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US3089992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision frequency control
Assignee: EIDP Inc
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Filing: 1960-05-09
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Granted: 1963-05-14
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Expires: 1980-05-09
Abstract
No abstract record available.
Inventors
- 👤 Seney John Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:16
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
AN IMPROVED SYSTEM FOR OPERATING AND PRECISELY CONTROLLING THE SPEED OF A SYNCHRONOUS MOTOR, COMPRISING A FIRST SOURCE OF UNREGULATED FREQUENCY HIGH ENERGY ALTERNATING CURRENT, RECTIFYING MEANS CONNECTED TO SAID SOURCE FOR CONVERTING SAID CURRENT TO A CONTINUOUS SERIES OF FINITE DIRECT CURRENT PULSES, ELECTRONIC VALVE MEANS, HAVING INPUT AND OUTPUT TERMINALS CONNECTED IN SERIES WITH SAID RECTIFYING MEANS AND A SYNCHRONOUS ELECTRIC MOTOR, SAID ELECTRONIC VALVE MEANS HAVING A CONTROL ELECTRODE, A SECOND SOURCE OF LOW ENERGY ALTERNATING CURRENT, HAVING A PRECISELY CONTROLLED FREQUENCY, CONNECTED TO SAID CONTROL ELECTRODE, SAID PRECISELY CONTROLLED FREQUENCY LESS THAN SAID FREQUENCY AVERAGE OF THE CURRENT PROVIDED BY SAID FIRST SOURCE BY A FACTOR OF AT LEAST 4 TO 1, SAID VALVE MEANS OPERATING UNDER CONTROL OF SAID PRECISELY CONTROLLED LOW ENERGY ALTERNATING CURRENT TO SUPPLY SAID MOTOR DIRECTLY WITH A SERIES OF PRECISELY TIMED GROUPS OF CLOSELY SPACED FINITE DIRECT CURRENT PULSES TO DRIVE AND PRECISELY CONTROL THE SPEED OF THE MOTOR.
Claim 2
Dependent Claim
159 words
AN IMPROVED SYSTEM FOR OPERATING AND PRECISELY CONTROLLING THE SPEED OF A SYNCHRONOUS MOTOR, COMPRISING A FIRST SOURCE OF UNREGULATED FREQUENCY HIGH ENERGY ALTERNATING CURRENT, RECTIFYING MEANS CONNECTED TO SAID SOURCE FOR CONVERTING SAID CURRENT TO A CONTINUOUS SERIES OF FINITE DIRECT CURRENT PULSES, ELECTRONIC VALVE MEANS, HAVING INPUT AND OUTPUT TERMINALS CONNECTED IN SERIES WITH SAID RECTIFYING MEANS AND A SYNCHRONOUS ELECTRIC MOTOR, SAID ELECTRONIC VALVE MEANS HAVING A CONTROL ELECTRODE, A SECOND SOURCE OF LOW ENERGY ALTERNATING CURRENT, HAVING A PRECISELY CONTROLLED FREQUENCY, CONNECTED TO SAID CONTROL ELECTRODE, SAID PRECISELY CONTROLLED FREQUENCY LESS THAN SAID FREQUENCY AVERAGE OF THE CURRENT PROVIDED BY SAID FIRST SOURCE BY A FACTOR OF AT LEAST 4 TO 1, SAID VALVE MEANS OPERATING UNDER CONTROL OF SAID PRECISELY CONTROLLED LOW ENERGY ALTERNATING CURRENT TO SUPPLY SAID MOTOR DIRECTLY WITH A SERIES OF PRECISELY TIMED GROUPS OF CLOSELY SPACED FINITE DIRECT CURRENT PULSES TO DRIVE AND PRECISELY CONTROL THE SPEED OF THE MOTOR.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |