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:
Sep. 16, 2008
Filed:
Feb. 25, 2004
Hiroyuki Akatsu, Yorktown Heights, NY (US);
Rama Divakaruni, Ossining, NY (US);
Gregory G. Freeman, Hopewell Junction, NY (US);
David R. Greenberg, White Plains, NY (US);
Marwan H. Khater, Poughkeepsie, NY (US);
William R. Tonti, Essex Junction, VT (US);
Hiroyuki Akatsu, Yorktown Heights, NY (US);
Rama Divakaruni, Ossining, NY (US);
Gregory G. Freeman, Hopewell Junction, NY (US);
David R. Greenberg, White Plains, NY (US);
Marwan H. Khater, Poughkeepsie, NY (US);
William R. Tonti, Essex Junction, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A bipolar transistor is provided which includes a tapered, i.e. frustum-shaped, collector pedestal having an upper substantially planar surface, a lower surface, and a slanted sidewall extending between the upper surface and the lower surface, the upper surface having substantially less area than the lower surface. The bipolar transistor further includes an intrinsic base overlying the upper surface of the collector pedestal, a raised extrinsic base conductively connected to the intrinsic base and an emitter overlying the intrinsic base. In a particular embodiment, the emitter is self-aligned to the collector pedestal, having a centerline which is aligned to the centerline of the collector pedestal.