Patent US3404293A successfully refreshed from Google Patents.
US3404293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor switch utilizing series diodes to improve dynamic breakdown capability and reduce time to restore for ward blocking
Assignee: AT&T Inc
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Filing: 1966-03-25
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Granted: 1968-10-01
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Expires: 1986-03-25
Abstract
No abstract record available.
Inventors
- 👤 William B Harris
- 👤 Richard P Massey
- 👤 Frank J Zgebura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:02
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H03K17/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A SWITCH CIRCUIT COMPRISING AT LEAST ONE THYRISTOR HAVING FOUR LAYERS FORMING THREE JUNCTIONS BETWEEN SAID LAYERS, AN ANODE TERMINAL CONNECTED TO THE FIRST OF SAID LAYERS, A GATE TERMINAL CONNECTED TO THE THIRD OF SAID LAYERS AND A CATHODE TERMINAL CONNECTED TO THE FOURTH OF SAID LAYERS, THE MIDDLE JUNCTION EXISTING BETWEEN SAID SECOND AND THIRD LAYERS HAVING AN INHERENT REVERSE RECOVERY TIME, A SERIES-RESONANT TURN-OFF CIRCUIT CONNECTED INTO A CIRCUIT IN SERIES WITH SAID ANODE AND CATHODE TERMINALS, A FIRST DIODE CONNECTED BETWEEN SAID CATHODE AND GATE TERMINALS, A SECOND DIODE CONNECTED BETWEEN SAID ANODE
Claim 2
Dependent Claim
97 words
A SWITCH CIRCUIT COMPRISING AT LEAST ONE THYRISTOR HAVING FOUR LAYERS FORMING THREE JUNCTIONS BETWEEN SAID LAYERS, AN ANODE TERMINAL CONNECTED TO THE FIRST OF SAID LAYERS, A GATE TERMINAL CONNECTED TO THE THIRD OF SAID LAYERS AND A CATHODE TERMINAL CONNECTED TO THE FOURTH OF SAID LAYERS, THE MIDDLE JUNCTION EXISTING BETWEEN SAID SECOND AND THIRD LAYERS HAVING AN INHERENT REVERSE RECOVERY TIME, A SERIES-RESONANT TURN-OFF CIRCUIT CONNECTED INTO A CIRCUIT IN SERIES WITH SAID ANODE AND CATHODE TERMINALS, A FIRST DIODE CONNECTED BETWEEN SAID CATHODE AND GATE TERMINALS, A SECOND DIODE CONNECTED BETWEEN SAID ANODE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |