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. 02, 2012
Filed:
Apr. 27, 2011
Toshiaki Sudo, Akita, JP;
Hiroshi Kishi, Akita, JP;
Kouta Hasebe, Akita, JP;
Japan Super Quartz Corporation, Akita, JP;
Abstract
Provided is a method of manufacturing a vitreous silica crucible, including: an arc fusing process for fusing the silica powder molded body by using arc flames generated from the plurality of carbon electrodes, wherein the arc fusing process is performed in a state of disposing tips of at least a pair of carbon electrodes of the plurality of carbon electrodes closer to a target surface of the silica powder molded body than other carbon electrode tips, and setting distances from each of the tips of the closer carbon electrodes to the target surface, to be equal, and the arc fusing process is performed by heating and fusing the silica powder molded body while performing fire polishing, which partially removes an inner surface of the silica powder molded body by using arc flames generated by the closer carbon electrodes.