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:
Feb. 22, 2011
Filed:
Jan. 30, 2006
Applicant:
Katsuyuki Torii, Niiza, JP;
Inventor:
Katsuyuki Torii, Niiza, JP;
Assignee:
Sanken Electric Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 23/62 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor devicecomprises a P type base regionformed in an Ntype base region, and Ntype emitter regionsformed plurally in the P type base regionso as to be spaced form each other. The Ntype emitter regionsare formed such that the rate of the area occupied by the Ntype emitter regionin the P type base regionat the center part of the semiconductor deviceis smaller than the rate of the area occupied by the Ntype emitter regionin the P type base regionat the peripheral part of the semiconductor device