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. 01, 2009
Filed:
Apr. 26, 2004
Makoto Iida, Gunma, JP;
Makoto Iida, Gunma, JP;
Shin-Etsu Handotai Co., Ltd., Tokyo, JP;
Abstract
A method for producing a single crystal by Czochralski method with pulling a seed crystal from a raw material melt, wherein in which a range of a pulling rate of pulling a single crystal, a temperature gradient at a solid-liquid interface and a highest temperature at an interface between a crucible and a raw material melt are defined. The single crystal is pulled with controlling the pulling rate and/or the temperature gradient at a solid-liquid interface within the determined range. The method produces a single crystal in which a desired defect region and/or a desired defect-free region can be determined more precisely and a single crystal with desired quality can be more surely pulled.