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:
Dec. 28, 1993
Filed:
Feb. 08, 1993
Applicant:
Inventors:
Helmut Tews, Unterhaching, DE;
Hans-Peter Zwicknagl, Stuttgart, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257592 ; 257197 ; 257198 ;
Abstract
A permeable base transistor has an emitter layer or emitter layer sequence composed of a semiconductor material which has a greater energy band gap than a semiconductor material of a base layer. This emitter layer or emitter layer sequence is selectively grown into an opening of the base layer and onto a collector layer situated therebelow.