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. 23, 1990
Filed:
Sep. 20, 1972
Ingrid E Magdo, Hopewell Junction, NY (US);
Steven Magdo, Hopewell Junction, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A dielectrically isolated semiconductor device which is substantially planar can be manufactured. The structure is useable for integrated circuits wherein a significant savings in surface area can be obtained over prior techniques. The structure is particularly useful for bipolar integrated circuits wherein a semiconductor substrate with an epitaxial layer thereon contains a buried region partially in the substrate and in the epitaxial layer. The emitter and base regions are located in the epitaxial layer above the buried region. The dielectrically isolating region surrounds the emitter and base region at the surface and extends to a depth wherein it intersects with the buried region to fully isolate the device. The buried region is connected as the collector element of the transistor.