US2990508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous alternator system
Assignee: Fidelity Electric Co Inc
•
Filing: 1956-12-10
•
Granted: 1961-06-27
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Louis W Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:38
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/08; H02K; H02K19/00; H02K19/16; H02K19/26; H02K19/30
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |