2774935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |