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US3831068A Expired / Lapsed US ⏱️ 0.0 years remaining

Metal-semiconductor small-surface contacts

Assignee: Siemens AG
•
Filing: 1972-09-05
•
Granted: 1974-08-20
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Expires: 1992-09-05
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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)

US3368124A Cited
US3451912A Cited
US3518506A Cited
US3695955A Cited
US3686698A Cited

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

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