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:
Dec. 24, 1991
Filed:
Mar. 02, 1990
Akihito Fujii, Itami, JP;
Kenichiro Shibata, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A light transmitting yttria sintered body having good light transmission, can be prepared by a method of preparing a light transmitting yttria sintered body which comprises steps of densifying yttria powder having purity of not lower than 99.9% and a BET specific surface area of not smaller than 10 m.sup.2 /g by a hot press at a temperature of 1300.degree. to 1700.degree. C. under a pressure of 100 to 500 kg/cm.sup.2 in a vacuum circumstance so as to achieve the theoretical density ratio of not lower than 95% and then hot isotropically pressing densified yttria at a temperature of 1400.degree. to 1900.degree. C. under a pressure of not lower than 500 kg/cm.sup.2.