Patent US2430921A successfully refreshed from Google Patents.
US3214677A
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Circuit for controlling transient voltages to prevent premature triggering of semiconductors
Assignee: Allis Chalmers Corp
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Filing: 1961-09-11
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Granted: 1965-10-26
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Baude John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/005; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/722; H03K17/723
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A CIRCUIT FOR CONTROLLING ELECTRIC CURRENT COMPRISING A SOURCE OF ELECTRIC POWER, A LOAD, A SEMICONDUCTOR HAVING THREE ELECTRODES, MEANS FOR CONNECTING TWO OF SAID ELECTRODES IN SERIES WITH SAID LOAD ACROSS SAID SOURCE, AN ELECTRIC CIRCUIT CONNECTED ACROSS SAID TWO OF SAID ELECTRODES WHERE SURGE IMPULSES MAY BE INTRODUCED, MEANS CONNECTED IN SERIES WITH SAID TWO OF SAID ELECTRODES AND IN PARALLEL WITH SAID LOAD FOR REDUCING THE EFFECT OF SAID SURGE IMPULES TO PREVENT PREMATURE TRIGGERING OF SAID SEMICONDUCTOR, AND SIGNAL MEANS CONNECTED TO THE THIRD OF SAID ELECTRODES FOR TRIGGERING SAID SEMICONDUCTOR INTO CONDUCTION CAUSING CURRENT TO FLOW THROUGH SAID TWO ELECTRODES AND SAID LOAD.
Claim 2
Dependent Claim
108 words
A CIRCUIT FOR CONTROLLING ELECTRIC CURRENT COMPRISING A SOURCE OF ELECTRIC POWER, A LOAD, A SEMICONDUCTOR HAVING THREE ELECTRODES, MEANS FOR CONNECTING TWO OF SAID ELECTRODES IN SERIES WITH SAID LOAD ACROSS SAID SOURCE, AN ELECTRIC CIRCUIT CONNECTED ACROSS SAID TWO OF SAID ELECTRODES WHERE SURGE IMPULSES MAY BE INTRODUCED, MEANS CONNECTED IN SERIES WITH SAID TWO OF SAID ELECTRODES AND IN PARALLEL WITH SAID LOAD FOR REDUCING THE EFFECT OF SAID SURGE IMPULES TO PREVENT PREMATURE TRIGGERING OF SAID SEMICONDUCTOR, AND SIGNAL MEANS CONNECTED TO THE THIRD OF SAID ELECTRODES FOR TRIGGERING SAID SEMICONDUCTOR INTO CONDUCTION CAUSING CURRENT TO FLOW THROUGH SAID TWO ELECTRODES AND SAID LOAD.
References Cited (Backward Citations)
CA524787A
Cited
US2033013A
Cited
US3058036A
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US3058034A
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US3067338A
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US3047746A
Cited
US3049632A
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US3099789A
Cited
US3060348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |