US3698941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of applying contacts to a semiconductor body
Assignee: US Philips Corp
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Filing: 1970-09-09
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Granted: 1972-10-17
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Expires: 1990-09-09
Abstract
Abstract A METHOD OF LOCALLY APPLYING A METAL CONTACT TO A SEMICONDUCTOR SURFACE, IN WHICH THE SURFACE IS PARTLY COVERED BY AN INSULATING LAYER, AFTER WHICH A METAL LAYER IS APPLIED TO THE WHOLE SURFACE. BY SUBJECTING THE METAL LAYER IN ACCORDANCE WITH THE INVENTION TO ACOUSTIC HIGH-FREQUENCY VIBRATIONS, THE METAL LAYER IS REMOVED FROM THE INSULATING LAYER AND IS LEFT ADHERING TO THE SEMICONDUCTOR MATERIAL. THE ADHESION MAY BE IMPROVED BY A THERMAL TREATMENT PRIOR TO THE VIBRATION TREATMENT.
Inventors
- 👤 Dirk De Nobel
- 👤 Jan A G De Waal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:28
CPC Classifications
H; H10; H10P; H10P95/00; H10W; H10W20/00; H10W20/40
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |