US2682633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter frequency regulator
Assignee: North American Aviation Corp
•
Filing: 1952-04-05
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Granted: 1954-06-29
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Expires: 1972-04-05
Abstract
No abstract record available.
Inventors
- 👤 Hugo H Woerdemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:41
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/42; H02P2101/00; H02P2101/30; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/913; Y10S388/922
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) | 1957-06-28 | 1957-12-28 | 1958-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-28 | 1961-12-28 | 1962-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-28 | 1965-12-28 | 1966-06-29 | $7700.00 | Window Closed / Lapsed |