Patent US2714697A successfully refreshed from Google Patents.
US2714697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-phase, rc, variable voltage, variable frequency oscillator for electric motor
Assignee: Individual
•
Filing: 1953-04-02
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Granted: 1955-08-02
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Expires: 1973-04-02
Abstract
No abstract record available.
Inventors
- 👤 Donald C Small
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; H; H02; H02P; H02P27/00; H02P27/04; H02P27/048; H02P2207/00; H02P2207/01; H02P27/047
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) | 1958-08-01 | 1959-01-31 | 1959-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-01 | 1963-01-31 | 1963-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-01 | 1967-01-31 | 1967-08-02 | $7700.00 | Window Closed / Lapsed |