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. 04, 1990
Filed:
Jan. 22, 1990
Applicant:
Inventor:
Chakrapani G Jambotkar, Hopewell Junction, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437 31 ; 437228 ; 437203 ; 437133 ; 437 36 ; 437184 ; 357 34 ;
Abstract
Heterojunction bipolar transistor technology employing in a body wherein a larger area base electrode over a buried electrode has above it a smaller area electrode, an overhang capability on the portion of the smaller area electrode that operates to mask the base layer in converting the extrinsic portion to high conductivity and assist lift-off of base contact metal such that the base contact metal is in extremely close proximity to the smaller area electrode.