US3119957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor control system
Assignee: Individual
•
Filing: 1961-06-16
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Granted: 1964-01-28
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Expires: 1981-06-16
Abstract
No abstract record available.
Inventors
- 👤 Ernst F W Alexanderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
C; C07; C07J; C07J7/00; H; H02; H02P; H02P7/00; H02P7/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A MOTOR CONTROL SYSTEM COMPRISING A REVERSIBLE DIRECT CURRENT MOTOR HAVING ARMATURE AND FIELD WINDINGS, AN ALTERNATING CURRENT INPUT CIRCUIT, RECTIFIER MEANS COMPRISING A PLURALITY OF TRIODES EACH HAVING A CONTROL ELECTRODE CIRCUIT AND INTERCONNECTING SAID MOTOR WINDINGS AND SAID INPUT CIRCUIT FOR ENERGIZING SAID ARMATURE WINDING WITH UNIDIRECTIONAL CURRENT IN ONLY ONE DIRECTION, MEANS CONNECTED TO SAID FIELD WINDING FOR SELECTIVELY REVERSING THE ENERGIZATION THEREOF, RELAY MEANS FOR CONTROLLING SAID LAST MENTIONED MEANS, AN ELECTRIC NETWORK CIRCUIT FOR PROVIDING AN ALTERNATING CONTROL SIGNAL AND TERMINALS THEREFOR, MEANS INTERCONNECTED WITH THE CONTROL ELECTRODE CIRCUIT OF EACH TRIODE AND THE CONTROL SIGNAL TERMINALS FOR CONTROLLING THE TIMING OF FIRING OF SAID TRIODES IN RESPONSE TO THE AMPLITUDE OF SAID CONTROL SIGNAL REGARDLESS OF ITS PHASE, AND MEANS CONNECTED TO BE CONCURRENTLY RESPONSIVE TO SAID CONTROL SIGNAL FOR CONTROLLING SAID RELAY MEANS IN RESPONSE TO THE PHASE OF SAID SIGNAL REGARDLESS OF ITS AMPLITUDE.
Claim 2
Dependent Claim
152 words
A MOTOR CONTROL SYSTEM COMPRISING A REVERSIBLE DIRECT CURRENT MOTOR HAVING ARMATURE AND FIELD WINDINGS, AN ALTERNATING CURRENT INPUT CIRCUIT, RECTIFIER MEANS COMPRISING A PLURALITY OF TRIODES EACH HAVING A CONTROL ELECTRODE CIRCUIT AND INTERCONNECTING SAID MOTOR WINDINGS AND SAID INPUT CIRCUIT FOR ENERGIZING SAID ARMATURE WINDING WITH UNIDIRECTIONAL CURRENT IN ONLY ONE DIRECTION, MEANS CONNECTED TO SAID FIELD WINDING FOR SELECTIVELY REVERSING THE ENERGIZATION THEREOF, RELAY MEANS FOR CONTROLLING SAID LAST MENTIONED MEANS, AN ELECTRIC NETWORK CIRCUIT FOR PROVIDING AN ALTERNATING CONTROL SIGNAL AND TERMINALS THEREFOR, MEANS INTERCONNECTED WITH THE CONTROL ELECTRODE CIRCUIT OF EACH TRIODE AND THE CONTROL SIGNAL TERMINALS FOR CONTROLLING THE TIMING OF FIRING OF SAID TRIODES IN RESPONSE TO THE AMPLITUDE OF SAID CONTROL SIGNAL REGARDLESS OF ITS PHASE, AND MEANS CONNECTED TO BE CONCURRENTLY RESPONSIVE TO SAID CONTROL SIGNAL FOR CONTROLLING SAID RELAY MEANS IN RESPONSE TO THE PHASE OF SAID SIGNAL REGARDLESS OF ITS AMPLITUDE.
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) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |