US3384810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer circuit with direct current flux cancellation
Assignee: Nortel Networks Ltd
•
Filing: 1964-03-04
•
Granted: 1968-05-21
•
Expires: 1984-03-04
Abstract
No abstract record available.
Inventors
- 👤 Ernest S Kelsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:35
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/50; H01; H01F; H01F38/00; H01F38/02; H01F38/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2207392A
Cited
US3078396A
Cited
US3221244A
Cited
US3136948A
Cited
US3142011A
Cited
US3229184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |