Patent US3424971A successfully refreshed from Google Patents.
US3424971A
Expired / Lapsed
US
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Means for controlling reactive power in an inverter station
Assignee: ABB Norden Holding AB
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Filing: 1967-04-26
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Granted: 1969-01-28
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Expires: 1987-04-26
Abstract
No abstract record available.
Inventors
- 👤 Hans Stackegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/51; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1828; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3249844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |