Patent US3309596A successfully refreshed from Google Patents.
US3309596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for regulating the speed of miniature electric d.-c.-motors
Assignee: Individual
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Filing: 1965-11-17
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Granted: 1967-03-14
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Expires: 1985-11-17
Abstract
No abstract record available.
Inventors
- 👤 Limley Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:31
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/913; Y10S388/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
ARRANGEMENT FOR MAINTAINING CONSTANT THE NUMBER OF REVOLUTIONS OF A CONSTANTLY ENERIZED DIRECT CURRENT SHUNT MOTOR DESPITE OCCURRING CHANGES OF THE DIRECT CURRENT SUPPLY VOLTAGE AND OF THE LOAD COMPRISING A FIRST TRANSISTOR, THE COLLECTOR-EMITTER DISTANCE OF WHICH IS CONNECTED IN SERIES WITHIN THE ARMATURE CIRCUIT OF SAID MOTOR, A SECOND TRANSISTOR, THE COLLECTOR ELECTRODE OF WHICH IS COUPLED TO THE BASE ELECTRODE OF SAID FIRST TRANSISTOR, CIRCUIT MEANS FOR DERIVING A DIRECT CURRENT VOLTAGE AND FOR FEEDING SAID CONTROL VOLTAGE TO THE BASE AND EMITTER ELECTRODES OF SAID SECOND TRANSISTOR, SAID CONTROL VOLTAGE BEING THE SUM OF A CONSTANT DIRECT CURRENT VOLTAGE AND A VOLTAGE PROPORTIONAL TO THE ARMATURE DIRECT CURRENT MINUS A VOLTAGE WHICH IS PROPORTIONAL TO THE ARMATURE DIRECT CURRENT VOLTAGE.
Claim 2
Dependent Claim
124 words
ARRANGEMENT FOR MAINTAINING CONSTANT THE NUMBER OF REVOLUTIONS OF A CONSTANTLY ENERIZED DIRECT CURRENT SHUNT MOTOR DESPITE OCCURRING CHANGES OF THE DIRECT CURRENT SUPPLY VOLTAGE AND OF THE LOAD COMPRISING A FIRST TRANSISTOR, THE COLLECTOR-EMITTER DISTANCE OF WHICH IS CONNECTED IN SERIES WITHIN THE ARMATURE CIRCUIT OF SAID MOTOR, A SECOND TRANSISTOR, THE COLLECTOR ELECTRODE OF WHICH IS COUPLED TO THE BASE ELECTRODE OF SAID FIRST TRANSISTOR, CIRCUIT MEANS FOR DERIVING A DIRECT CURRENT VOLTAGE AND FOR FEEDING SAID CONTROL VOLTAGE TO THE BASE AND EMITTER ELECTRODES OF SAID SECOND TRANSISTOR, SAID CONTROL VOLTAGE BEING THE SUM OF A CONSTANT DIRECT CURRENT VOLTAGE AND A VOLTAGE PROPORTIONAL TO THE ARMATURE DIRECT CURRENT MINUS A VOLTAGE WHICH IS PROPORTIONAL TO THE ARMATURE DIRECT CURRENT VOLTAGE.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |