Patent US4776853A successfully refreshed from Google Patents.
Patent US3343055A successfully refreshed from Google Patents.
US3343055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable motor speed and torque limit control circuit
Assignee: FINCOR Inc
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Filing: 1965-01-13
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Granted: 1967-09-19
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Expires: 1985-01-13
Abstract
No abstract record available.
Inventors
- 👤 Henry J Havlicek
- 👤 John K Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:34
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/0833; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/901; Y10S388/903; Y10S388/907; Y10S388/917; Y10S388/923; Y10S388/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN A DIRECT CURRENT MOTOR CONTROL CIRCUIT FOR APPLYING DC PULSATING VOLTAGE TO THE ARMATURE THEREOF, THE COMBINATION COMPRISING A FULL WAVE RECTIFIER BRIDGE FOR CONVERTING AC INTO PULSATING DC, A POTENTIOMETER FOR DERIVING AN ADJUSTABLE REFERENCE POTENTIAL LEVEL FROM THE DC FOR SPEED CONTROL, AN SCR RESPONSIVE O THE DC FOR APPLYING AT LEAST A PORTION THEREOF TO THE ARMATURE OF THE MOTOR, A MAGNETIC AMPLIFIER INCLUDING A CONTROLLED WINDING RESPONSIVE TO THE ADJUSTABLE REFERENCE POTENTIAL LEVEL TO GATE THE SCR AT SELECTABLE TIMES DURING THE DC PULSATIONS TO DETERMINE SAID PORTION OF DC APPLIED TO THE ARMATURE, A LOW PASS FILTER IN PARALLEL WITH THE ARMATURE AND RESPONSIVE TO THE PORTION OF DC TO MODIFY THE ADJUSTABLE REFERENCE
Claim 2
Dependent Claim
120 words
IN A DIRECT CURRENT MOTOR CONTROL CIRCUIT FOR APPLYING DC PULSATING VOLTAGE TO THE ARMATURE THEREOF, THE COMBINATION COMPRISING A FULL WAVE RECTIFIER BRIDGE FOR CONVERTING AC INTO PULSATING DC, A POTENTIOMETER FOR DERIVING AN ADJUSTABLE REFERENCE POTENTIAL LEVEL FROM THE DC FOR SPEED CONTROL, AN SCR RESPONSIVE O THE DC FOR APPLYING AT LEAST A PORTION THEREOF TO THE ARMATURE OF THE MOTOR, A MAGNETIC AMPLIFIER INCLUDING A CONTROLLED WINDING RESPONSIVE TO THE ADJUSTABLE REFERENCE POTENTIAL LEVEL TO GATE THE SCR AT SELECTABLE TIMES DURING THE DC PULSATIONS TO DETERMINE SAID PORTION OF DC APPLIED TO THE ARMATURE, A LOW PASS FILTER IN PARALLEL WITH THE ARMATURE AND RESPONSIVE TO THE PORTION OF DC TO MODIFY THE ADJUSTABLE REFERENCE
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |