Semiconductor bilateral switching device
Abstract
Abstract A SEMICONDUCTOR BILATERAL SWITCH DEVICE COMPRISES A RELATIVELY THICK WAFER OF MATERIAL OF ONE ELECTRICAL CONDUCTIVITY TYPE AND RELATIVELY HIGH RESISTIVITY, A PAIR OF REGIONS OF THE SAM ELECTRICAL CONDUCTIVITY TYPE, BUT OF LOWER RESISTIVITY FORMED IN OPPOSITE FACES OF THE WAFER, AND ANOTHER PAIR OF REGIONS OF AN OPPOSITE ELECTRICAL CONDUCTIVITY TYPE FORMED IN OPPOSITE FACES OF THE WAFTER WITHIN THE FIRST MENTIONED PAIR OF REGIONS, RESPECTIVELY, WITH ELECTRODES ATTACHED TO THE LAST MENTIONED REGIONS. THE DEVICE EXHIBITS A NEGATIVE RESISTANCE CHARACTERISTIC FOR CURRENTS ABOVE A PREDETERMINED BREAKDOWN CURRENT, AND IS EMPLOYED TO APPLY A CONTROL SIGNAL TO SEMICONDUCTOR POWER SWITCHES. D R A W I N G
Inventors
- 👤 Jearld L Hutson
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |