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:
Jun. 19, 1990
Filed:
Dec. 01, 1988
Akira Uchikawa, Takefu, JP;
Atsushi Iwasaki, Takefu, JP;
Toshio Fukuoka, Sabae, JP;
Mitsuo Matsumura, Takefu, JP;
Hiroshi Matsui, Takefu, JP;
Yasuhiko Sato, Annaka, JP;
Masaaki Aoyama, Kouriyama, JP;
Eiichi Shinomiya, Tokyo, JP;
Akira Fujinoki, Kouriyama, JP;
Nobuyoshi Ogino, Musashino, JP;
Shin-Etsu Handotai Company, Limited, Tokyo, JP;
Shin-Etsu Quartz Products Co., Ltd., Tokyo, JP;
Abstract
A quartz glass crucible adapted for use in a process for pulling a single crystal semiconductor material having an opaque outer substrate of a quartz glass with a relatively high bubble content and an inner transparent glass layer which is substantially free from bubbles. The crucible is produced while the substrate is supported by a rotating mould by forming an atmosphere of high temperature gas and supplying a metered quantity of powders of quartz to the high temperature gas atmosphere to have the quartz powders molten at least partly and directed toward an inner surface of the substrate to be adhered thereon.