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. 13, 1998
Filed:
Dec. 17, 1996
John D Walker, Colorado Springs, CO (US);
Todd A Randazzo, Colorado Springs, CO (US);
Gayle W Miller, Colorado Springs, CO (US);
Symbios, Inc., Fort Collins, CO (US);
Abstract
The present invention provides a semiconductor protection device in a substrate having a first type of conductivity. The semiconductor protection device includes two vertical bipolar transistors. A well region is located within the substrate having a second type of conductivity with a base region within the well region having a first type of conductivity. A first doped region having the second type of conductivity and a second doped region having a first type of conductivity are located within the well region. A third doped region having the second type of conductivity and a fourth doped region having the first type of conductivity are located within the base region. A doped region having a first type of conductivity is located within the substrate. This doped region is connected to the fourth doped region.