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:
Mar. 03, 2009
Filed:
Oct. 05, 2005
Kenji Yakushiji, Ichihara, JP;
Katsuki Kusunoki, Ichihara, JP;
Hisayuki Miki, Ichihara, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
An object of the present invention is to provide a method of producing a Group III nitride semiconductor device having a chip form which is pentagonal or more highly polygonal maintaining good area efficiency and at a low cost. The inventive method of producing a Group III nitride semiconductor device having a chip shape which is a pentagonal or more highly polygonal shape comprises a first step of epitaxially growing a Group III nitride semiconductor on a substrate to form a semiconductor wafer; a second step of irradiating said semiconductor wafer with a laser beam to form separation grooves; a third step of grinding and/or polishing the main surface side differently from the epitaxially grown main surface of the substrate; and a fourth step of division into individual chips by applying stress to said separation grooves.