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Patent US1719892A successfully refreshed from Google Patents.
US1719892A
Expired / Lapsed
US
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Transformer for feeding polyphase rectifiers
Assignee: BBC Brown Boveri AG Germany
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Filing: 1922-02-02
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Granted: 1929-07-09
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Expires: 1942-02-02
Abstract
No abstract record available.
Inventors
- 👤 Kubler Johann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:49
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/068; H01; H01F; H01F27/00; H01F27/34; H01F30/00; H01F30/06; H01F30/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1932-07-08 | 1933-01-07 | 1933-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-07-08 | 1937-01-07 | 1937-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-07-08 | 1941-01-07 | 1941-07-09 | $7700.00 | Window Closed / Lapsed |