Patent US3130361A successfully refreshed from Google Patents.
US2843818A
Expired / Lapsed
US
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Magnetic amplifier
Assignee: North American Aviation Corp
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Filing: 1953-04-13
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Granted: 1958-07-15
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Mintz Martin
- 👤 Gerald D Shere
- 👤 Malcolm F Thompson
- 👤 John J Wittkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:00
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |