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:
Apr. 07, 2026
Filed:
Nov. 05, 2021
Sumco Corporation, Tokyo, JP;
Ryusuke Yokoyama, Tokyo, JP;
Wataru Sugimura, Tokyo, JP;
SUMCO CORPORATION, Tokyo, JP;
Abstract
A heating portion heats a silicon melt in a quartz crucible. The heating portion includes: a heat generation portion integrally molded into a cylinder; and four power supply portions for supplying electric power to the heat generation portion. When the heating portion is divided by a virtual plane into two including a first heating region located on one side of the heat generation portion and a second heating region located on the other side of the heat generation portion with respect to the virtual plane, the virtual plane passing through a center axis of the heat generation portion and being perpendicular to the heat generation portion and parallel to a central magnetic field line of a horizontal magnetic field applied to the silicon melt, a heat generation amount of the first heating region and a heat generation amount of the second heating region are set to different values.