Patent US2431487A successfully refreshed from Google Patents.
Patent US3262040A successfully refreshed from Google Patents.
US3262040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system for centrifuge motors and the like
Assignee: IVAN SORVALL Inc
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Filing: 1963-09-23
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Granted: 1966-07-19
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Expires: 1983-09-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Jackson
- 👤 James P Fay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:07
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; H02P25/145; H02P1/00; H02P1/16; H02P1/166; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/2855; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A MOTOR CONTROL SYSTEM COMPRISING A SERIES BRUSH COMMUTATED MOTOR, A SATURABLE REACTOR HAVING A SATURATION CONTROL WINDING, A FIRST SOURCE OF ALTERNATING CURRENT, MEANS TO IMPRESS SAID FIRST SOURCE OF ALTERNATING CURRENT ON SAID MOTOR AND SAID REACTOR IN SERIES RELATION, A SPEED SENSING ALTERNATING VOLTAGE GENERATOR COUPLED TO SAID MOTOR, RECTIFYING MEANS TO CONVERT THE OUTPUT OF SAID GENERATOR INTO A DIRECT POTENTIAL APPROXMIATELY PROPORTIONAL TO THE SPEED OF SAID MOTOR, AN ADJUSTABLE SOURCE OF DIRECT CURRENT SPEED CONTROLLING REFERENCE POTENTIAL, A GRID CONTROLLED GAS DISCHARGE TUBE HAVING A PLATE, A GRID, AND A CATHODE, A SECOND OF ALTERNATING CURRENT, FIRST CIRCUIT MEANS CONNECTING SAID GAS DISCHARGE TUBE, SAID REACTOR CONTROL WINDING AND SAID SECOND ALTERNATING CURRENT SOURCE IS SERIES RELATION, AND SECOND CIRCUIT MEANS FOR APPLYING A POTENTIAL WHICH IS FUNCTION OF THE DIFFERENCE BETWEEN SAID SPEED PROPORTIONAL POTENTIAL AND SAID REFERENCE POTENTIAL TO THE CONTROL GRID OF SAID GRID CONTROLLED GAS DISCHARGE TUBE, SAID ADJUSTABLE REFERENCE
Claim 2
Dependent Claim
160 words
A MOTOR CONTROL SYSTEM COMPRISING A SERIES BRUSH COMMUTATED MOTOR, A SATURABLE REACTOR HAVING A SATURATION CONTROL WINDING, A FIRST SOURCE OF ALTERNATING CURRENT, MEANS TO IMPRESS SAID FIRST SOURCE OF ALTERNATING CURRENT ON SAID MOTOR AND SAID REACTOR IN SERIES RELATION, A SPEED SENSING ALTERNATING VOLTAGE GENERATOR COUPLED TO SAID MOTOR, RECTIFYING MEANS TO CONVERT THE OUTPUT OF SAID GENERATOR INTO A DIRECT POTENTIAL APPROXMIATELY PROPORTIONAL TO THE SPEED OF SAID MOTOR, AN ADJUSTABLE SOURCE OF DIRECT CURRENT SPEED CONTROLLING REFERENCE POTENTIAL, A GRID CONTROLLED GAS DISCHARGE TUBE HAVING A PLATE, A GRID, AND A CATHODE, A SECOND OF ALTERNATING CURRENT, FIRST CIRCUIT MEANS CONNECTING SAID GAS DISCHARGE TUBE, SAID REACTOR CONTROL WINDING AND SAID SECOND ALTERNATING CURRENT SOURCE IS SERIES RELATION, AND SECOND CIRCUIT MEANS FOR APPLYING A POTENTIAL WHICH IS FUNCTION OF THE DIFFERENCE BETWEEN SAID SPEED PROPORTIONAL POTENTIAL AND SAID REFERENCE POTENTIAL TO THE CONTROL GRID OF SAID GRID CONTROLLED GAS DISCHARGE TUBE, SAID ADJUSTABLE REFERENCE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |