US3173041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for electromagnetic couplings
Assignee: Pye Electronic Products Ltd
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Filing: 1960-01-15
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Granted: 1965-03-09
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Expires: 1980-01-15
Abstract
No abstract record available.
Inventors
- 👤 Norman R Bancroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:17
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/0016; H02P29/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A SPEED CONTROL CIRCUIT FOR AN ELECTROMAGNETIC COUPLING DEVICE, COMPRISING AN ALTERNATING CURRENT FEEDBACK GENERATOR DRIVEN FROM THE OUTPUT SHAFT OF THE COUPLING DEVICE AND WHICH PRODUCES AN OUTPUT VARYING AS A FUNCTION OF THE OUTPUT SHAFT SPEED, MEANS FOR APPLYING THE OUTPUT OF SAID FEEDBACK GENERATOR TO A CONTROL CIRCUIT TO MAINTAIN A DESIRED SPEED OF ROTATION OF SAID COUPLING, SAID CONTROL CIRCUIT INCLUDING A TRANSISTOR, A POTENTIOMETER FED WITH A DIRECT CURRENT VOLTAGE, MEANS FOR SETTING AN ADJUSTABLE TAPPING ON SAID POTENTIOMETER TO A VALUE REPRESENTING THE DESIRED SPEED OF ROTATION OF SAID COUPLING, MEANS FOR APPLYING THE VOLTAGE DERIVED FROM THE ADJUSTABLE TAPPING AS A POTENTIAL TO THE BASE OF SAID TRANSISTOR, MEANS FOR RECTIFYING THE OUTPUT FROM SAID FEEDBACK GENERATOR AND APPLYING THE RECTIFIED VOLTAGE TO THE BASE OF SAID TRANSISTOR, A FULL WAVE THYRATRON RECTIFIER CIRCUIT COMPRISING TWO THYRATRON TUBES, MEANS FOR FEEDING AN ALTERNATING CURRENT POTENTIAL TO THE ANODES OF SAID THYRATRON TUBES, MEANS FOR BIASING THE CONTROL GRIDS OF THE THYRATRON TUBES SO THAT THEY CONDUIT DURING THE POSITIVE HALF-CYCLES OF ANODE VOLTAGE EXCURSION, MEANS FOR APPLYING A DIRECT CURRENT VOLTAGE DEPENDING UPON THE CONDUCTANCE OF SAID TRANSISTOR AS A FURTHER BIAS TO THE CON-
Claim 2
Dependent Claim
202 words
A SPEED CONTROL CIRCUIT FOR AN ELECTROMAGNETIC COUPLING DEVICE, COMPRISING AN ALTERNATING CURRENT FEEDBACK GENERATOR DRIVEN FROM THE OUTPUT SHAFT OF THE COUPLING DEVICE AND WHICH PRODUCES AN OUTPUT VARYING AS A FUNCTION OF THE OUTPUT SHAFT SPEED, MEANS FOR APPLYING THE OUTPUT OF SAID FEEDBACK GENERATOR TO A CONTROL CIRCUIT TO MAINTAIN A DESIRED SPEED OF ROTATION OF SAID COUPLING, SAID CONTROL CIRCUIT INCLUDING A TRANSISTOR, A POTENTIOMETER FED WITH A DIRECT CURRENT VOLTAGE, MEANS FOR SETTING AN ADJUSTABLE TAPPING ON SAID POTENTIOMETER TO A VALUE REPRESENTING THE DESIRED SPEED OF ROTATION OF SAID COUPLING, MEANS FOR APPLYING THE VOLTAGE DERIVED FROM THE ADJUSTABLE TAPPING AS A POTENTIAL TO THE BASE OF SAID TRANSISTOR, MEANS FOR RECTIFYING THE OUTPUT FROM SAID FEEDBACK GENERATOR AND APPLYING THE RECTIFIED VOLTAGE TO THE BASE OF SAID TRANSISTOR, A FULL WAVE THYRATRON RECTIFIER CIRCUIT COMPRISING TWO THYRATRON TUBES, MEANS FOR FEEDING AN ALTERNATING CURRENT POTENTIAL TO THE ANODES OF SAID THYRATRON TUBES, MEANS FOR BIASING THE CONTROL GRIDS OF THE THYRATRON TUBES SO THAT THEY CONDUIT DURING THE POSITIVE HALF-CYCLES OF ANODE VOLTAGE EXCURSION, MEANS FOR APPLYING A DIRECT CURRENT VOLTAGE DEPENDING UPON THE CONDUCTANCE OF SAID TRANSISTOR AS A FURTHER BIAS TO THE CON-
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |