US2722652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excitation system for electrical machines
Assignee: Keefe & Merritt Co O
•
Filing: 1950-04-27
•
Granted: 1955-11-01
•
Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 Maurice W Brainard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/04; H02K11/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2377930A
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US2478749A
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US2414287A
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US2486110A
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US2482875A
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US2525495A
Cited
US2497141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |