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Patent US3448286A successfully refreshed from Google Patents.
US3448286A
Expired / Lapsed
US
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Balancing of harmonics at converter stations in asymmetrical working
Assignee: ABB Norden Holding AB
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Filing: 1964-10-22
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Granted: 1969-06-03
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Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Hans A Stackegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:00
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/36; H02M; H02M1/00; H02M1/12; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/068; Y; Y02; Y02E; Y02E60/00; Y02E60/60
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) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |