Patent US3153754A successfully refreshed from Google Patents.
US3153754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servomechanism employing a shaded pole motor
Assignee: Penn Controls Inc
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Filing: 1961-10-09
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Granted: 1964-10-20
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Expires: 1981-10-09
Abstract
No abstract record available.
Inventors
- 👤 Lyell J Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:00
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
211 words
A CONTROL CIRCUIT FOR A SHADED POLE MOTOR, HAVING A MAIN FIELD WINDING ADAPTED TO BE CONNECTED TO A MEANS FOR PRODUCING AN ALTERNATING CURRENT, A FIRST SHADING WINDING AND A SECOND SHADING WINDING COMPRISING A MEANS FOR PRODUCING AN ALTERNATING CONTROL SIGNAL ADAPTED TO BE CONNECTED TO THE MEANS FOR PRODUCING AN ALTERNATING CURRENT AND A SWITCHING MEANS WHICH CLOSES A FIRST CIRCUIT THROUGH SAID FIRST WINDING TO PERMIT CURRENT TO FLOW THERETHROUGH DURING A POSITIVE HALF CYCLE OF SAID ALTERNATING CURRENT AND CLOSES A SECOND CIRCUIT THROUGH SAID FIRST WINDING TO PERMIT CURRENT FLOW THERETHROUGH DURING A NEGATIVE HALF CYCLE OF SAID ALTERNATING CURRENT WHENEVER SAID CONTROL SIGNAL IS IN PHASE WITH SAID ALTERNATING CURRENT AND WHICH CLOSES A FIRST CIRCUIT THROUGH SAID SECOND WINDING TO PERMIT CURRENT FLOW THERETHROUGH DURING A POSITIVE HALF CYCLE OF SAID ALTERNATING CURRENT AND CLOSES A SECOND CIRCUIT THROUGH SAID SECOND WINDING TO PERMIT CURRENT FLOW THERETHROUGH DURING A NEGATIVE HALF CYCLE OF SAID ALTERNATING CURRENT WHENEVER SAID CONTROL SIGNAL IS OUT OF PHASE WITH SAID ALTERNATING CURRENT, SAID CIRCUITS THROUGH SAID FIRST WINDING BEING OPEN WHENEVER A CIRCUIT THROUGH SAID SECOND WINDING IS CLOSED AND SAID CIRCUITS THROUGH SAID SECOND WINDING BEING OPEN WHENEVER A CIRCUIT THROUGH SAID FIRST WINDING IS CLOSED.
Claim 2
Dependent Claim
211 words
A CONTROL CIRCUIT FOR A SHADED POLE MOTOR, HAVING A MAIN FIELD WINDING ADAPTED TO BE CONNECTED TO A MEANS FOR PRODUCING AN ALTERNATING CURRENT, A FIRST SHADING WINDING AND A SECOND SHADING WINDING COMPRISING A MEANS FOR PRODUCING AN ALTERNATING CONTROL SIGNAL ADAPTED TO BE CONNECTED TO THE MEANS FOR PRODUCING AN ALTERNATING CURRENT AND A SWITCHING MEANS WHICH CLOSES A FIRST CIRCUIT THROUGH SAID FIRST WINDING TO PERMIT CURRENT TO FLOW THERETHROUGH DURING A POSITIVE HALF CYCLE OF SAID ALTERNATING CURRENT AND CLOSES A SECOND CIRCUIT THROUGH SAID FIRST WINDING TO PERMIT CURRENT FLOW THERETHROUGH DURING A NEGATIVE HALF CYCLE OF SAID ALTERNATING CURRENT WHENEVER SAID CONTROL SIGNAL IS IN PHASE WITH SAID ALTERNATING CURRENT AND WHICH CLOSES A FIRST CIRCUIT THROUGH SAID SECOND WINDING TO PERMIT CURRENT FLOW THERETHROUGH DURING A POSITIVE HALF CYCLE OF SAID ALTERNATING CURRENT AND CLOSES A SECOND CIRCUIT THROUGH SAID SECOND WINDING TO PERMIT CURRENT FLOW THERETHROUGH DURING A NEGATIVE HALF CYCLE OF SAID ALTERNATING CURRENT WHENEVER SAID CONTROL SIGNAL IS OUT OF PHASE WITH SAID ALTERNATING CURRENT, SAID CIRCUITS THROUGH SAID FIRST WINDING BEING OPEN WHENEVER A CIRCUIT THROUGH SAID SECOND WINDING IS CLOSED AND SAID CIRCUITS THROUGH SAID SECOND WINDING BEING OPEN WHENEVER A CIRCUIT THROUGH SAID FIRST WINDING IS CLOSED.
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) | 1967-10-20 | 1968-04-20 | 1968-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-20 | 1972-04-20 | 1972-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-20 | 1976-04-20 | 1976-10-20 | $7700.00 | Window Closed / Lapsed |