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:
Mar. 15, 2016
Filed:
Nov. 30, 2011
Toshiaki Sudo, Akita, JP;
Takuma Yoshioka, Akita, JP;
Koichi Suzuki, Akita, JP;
Shinsuke Yamazaki, Akita, JP;
Toshiaki Sudo, Akita, JP;
Takuma Yoshioka, Akita, JP;
Koichi Suzuki, Akita, JP;
Shinsuke Yamazaki, Akita, JP;
SUMCO CORPORATION, Tokyo, JP;
Abstract
The present invention provides a method of manufacturing a vitreous silica crucible having a transparent layer by use of waste vitreous silica, and silica powder suitable for the manufacturing. According to the present invention, there is provided a method of manufacturing granulated silica powder comprising a process for pulverizing waste vitreous silica generated in the manufacturing process of a crucible to form silica fine powder having an average particle diameter of 100 μm or less, and a process for granulating the silica fine powder to obtain granulated silica powder having an average particle diameter of 50 μm or more under helium atmosphere.