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:
Nov. 02, 2021
Filed:
Aug. 24, 2017
Sumco Corporation, Tokyo, JP;
Hiroshi Kishi, Akita, JP;
Kouta Hasebe, Akita, JP;
Takahiro Abe, Tokyo, JP;
Hideki Fujiwara, Tokyo, JP;
SUMCO CORPORATION, Tokyo, JP;
Abstract
In an exemplary embodiment, a quartz glass crucibleincludes: a cylindrical crucible bodywhich has a bottom and is made of quartz glass; and a first crystallization-accelerator-containing coating filmA which is formed on an inner surfaceso as to cause an inner crystal layer composed of an aggregate of dome-shaped or columnar crystal grains to be formed on a surface-layer portion of the inner surfaceof the crucible bodyby heating during a step of pulling up the silicon single crystal by a Czochralski method. The quartz glass crucible is capable of withstanding a single crystal pull-up step undertaken for a very long period of time.