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. 05, 1999
Filed:
Sep. 16, 1998
Toru Takizawa, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
In a bidirectional surge protection device formed on a semiconductor substrate, buried layers, which have the same conduction type as and are higher in impurity concentration than the semiconductor substrate, are formed on the entire surfaces of the device regions provided on both surfaces of the semiconductor substrate or formed under emitter-push restraining layers alone, wherein injection of minority carriers from a surface opposite to the surface on which the device operates is restrained to lower a holding current. As a result, the bidirectional surge protection device easily becomes OFF once it becomes ON.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile