US3444398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor switch utilizing diodes to improve recovery time
Assignee: AT&T Inc
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Filing: 1966-05-10
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Granted: 1969-05-13
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Expires: 1986-05-10
Abstract
No abstract record available.
Inventors
- 👤 Dennis V Brockway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:55
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A SWITCH CIRCUIT COMPRISING AT LEAST ONE THYRISTOR HAVING FOUR LAYERS FORMING THREE JUNCTIONS BETWEEN SAID LAYERS, THE MIDDLE JUNCTION EXISTING BETWEEN SAID SECOND AND THIRD LAYERS HAVING AN INHERENT REVERSE RECOVERY TIME, AN ANODE TERMINAL CONNECTED TO THE FIRST LAYER, AN ANODE GATE TERMINAL CONNECTED TO THE SECOND LAYER, A GATE TERMINAL CONNECTED TO THE THIRD LAYER, A CATHODE TERMINAL CONNECTED TO THE FOURTH LAYER, A TURN-OFF CIRCUIT CONNECTED IN SERIES WITH SAID ANODE AND CATHODE TERMINALS CAPABLE OF DRIVING A REVERSE CURRENT FROM SAID CATHODE TERMINAL TO SAID ANODE TERMINAL, A FIRST DIODE CONNECTED BETWEEN SAID CATHODE AND GATE TERMINALS, A SECOND DIODE CONNECTED BETWEEN SAID GATE AND ANODE TERMINALS, AND A THIRD DIODE CONNECTED BETWEEN SAID CATHODE AND ANODE GATE TERMINALS, THE REVERSE RECOVERY TIME OF SAID MIDDLE JUNCTION BEING LESS THAN THAT OF SAID FIRST DIODE AND GREATER THAN THAT OF SAID SECOND AND THIRD DIODES.
Claim 2
Dependent Claim
150 words
A SWITCH CIRCUIT COMPRISING AT LEAST ONE THYRISTOR HAVING FOUR LAYERS FORMING THREE JUNCTIONS BETWEEN SAID LAYERS, THE MIDDLE JUNCTION EXISTING BETWEEN SAID SECOND AND THIRD LAYERS HAVING AN INHERENT REVERSE RECOVERY TIME, AN ANODE TERMINAL CONNECTED TO THE FIRST LAYER, AN ANODE GATE TERMINAL CONNECTED TO THE SECOND LAYER, A GATE TERMINAL CONNECTED TO THE THIRD LAYER, A CATHODE TERMINAL CONNECTED TO THE FOURTH LAYER, A TURN-OFF CIRCUIT CONNECTED IN SERIES WITH SAID ANODE AND CATHODE TERMINALS CAPABLE OF DRIVING A REVERSE CURRENT FROM SAID CATHODE TERMINAL TO SAID ANODE TERMINAL, A FIRST DIODE CONNECTED BETWEEN SAID CATHODE AND GATE TERMINALS, A SECOND DIODE CONNECTED BETWEEN SAID GATE AND ANODE TERMINALS, AND A THIRD DIODE CONNECTED BETWEEN SAID CATHODE AND ANODE GATE TERMINALS, THE REVERSE RECOVERY TIME OF SAID MIDDLE JUNCTION BEING LESS THAN THAT OF SAID FIRST DIODE AND GREATER THAN THAT OF SAID SECOND AND THIRD DIODES.
References Cited (Backward Citations)
US3404293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |