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. 16, 1997
Filed:
Feb. 03, 1995
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257183 ; 257192 ; 257197 ; 257201 ; 257615 ;
Abstract
A high-speed heterojunction transistor includes a first region for controlling current, and a second region for receiving carriers which have passed the first region. An energy level difference between a lowermost valley of energy and an upper valley of energy in the conduction band of a semiconductor material constituting the second region is greater than that of a semiconductor material constituting the first region.