US2744223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo system, including electrical inverter circuit
Assignee: Elsag Bailey Inc
•
Filing: 1950-11-09
•
Granted: 1956-05-01
•
Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 Jr James F English
- 👤 Anthony J Hornfeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:31
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US543843A
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US2149782A
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GB190022142A
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US1596558A
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US1810539A
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US2364483A
Cited
US2464807A
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US2500953A
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US2512325A
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US2551265A
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US2571915A
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US2620466A
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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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |