US3448300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing circuit for solid state controllable valves in high di/dt applications
Assignee: Westinghouse Electric Corp
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Filing: 1965-12-21
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Granted: 1969-06-03
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Expires: 1985-12-21
Abstract
Abstract Firing circuitry is disclosed for controlled switching devices such as silicon controlled rectifiers wherein a capacitor is charged during the OFF time of the switching device and is discharged into the gate electrode of the switching device at the same time that a conventional firing pulse is applied thereto, thereby providing a composite firing signal having a high initial amplitude which decays to the level of the conventional pulse.
Inventors
- 👤 Laszlo Gyugyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:25
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H02; H02M; H02M1/00; H02M1/08; H03K3/313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3188490A
Cited
US3384763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |