US3723210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a semiconductor wafer having concave rim
Assignee: Infineon Technologies Americas Corp
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Filing: 1970-09-29
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Granted: 1973-03-27
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Expires: 1990-09-29
Abstract
Abstract TWO JUNCTIONS OF A CONTROLLED RECTIFIER TERMINATE ON A CONCAVE RIM OF A SEMICONDUCTOR WAFER. BOTH JUNCTIONS TERMINATTE AT AN ANGLE WHICH SPREADS OUT THE VOLTAGE GRADIENT ACROSS THE JUNCTION AT THE RIM. THE CONTOUR IS FORMED BY ETCHING THROUGH THE WAFER AND ETCHING UNDER AN ETCH-RESISTANT COATING IN A CHANNEL WHICH CIRCUMSCRIBES A SURFACE AREA OF THE WAFER.
Inventors
- 👤 N Jacksen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:47
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/69; H10P50/691; H10D; H10D99/00; Y; Y10; Y10S; Y10S438/00; Y10S438/978
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |