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:
Oct. 31, 2006
Filed:
Nov. 19, 2004
Ming-dou Ker, Hsinchu, TW;
Kun-hsien Lin, Pingtung County, TW;
Geeng-lih Lin, Hsinchu Hsien, TW;
Vanguard International Semiconductor Corporation, Hsinchu, TW;
Abstract
An ESD protection device. The ESD protection device has a substrate; a channel region, a source region, and a drain region. The channel region is formed on a predetermined area of a surface of the substrate, the channel region has a first side and a second side. The source region is formed adjacent to the first side. The drain region which has a heavily doped region and a lightly doped region formed below the heavily doped region is formed adjacent to the second side. The width along a longitudinal axis of the heavily doped region has variable length and thus the length between one side of the heavily doped region to the second side has variable length.