US2820943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Minimum time delay magnetic amplifier
Assignee: North American Aviation Corp
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Filing: 1952-10-14
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Granted: 1958-01-21
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Expires: 1972-10-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Keith L Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/016; H; H03; H03F; H03F9/00; H03F9/04
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |