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:
Feb. 10, 2004
Filed:
Mar. 13, 2002
Sumitomo Mitsubishi Silicon Corporation, Tokyo, JP;
Abstract
To impart flexibility suitable for recovery of a quartz crucible to a divided type graphite crucible and avoid damage to the quartz crucible due to the flexibility. A graphite crucible is divided into two or more parts by radial dividing lines . An opening is provided in a center of a bottom of the graphite crucible . A protrusion fitting into the opening is provided on a crucible placing surface of a crucible tray . An inner diameter d of the opening is 0.04 to 0.9 times an inner diameter d of a straight body portion of the graphite crucible . An outer diameter D of the crucible tray is 0.5 or more times an outer diameter D of the straight body portion of the graphite crucible . Minimum thickness of the crucible tray is 15 mm or more.