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. 31, 2012
Filed:
Feb. 23, 2010
Katsuya Arai, Kyoto, JP;
Toshihiro Kougami, Kyoto, JP;
Hiroaki Yabu, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A semiconductor integrated circuit includes: a wellof a first conductivity type formed on a substrate; a first external terminal, a second external terminal, and a third external terminalprovided above the substrate; a first protection circuitprovided on an electrical path between the first external terminaland the second external terminal; a second protection circuitprovided on an electrical path between the second external terminaland the third external terminal; and a third protection circuitprovided on an electrical path between the third external terminaland the first external terminal. A guard ringis formed continuously in the well to surround at least two circuits among the first, second, and third protection circuits, and, formed on the well