US3177387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous electric frequency converter
Assignee: Individual
•
Filing: 1961-08-30
•
Granted: 1965-04-06
•
Expires: 1981-08-30
Abstract
No abstract record available.
Inventors
- 👤 Leischner Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:27
CPC Classifications
H; H02; H02K; H02K47/00; H02K47/18; H02K47/22; H02K47/24; F; F22; F22B; F22B17/00; F22B17/10; F22B17/12; H02K19/00; H02K19/16; H02K19/38; H02K99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2722652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |