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. 19, 2004
Filed:
Dec. 14, 2001
Minoru Suzuki, Saitama, JP;
Susumu Yoshida, Saitama, JP;
Shindengen Electric Manufacturing Co., Ltd., Tokyo, JP;
Abstract
In order to provide a reliable surge protective component with a straightforward manufacturing process, first and second buried layers are diffused over the entire inside surfaces of a semiconductor substrate, and first and second base layers are then diffused over the entire inside surfaces of the first and second buried layers. First and second emitter layers are then partially diffused at the inside of the first and second base layers. The peripheries of the first and second emitter layers are then surrounded by first and second moats, the bottoms of which reach the first and second buried layers. A PN junction formed between the first and second base layers and first and second buried layers is then simply a planar junction.