US3209238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control apparatus with protective device
Assignee: Schneider Electric USA Inc
•
Filing: 1961-12-01
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Granted: 1965-09-28
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Expires: 1981-12-01
Abstract
No abstract record available.
Inventors
- 👤 Robert C Mierendorf
- 👤 Clarence W Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:20
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/248
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN AN ELECTRONIC CONTACTOR, THE COMBINATION COMPRISING A TRANSFORMER ARRANGED TO SUPPLY ALTERNATING CURRENT TO AN ALTERNATING CURRENT LOAD, A PAIR OF ELECTRONIC SWITCHES ARRANGED TO CONTROL THE FLOW OF ALTERNATING CURRENT THROUGH THE TRANSFORMER, A PHASE-SHIFTING MEANS CONNECTED TO A CONTROL ELECTRODE OF THE ELECTRONIC SWITCHES AND OEPRATIVE TO CONROL THE CONDUCTION PERIODS OF THE SWITCHES AND TO CAUSE THE SWITCHES TO SUPPLY ALTERNATE HALF WAVES OF CURRENT OF PREDETERMINED MAGNITUDE TO THE TRANSFORMER, A METER RELAY OPERATIVELY CONNECTED TO THE TRANSFORMER AND THE SWITCHES SO AS TO BE RESPONSIVE TO CURRENT FLOWING THROUGH THE TRANSFORMER AND THE SWITCHES FOR DETECTING FAILURE OF EITHER ONE OF THE SWITCHES, SAID METER RELAY INCLUDING MEANS OPERATIVELY UPON FAILURE OF EITHER ONE OF THE PAIR OF SWITCHES TO INDICATE WHICH ONE OF THE SWITCHES FAILED, ELECTRORESPONSIVE RELAY MEANS OP-
Claim 2
Dependent Claim
137 words
IN AN ELECTRONIC CONTACTOR, THE COMBINATION COMPRISING A TRANSFORMER ARRANGED TO SUPPLY ALTERNATING CURRENT TO AN ALTERNATING CURRENT LOAD, A PAIR OF ELECTRONIC SWITCHES ARRANGED TO CONTROL THE FLOW OF ALTERNATING CURRENT THROUGH THE TRANSFORMER, A PHASE-SHIFTING MEANS CONNECTED TO A CONTROL ELECTRODE OF THE ELECTRONIC SWITCHES AND OEPRATIVE TO CONROL THE CONDUCTION PERIODS OF THE SWITCHES AND TO CAUSE THE SWITCHES TO SUPPLY ALTERNATE HALF WAVES OF CURRENT OF PREDETERMINED MAGNITUDE TO THE TRANSFORMER, A METER RELAY OPERATIVELY CONNECTED TO THE TRANSFORMER AND THE SWITCHES SO AS TO BE RESPONSIVE TO CURRENT FLOWING THROUGH THE TRANSFORMER AND THE SWITCHES FOR DETECTING FAILURE OF EITHER ONE OF THE SWITCHES, SAID METER RELAY INCLUDING MEANS OPERATIVELY UPON FAILURE OF EITHER ONE OF THE PAIR OF SWITCHES TO INDICATE WHICH ONE OF THE SWITCHES FAILED, ELECTRORESPONSIVE RELAY MEANS OP-
References Cited (Backward Citations)
US2574374A
Cited
US2703383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |