US3374758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon controlled rectifier circuit arrangement for sewing machine drives
Assignee: Singer Co
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Filing: 1965-05-26
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Granted: 1968-03-26
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Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 James W Mais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:16
CPC Classifications
G; G07; G07C; G07C5/00; G07C5/08; G07C5/12; D; D05; D05B; D05B69/00; D05B69/14; D05B69/18; G01; G01P; G01P1/00; G01P1/12; G01P1/122; G01P1/125; H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/295; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN COMBINATION, A SEWING MACHINE, AN ELECTRIC MOTOR DRIVING SAID SEWING MACHINE, A CONTROLLER POSITIONED EXTERNALLY OF SAID SEWING MACHINE, A PLURALITY OF ELECTRICAL CIRCUIT ELEMENTS MOUNTED IN SAID CONTROLLER, DETACHABLE MEANS FOR ELECTRICALLY CONNECTING SAID CIRCUIT ELEMENTS TO SAID MOTOR AND TO A SOURCE OF VOLTAGE, SAID ELEMENTS INCLUDING A SILICON CONTROLLED RECTIFIER HAVING CONTROL TERMINALS, AN OPERATOR-ADJUSTABLE MEANS CONTROLLING THE FIRING VOLTAGE FOR SAID RECTIFIER TO CONTROL THE MOTOR SPEED OVER A DESIRED RANGE OF SPEEDS AND A THREE-TERMINAL PRE-SET TRIM POTENTIOMETER HAVING TWO OF ITS TERMINALS CONNECTED DIRECTLY TO THE RESPECTIVE CONTROL TERMINALS OF SAID RECTIFIER TO FORM A VOLTAGE DIVIDER FOR APPLYING A PRE-SET PORTION OF SAID FIRING VOLTAGE TO THE CONTROL
Claim 2
Dependent Claim
116 words
IN COMBINATION, A SEWING MACHINE, AN ELECTRIC MOTOR DRIVING SAID SEWING MACHINE, A CONTROLLER POSITIONED EXTERNALLY OF SAID SEWING MACHINE, A PLURALITY OF ELECTRICAL CIRCUIT ELEMENTS MOUNTED IN SAID CONTROLLER, DETACHABLE MEANS FOR ELECTRICALLY CONNECTING SAID CIRCUIT ELEMENTS TO SAID MOTOR AND TO A SOURCE OF VOLTAGE, SAID ELEMENTS INCLUDING A SILICON CONTROLLED RECTIFIER HAVING CONTROL TERMINALS, AN OPERATOR-ADJUSTABLE MEANS CONTROLLING THE FIRING VOLTAGE FOR SAID RECTIFIER TO CONTROL THE MOTOR SPEED OVER A DESIRED RANGE OF SPEEDS AND A THREE-TERMINAL PRE-SET TRIM POTENTIOMETER HAVING TWO OF ITS TERMINALS CONNECTED DIRECTLY TO THE RESPECTIVE CONTROL TERMINALS OF SAID RECTIFIER TO FORM A VOLTAGE DIVIDER FOR APPLYING A PRE-SET PORTION OF SAID FIRING VOLTAGE TO THE CONTROL
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) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |