Patent US2259711A successfully refreshed from Google Patents.
US2259711A
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Alternating electric current control apparatus
Assignee: Hitachi Rail STS USA Inc
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Filing: 1940-12-04
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Granted: 1941-10-21
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Expires: 1960-12-04
Abstract
No abstract record available.
Inventors
- 👤 Stevens Sydney Arthur
- 👤 Walker Alec Hervey Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/08; C07D295/084; C07D295/088; G; G05; G05B; G05B11/00; G05B11/01; G05B11/012; G05B11/016; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; H; H03; H03F; H03F9/00; H03F9/02
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) | 1944-10-20 | 1945-04-21 | 1945-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-10-20 | 1949-04-21 | 1949-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-10-20 | 1953-04-21 | 1953-10-21 | $7700.00 | Window Closed / Lapsed |