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, 1992
Filed:
Jun. 27, 1991
NKK Corporation, Tokyo, JP;
Abstract
In a silicon single crystal manufacturing apparatus of the type which continuously feeds starting material, a metallic heat keeping plate is arranged to cover a partition member dividing molten silicon into a single crystal growing section and a material melting section within a quartz crucible and an upper side of the material melting section. The metallic heat keeping plate is provided for the purpose of preventing the occurrence of solidification of the molten silicon on the inner side of the partition member and preventing excessive cooling of a silicon single crystal. The metallic heat keeping plate has a thickness of 3 mm or less and its material is tantalum or molybdenum. Further, the heat keeping plate includes a straight body portion formed with a plurality of openings for adjusting the temperature of the single crystal.