US3238442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote control variable autotransformer system
Assignee: General Radio Co
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Filing: 1962-02-12
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Granted: 1966-03-01
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Expires: 1982-02-12
Abstract
No abstract record available.
Inventors
- 👤 Malcolm C Holtje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:06
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A REMOTE CONTROL VARIABLE AUTOTRANSFORMER SYSTEM HAVING, IN COMBINATION COMMAND AND DRIVEN VARIABLE AUTOTRANSFORMERS EACH HAVING A WINDING ALONG SUCCESSIVE POSITIONS BETWEEN OPPOSITE TERMINALS OF WHICH A BRUSH MAY BE POSITIONED TO TAP OFF VARIOUS VOLTAGES, MEANS FOR SUPPLYING ALTERNATING-CURRENT VOLTAGE OF PREDETERMINED FREQUENCY AND PHASE BETWEEN OPPOSITE TERMINALS OF THE COMMAND AUTOTRANSFORMER WINDING, MEEANS FOR SUPPLYING ALTERNATING-CURRENT VOLTAGE OF SUBSTANTIALLY THE SAME FREQUENCY AND PHASE BETWEEN OPPOSITE TERMINALS OF THE DRIVEN AUTOTRANSFORMER WINDING, AN ELECTRIC CIRCUIT INCLUDING VOLTAGE STEP-UP MEANS CONNECTED BETWEEN THE BRUSHES OF THE COMMAND AND DRIVEN AUTOTRANSFORMERS FOR DEVELOPING AND STEPPING UP A DIFFERENCE VOLTAGE REPRESENTATIVE OF ANY DIFFERENCE IN VOLTAGE BETWEEN THE VOLTAGES TAPPED OFF UPON THE AUTOTRANSFORMERS BY THEIR RESPECTIVE BRUSHES, AND MEANS COMPRISING AN ELECTRIC MOTOR HAVING AT LEAST TWO PHASE AND CONTROLLED BY THE STEPPED-UP DIFFERENCE VOLTAGE FOR MOVING THE BRUSH OF THE DRIVEN AUTOTRANSFORMER TO A POSITION THAT EFFECTS REDUCTION OF SAID DIFFERENCE VOLTAGE TO SUBSTANTIALLY ZERO, THE ELECTRIC CIRCUIT BEING PROVIDED WITH MEANS FOR LIMITING THE CURRENT THEREIN IN ORDER TO SAFEGUARD THE SAID MOTOR AGAINST TOO GREAT A CONTROLLING VOLTAGE.
Claim 2
Dependent Claim
181 words
A REMOTE CONTROL VARIABLE AUTOTRANSFORMER SYSTEM HAVING, IN COMBINATION COMMAND AND DRIVEN VARIABLE AUTOTRANSFORMERS EACH HAVING A WINDING ALONG SUCCESSIVE POSITIONS BETWEEN OPPOSITE TERMINALS OF WHICH A BRUSH MAY BE POSITIONED TO TAP OFF VARIOUS VOLTAGES, MEANS FOR SUPPLYING ALTERNATING-CURRENT VOLTAGE OF PREDETERMINED FREQUENCY AND PHASE BETWEEN OPPOSITE TERMINALS OF THE COMMAND AUTOTRANSFORMER WINDING, MEEANS FOR SUPPLYING ALTERNATING-CURRENT VOLTAGE OF SUBSTANTIALLY THE SAME FREQUENCY AND PHASE BETWEEN OPPOSITE TERMINALS OF THE DRIVEN AUTOTRANSFORMER WINDING, AN ELECTRIC CIRCUIT INCLUDING VOLTAGE STEP-UP MEANS CONNECTED BETWEEN THE BRUSHES OF THE COMMAND AND DRIVEN AUTOTRANSFORMERS FOR DEVELOPING AND STEPPING UP A DIFFERENCE VOLTAGE REPRESENTATIVE OF ANY DIFFERENCE IN VOLTAGE BETWEEN THE VOLTAGES TAPPED OFF UPON THE AUTOTRANSFORMERS BY THEIR RESPECTIVE BRUSHES, AND MEANS COMPRISING AN ELECTRIC MOTOR HAVING AT LEAST TWO PHASE AND CONTROLLED BY THE STEPPED-UP DIFFERENCE VOLTAGE FOR MOVING THE BRUSH OF THE DRIVEN AUTOTRANSFORMER TO A POSITION THAT EFFECTS REDUCTION OF SAID DIFFERENCE VOLTAGE TO SUBSTANTIALLY ZERO, THE ELECTRIC CIRCUIT BEING PROVIDED WITH MEANS FOR LIMITING THE CURRENT THEREIN IN ORDER TO SAFEGUARD THE SAID MOTOR AGAINST TOO GREAT A CONTROLLING VOLTAGE.
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |