Patent US3512074A successfully refreshed from Google Patents.
US3512074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generator having two field windings and control system therefor
Assignee: Central Electricity Generating Board
•
Filing: 1969-01-29
•
Granted: 1970-05-12
•
Expires: 1989-01-29
Abstract
No abstract record available.
Inventors
- 👤 John Alexander Soper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1885; H02K; H02K19/00; H02K19/16; H02K19/26; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2796580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |