Patent US2632878A successfully refreshed from Google Patents.
US2632878A
Expired / Lapsed
US
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Polyphase transformer for current converters
Assignee: ABB Norden Holding AB
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Filing: 1947-08-21
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Granted: 1953-03-24
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Expires: 1967-08-21
Abstract
No abstract record available.
Inventors
- 👤 Uhlmann Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:53
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1876428A
Cited
US1712505A
Cited
GB322107A
Cited
US1783804A
Cited
US2022341A
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US1895370A
Cited
US2009166A
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US2307527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |