USRE27440E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor rectifier with improved turn-on and turn-off characteristics
Assignee: —
•
Filing: 1970-10-27
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Granted: 1972-07-18
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Expires: 1990-10-27
Abstract
Abstract THE SWITCHING CAPABILITIES OF A 4-LAYER BROAD AREA PNPN SEMICONDUCTOR DEVICE ARE DRAMATICALLY IMPROVED BY PROVIDING AN ELECTRODE-LESS AUXILIARY REGION ON ONE OF THE END LAYERS IN THE VICINITY OF THE SMALL AREA WHERE CONDUCTION BEGINS, AND BY CONSTRUCTING AND ARRANGING THE AUXILIARY REGION SO THAT LOAD CURRENT INITIALLY TRAVERSING IT ACTS AS A HIGH-CURRENT PEREMPTORY TRIGGER SIGNAL FOR THE LATERALLY-ADJACENT MAIN REGION OF BROADER AREA.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:42
CPC Classifications
H; H10; H10D; H10D99/00; H10D62/00; H10D62/10; H10D62/13
Claims Analysis
Total Claims: 0
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |