US3428821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallel switching device
Assignee: BBC Brown Boveri AG Germany
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Filing: 1966-10-17
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Granted: 1969-02-18
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Expires: 1986-10-17
Abstract
No abstract record available.
Inventors
- 👤 Leon Ruffieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:46
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/38; H02J3/40; H02J3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
APPARATUS FOR CONNECTING TWO ALTERNATING VOLTAGES IN PARALLEL COMPRISING MEANS FOR CONVERTING EACH OF SAID VOLTAGES INTO SUBSTANTIALLY RECTANGULAR PULSE FORM, MEANS COMPARING SAID VOLTAGES IN PULSE FORM TO OBTAIN THE DIFFERENCE VOLTAGE PULSE, MEANS RECTIFYING SAID DIFFERENCE VOLTAGE PULSE TO OBTAIN A DIRECT CONTROL VOLTAGE PULSE THE WIDTH OF WHICH CONSTITUTES A MEASURE OF THE DISPLACEMENT IN PHASE BETWEEN SAID ALTERNATING VOLTAGES, MEANS INTEGRATING SAID CONTROL PULSE TO OBTAIN A CONTROL VOLTAGE, FIRST AND SECOND DIFFERENTIAL RELAYS, ONE WINDING OF EACH SAID DIFFERENTIAL RELAY BEING CONNECTED TO SAID CONTROL VOLTAGE AND THE OTHER WINDING OF EACH SAID DIFFERENTIAL RELAY BEING CONNECTED RESPECTIVELY TO REFERENCE VOLTAGES OF DIFFERENT MAGNITUDE THEREBY TO EFFECT A SEQUENTIAL ACTUATION OF SAID RELAYS, MEANS PRODUCING A MASTER TIME REFERENCE INTERVAL, MEANS COMPARING THE ACTUAL TIME INTERVAL BETWEEN SUCCESSIVE ACTUATION OF SAID RELAYS WITH SAID MASTER TIME INTERVAL REFERENCE TO PRODUCE A DIFFERENCE TIME INTERVAL, RELAY MEANS FOR SWITCHING SAID ALTERNATING VOLTAGES IN PARALLEL, RELAY MEANS FOR EFFECTING A CHANGE IN FREQUENCY OF ONE OF SAID ALTERNATING VOLTAGES, AND MEANS FOR ACTUATING SAID PARALLEL SWITCHING-IN MEANS OR SAID FREQUENCY CHANGING MEANS DEPENDENT UPON THE SENSE OF SAID DIFFERENCE TIME INTERVAL.
Claim 2
Dependent Claim
194 words
APPARATUS FOR CONNECTING TWO ALTERNATING VOLTAGES IN PARALLEL COMPRISING MEANS FOR CONVERTING EACH OF SAID VOLTAGES INTO SUBSTANTIALLY RECTANGULAR PULSE FORM, MEANS COMPARING SAID VOLTAGES IN PULSE FORM TO OBTAIN THE DIFFERENCE VOLTAGE PULSE, MEANS RECTIFYING SAID DIFFERENCE VOLTAGE PULSE TO OBTAIN A DIRECT CONTROL VOLTAGE PULSE THE WIDTH OF WHICH CONSTITUTES A MEASURE OF THE DISPLACEMENT IN PHASE BETWEEN SAID ALTERNATING VOLTAGES, MEANS INTEGRATING SAID CONTROL PULSE TO OBTAIN A CONTROL VOLTAGE, FIRST AND SECOND DIFFERENTIAL RELAYS, ONE WINDING OF EACH SAID DIFFERENTIAL RELAY BEING CONNECTED TO SAID CONTROL VOLTAGE AND THE OTHER WINDING OF EACH SAID DIFFERENTIAL RELAY BEING CONNECTED RESPECTIVELY TO REFERENCE VOLTAGES OF DIFFERENT MAGNITUDE THEREBY TO EFFECT A SEQUENTIAL ACTUATION OF SAID RELAYS, MEANS PRODUCING A MASTER TIME REFERENCE INTERVAL, MEANS COMPARING THE ACTUAL TIME INTERVAL BETWEEN SUCCESSIVE ACTUATION OF SAID RELAYS WITH SAID MASTER TIME INTERVAL REFERENCE TO PRODUCE A DIFFERENCE TIME INTERVAL, RELAY MEANS FOR SWITCHING SAID ALTERNATING VOLTAGES IN PARALLEL, RELAY MEANS FOR EFFECTING A CHANGE IN FREQUENCY OF ONE OF SAID ALTERNATING VOLTAGES, AND MEANS FOR ACTUATING SAID PARALLEL SWITCHING-IN MEANS OR SAID FREQUENCY CHANGING MEANS DEPENDENT UPON THE SENSE OF SAID DIFFERENCE TIME INTERVAL.
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |