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:
Jul. 23, 2002
Filed:
Nov. 05, 1999
Nobumitsu Takase, Annaka, JP;
Silicon Crystal Research Institute Corp., Gunma, JP;
Abstract
The present invention aims to prevent solidification of a melt in a feeding pipe without providing heating means such as heater or heat keeping means such as heat insulating material on outer periphery of the feeding pipe when the melt is supplied from an auxiliary crucible into a main crucible via the feeding pipe by overflow. At the center of the auxiliary crucible made of quartz, a pipe for feeding the melt from the auxiliary crucible to the main crucible by overflow is formed. When the raw material in the auxiliary crucible is melted, it is designed in such manner that the raw material is not continuously supplied to the auxiliary crucible but it is supplied in such quantity that the melt overflows intermittently into an opening on the upper end of the pipe from the auxiliary crucible into the main crucible