US2798997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency regulated power supply
Assignee: North American Aviation Corp
•
Filing: 1953-08-10
•
Granted: 1957-07-09
•
Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:49
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/30; H02P7/305
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2090951A
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US2088495A
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US2273978A
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US2490562A
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US2376421A
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GB570094A
Cited
US2460456A
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US2465110A
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US2476849A
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US2622236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |