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:
Oct. 31, 2000
Filed:
Oct. 29, 1999
Applicant:
Inventor:
Teruo Izumi, Hyogo pref., JP;
Assignee:
Sumitomo Sitix Corporation, Amagasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
C30B / ;
U.S. Cl.
CPC ...
117200 ; 4233281 ; 117911 ;
Abstract
When a pulled single crystal becomes heavier, the strength of a seed crystal holder made of a carbon material is not sufficient, leading to falling of the single crystal. On the other hand, a seed crystal holder made of metal causes heavy metal contamination, or the strength thereof deteriorates early because of thermal fatigue. Accordingly, a seed crystal holder, comprising an inner cylindrical body made of metal which directly holds a seed crystal, and a carbon cylindrical body arranged around the inner cylindrical body which covers the periphery thereof, is used.