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:
Jul. 07, 2009
Filed:
Jul. 28, 2005
Hiroshi Yamada, Gunma, JP;
Keiichi Yamaguchi, Gifu, JP;
Hiroshi Yamada, Gunma, JP;
Keiichi Yamaguchi, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
The invention is directed to improvement of reliability of a process of separating a layer to be patterned such as a wiring layer in a semiconductor device manufacturing method. A wiring layer is formed on a back surface of a semiconductor substrate. A third resist layer (positive resist layer) is formed on the wiring layer, having an opening in a predetermined region along a dicing line at a bottom of the opening, and the wiring layer is etched using the third resist layer as a mask. After the third resist layer is removed, a fourth resist layer (negative resist layer) is formed on the wiring layer so as to leave the wiring layer in a region of a predetermined pattern, and the wiring layer is etched using the fourth resist layer as a mask. The wiring layer is thus patterned so as to form the predetermined pattern and be separated at the predetermined region along the dicing line at the bottom of the opening without fail.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile