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Patent US2968758A successfully refreshed from Google Patents.
US2968758A
Expired / Lapsed
US
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Low frequency electrical generators
Assignee: British Thomson Houston Co Ltd
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Filing: 1958-03-25
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Granted: 1961-01-17
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Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Ludbrook Leslie Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:03
CPC Classifications
H; H02; H02M; H02M5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1992625A
Cited
US2501543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |