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. 06, 1994
Filed:
Feb. 01, 1993
Applicant:
Inventors:
James R Pfiester, Austin, TX (US);
Philip J Tobin, Austin, TX (US);
Assignee:
Motorola Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437 69 ;
Abstract
A layer of silicon-germanium (57) allows electrical isolation structures, having reduced field oxide encroachment, to be formed without adversely effecting the adjacent active regions (64). A high etch selectivity between silicon-germanium and the silicon substrate (52) allows the silicon-germanium layer (57) to be removed, after field oxidation, without damaging the underlying active regions (64).