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:
May. 20, 2003
Filed:
Jul. 02, 2001
Toshihisa Yokoyama, Nagoya, JP;
Masahiro Murasato, Nagoya, JP;
Katsuhiro Imai, Nagoya, JP;
Minoru Imaeda, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
In a process for producing a planar body of an oxide single crystal with a &mgr; pulling-down method, a shoulder portion having a larger width is grown without any polycrystal regions, cracks or crystal deteriorations in a central portion of the planar body. A raw material of the oxide single crystal is melted in a crucible. A seed crystal is contacted to a melt of the raw material near an opening of a nozzle of the crucible. Then, the melt is drawn from the opening by pulling down the seed crystal to form a planar body A. A temperature distribution of the nozzle in a direction perpendicular to the drawing direction B is controlled by supplying heat to the nozzle and/or by removing heat from the nozzle