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:
Jun. 01, 1976
Filed:
Nov. 18, 1974
Applicant:
Inventors:
Shakir A Abbas, Wappingers Falls, NY (US);
Chi S Chang, Wappingers Falls, NY (US);
Leo B Freeman, Jr, Poughkeepsie, NY (US);
Ronald W Knepper, Fishkill, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 49 ; 357 24 ; 357 41 ; 357 45 ; 307238 ;
Abstract
A semiconductor device has a heavily doped semiconductor substrate with a lightly doped epitaxial layer overlying a surface of the substrate and of the same conductivity type as the substrate. Electrically insulating barriers extend from at least the surface of the epitaxial layer into the substrate so as to electrically isolate non-common areas of each surface leakage sensitive device within the epitaxial layer from the non-common areas of adjacent surface leakage sensitive devices.