US3348112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized d. c. motor speed control system
Assignee: Motors Liquidation Co
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Filing: 1964-12-01
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Granted: 1967-10-17
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Expires: 1984-12-01
Abstract
No abstract record available.
Inventors
- 👤 John J Saeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:34
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; Y; Y10; Y10S; Y10S15/00; Y10S15/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A MOTOR SPEED CONTROL SYSTEM INCLUDING, A DIRECT CURRENT ELECTRIC MOTOR HAVING AN ARMATURE CIRCUIT, A SERIES FIELD WINDING AND A SHUNT FIELD WINDING, AN ELECTRIC POWER SOURCE, AN ENERGIZING CIRCUIT FOR SAID MOTOR AND A CONTROL CIRCUIT FOR SAID ENERGIZING CIRCUIT INCLUDING A POTENTIOMETER CONNECTED WITH SAID POWER SOURCE AND SAID ARMATURE CIRCUIT FOR ADJUSTING THE VOLTAGE APPLIED ACROSS SAID ARMATURE CIRCUIT, POWER TRANSISTOR MEANS OPERATING IN THE EMITTER-FOLLOWER MODE CONNECTED IN SAID ARMATURE CIRCUIT AND WITH SAID POTENTIOMETER AND MEANS RESPONSIVE TO CURRENT FLOW THROUGH SAID ARMATURE CIRCUIT FOR CONTROLTO CURRENT FLOW THROUGH SAID ARMATURE CIRCUIT FOR CONTROLLING SAID ARMATURE CIRCUIT VOLTAGE TO REGULATE THE SPEED OF SAID MOTOR UNDER VARYING LOAD CONDITIONS.
Claim 2
Dependent Claim
115 words
A MOTOR SPEED CONTROL SYSTEM INCLUDING, A DIRECT CURRENT ELECTRIC MOTOR HAVING AN ARMATURE CIRCUIT, A SERIES FIELD WINDING AND A SHUNT FIELD WINDING, AN ELECTRIC POWER SOURCE, AN ENERGIZING CIRCUIT FOR SAID MOTOR AND A CONTROL CIRCUIT FOR SAID ENERGIZING CIRCUIT INCLUDING A POTENTIOMETER CONNECTED WITH SAID POWER SOURCE AND SAID ARMATURE CIRCUIT FOR ADJUSTING THE VOLTAGE APPLIED ACROSS SAID ARMATURE CIRCUIT, POWER TRANSISTOR MEANS OPERATING IN THE EMITTER-FOLLOWER MODE CONNECTED IN SAID ARMATURE CIRCUIT AND WITH SAID POTENTIOMETER AND MEANS RESPONSIVE TO CURRENT FLOW THROUGH SAID ARMATURE CIRCUIT FOR CONTROLTO CURRENT FLOW THROUGH SAID ARMATURE CIRCUIT FOR CONTROLLING SAID ARMATURE CIRCUIT VOLTAGE TO REGULATE THE SPEED OF SAID MOTOR UNDER VARYING LOAD CONDITIONS.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |