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:
Nov. 25, 2008
Filed:
Jul. 24, 2006
Applicant:
Keisei Abe, Tokyo, JP;
Inventor:
Keisei Abe, Tokyo, JP;
Assignee:
Sumco Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 21/30 (2006.01); H01L 21/46 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a method for producing a silicon single by pulling the silicon single crystal from a silicon melt contained in a crucible, a magnetic field is applied to the silicon melt in a radial direction of the silicon single crystal, and a vertical level of a center of the magnetic field relative to a surface of the silicon melt is controlled such that a thermal gradient in an axial direction of the crystal is maintained at a constant value in respective portions along a radial direction of the silicon single crystal.