Patent US3217223A successfully refreshed from Google Patents.
US3217223A
Expired / Lapsed
US
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Motor control system
Assignee: Unisys Corp
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Filing: 1960-06-17
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Granted: 1965-11-09
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Expires: 1980-06-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles F Chubb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:19
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A CONTROL DEVICE FOR A MOTOR HAVING SEPARATELY EXCITED FIELD AND ARMATURE WINDINGS, SAID DEVICE COMPRISING FIRST AND SECOND MEANS FOR SUPPLYING A STEADY DIRECT CURRENT TO EXCITE SAID ARMATURE AND FIELD WINDINGS RESPECTIVELY IN RESPONSE TO A GIVEN APPLIED CONTROL SIGNAL, MEANS FOR SIMULTANEOUSLY APPLYING ALL INPUT CONTROL SIGNALS TO EACH OF SAID FIRST AND SECOND MEANS, MEANS
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |