US3664893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of four-layer switch with controlled breakover voltage
Assignee: Motorola Solutions Inc
•
Filing: 1968-12-09
•
Granted: 1972-05-23
•
Expires: 1988-12-09
Abstract
Abstract In a four layer switching device, either as a discrete device or as an integrated circuit which may be part of a memory device, a method is disclosed for reliably and consistently controlling the breakover voltage of the control junction during manufacture by diffusing an impurity into the surface of a layer of the opposite conductivity type semiconductor material to form such junction and continuing such diffusing until a solid state solubility concentration of said impurity in the material of said layer, at a predetermined temperature, is reached at the surface of such layer.
Inventors
- 👤 Orville Phillip Frazee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:30
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/08; G11C11/00; G11C11/21; G11C11/34; G11C11/39; H; H10; H10B; H10B99/00; H10B99/20; H10D; H10D84/00; H10D84/01; H10D99/00; Y; Y10; Y10S; Y10S148/00; Y10S148/085; Y10S148/155; Y10S148/157
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3146135A
Cited
US3321745A
Cited
US3204160A
Cited
US3197681A
Cited
US3223904A
Cited
US3243669A
Cited
US3260902A
Cited
US3328651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |