US3831068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-semiconductor small-surface contacts
Assignee: Siemens AG
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Filing: 1972-09-05
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Granted: 1974-08-20
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Expires: 1992-09-05
Abstract
Abstract Metal-semiconductor low capacitance contacts are produced by depositing a first metal layer on a semiconductor surface in the pattern corresponding to a desired contact pattern, applying a second metal layer on the first metal layer and coating all exposed metal and semiconductor surfaces with an insulator layer. Then areas of the insulator above the second metal layer are removed to expose only the underlying second metal surface and a third metal is deposited on such exposed second metal surface in an amount sufficient to extend beyond the upper surface or plane of the insulator coating and form a sufficiently large surface for contacting a given electrical component.
Inventors
- 👤 H Kniepkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:20
CPC Classifications
H; H10; H10D; H10D64/00; H10D64/01; H10D64/012; H10D64/0124; H10D64/0125; H10D64/011; H10D64/0116; H10W; H10W20/00; H10W20/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
A metal-semiconductor small-surface contact member as defined in claim 1, wherein said semiconductor member comprises an epitaxial layer on a highly doped substrate.
Claim 2
Dependent Claim
30 words
A metal-semiconductor small-surface contact member as defined in claim 1, wherein said second metal layer is composed of a material selected from the group consisting of gold, silver and nickel.
Claim 3
Dependent Claim
31 words
A metal-semiconductor small-surface contact member as defined in claim 1, wherein said insulator coating is composed of an electrically insulating material selected from the group consisting of SiO2, Al2O3 and Si3N4.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |