US1971818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency and load control of alternating current systems
Assignee: General Electric Co
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Filing: 1931-09-11
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Granted: 1934-08-28
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Expires: 1951-09-11
Abstract
No abstract record available.
Inventors
- 👤 Charles A Hoxie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:13
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/04; H02J3/08; G; G04; G04C; G04C15/00; G04C15/0063; G04C15/0081
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) | 1937-08-27 | 1938-02-26 | 1938-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-08-27 | 1942-02-26 | 1942-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-08-27 | 1946-02-26 | 1946-08-28 | $7700.00 | Window Closed / Lapsed |