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, 2024
Filed:
Oct. 30, 2020
Sumco Corporation, Tokyo, JP;
Toshiyuki Nakao, Akita, JP;
Hiroshi Kishi, Akita, JP;
Kouta Hasebe, Akita, JP;
Hideki Fujiwara, Tokyo, JP;
SUMCO CORPORATION, Tokyo, JP;
Abstract
A quartz glass crucible () includes: a crucible body () made of silica glass; and a crystallization-accelerator-containing layer () formed on an outer surface of the crucible body (). A concentration of a crystallization accelerator contained in the crystallization-accelerator-containing layer () is 1.0×10atoms/cmor more and 4.8×10atoms/cmor less. The quarts glass crucible is intended to be capable of not only enduring a single crystal pulling-up process that takes a very long time, such as multi-pulling, but also stably controlling the oxygen concentration and crystal diameter of a silicon single crystal by eliminating a gap between the carbon susceptor and the crucible as much as possible.