The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2002
Filed:
Jul. 21, 1999
Makiko Nakamura, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A first insulating film, a first wiring layer and a second insulating film are successively formed over a semiconductor substrate. A resist mask is patterned over the second insulating film, and isotropic etching and anisotropic etching are successively carried out to define a plurality of via holes within the second insulating film. The via holes thus have a first portion formed by the isotropic etching and a second portion formed by the anisotropic etching. The resist mask is removed, and a high melting-point metal film is formed over the second insulating film so as to be embedded in the plurality of via holes. The high melting-point metal film and the second insulating film are then polished down to the first portion of each of the via holes such that respective portions of the high melting-point metal film formed within adjacent ones of the plurality of via holes are isolated from each other. A second wiring layer is then formed so as to be electrically connected to the first wiring layer through the portions of the high melting-point metal film formed within the plurality of via holes.