US2823327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction-type synchronous motor with lifelong permanent magnet rotor
Assignee: E INGRAHAM Co
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Filing: 1955-07-22
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Granted: 1958-02-11
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Expires: 1975-07-22
Abstract
No abstract record available.
Inventors
- 👤 Kohlhagen Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:52
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/20
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |