US3524069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the current of the electric traction motors of an a.c. thermal-electric drive
Assignee: GRENX HOLDING
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Filing: 1967-02-28
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Granted: 1970-08-11
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Expires: 1987-02-28
Abstract
No abstract record available.
Inventors
- 👤 Alexandr Dmitrievich Stepanov
- 👤 Vitaly Ivanovich Anders
- 👤 Anatoly Vladimirov Prokopovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:43
CPC Classifications
B; B60; B60L; B60L50/00; B60L50/10; B60L50/13; B60L2200/00; B60L2200/26; B60L2220/00; B60L2220/10; B60L2220/14; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |