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Patent US2774012A successfully refreshed from Google Patents.
US2774012A
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Control means for static current converters
Assignee: ABB Norden Holding AB
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Filing: 1953-05-28
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Granted: 1956-12-11
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Expires: 1973-05-28
Abstract
No abstract record available.
Inventors
- 👤 Lamm Uno
- 👤 Uhlmann Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:11
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/15; H02M7/151
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE670533C
Cited
US2310101A
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US2404643A
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US2479242A
Cited
US2600519A
Cited
US2608606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |