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. 16, 2001
Filed:
Mar. 16, 1999
Applicant:
Inventors:
Hiroyuki Kawanaka, Yokohama, JP;
Tsuguo Fukuda, Sendai, JP;
Assignee:
Victor Company of Japan, Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 5/5495 ; H01L 4/118 ;
U.S. Cl.
CPC ...
C04B 5/5495 ; H01L 4/118 ;
Abstract
A melt containing lanthanum oxide, tantalum oxide, and gallium oxide is prepared by mixing the powders of these oxides so as to have a stoichiometric composition ratio of an intended lanthanum/tantalum/gallium oxide to be manufactured. A crystal is pulled up from the melt in an atmosphere containing argon and oxygen according to the Czochralski process. The concentration of the oxygen is in a range from 0.1 vol % to 1.5 vol % with respect to the concentration of the argon.