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. 28, 2004
Filed:
Nov. 14, 2001
Applicant:
Inventors:
Assignee:
Shin Etsu Quartz Products Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B 1/510 ;
U.S. Cl.
CPC ...
C30B 1/510 ;
Abstract
Provided are a quartz glass crucible for pulling up a silicon single crystal, with which not only a defectless silicon single crystal can be pulled but a single crystallization ratio can greatly be improved and a production method therefor. The quartz glass crucible comprises a crucible body constituted of a semi-transparent quartz glass layer and a transparent quartz glass layer formed on the inner wall surface of the crucible bass body and no expanded bubbles equal to ro more than 0.5 mm in diameter are present in a layer 1 mm in depth from an inner surface of the quartz glass crucible after the silicon single crystal is pulled up using the quartz glass crucible.