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. 14, 2011
Filed:
May. 06, 2009
Applicants:
Takaaki Shiota, Tokyo, JP;
Takashi Nakayama, Tokyo, JP;
Tomoyuki Kabasawa, Tokyo, JP;
Inventors:
Assignee:
SUMCO Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 21/20 (2006.01); H01L 21/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a silicon wafer having an oxygen precipitate layer, a depth of DZ layer ranging from a wafer surface to an oxygen precipitate layer is 2 to 10 μm and an oxygen precipitate concentration of the oxygen precipitate layer is not less than 5×10precipitates/cm.