US2449396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for influencing the blocking voltage in current converter valves
Assignee: ABB Norden Holding AB
•
Filing: 1945-12-03
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Granted: 1948-09-14
•
Expires: 1965-12-03
Abstract
No abstract record available.
Inventors
- 👤 Lamm Uno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:16
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169818A
Cited
US781603A
Cited
US1251377A
Cited
US1682000A
Cited
US1954028A
Cited
US2125799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |