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. 30, 2000
Filed:
Jun. 10, 1998
Applicant:
Inventors:
Assignee:
Nippon Shokubai Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01G / ; C01B / ; B01J / ; B01J / ;
U.S. Cl.
CPC ...
423608 ; 501103 ; 502105 ; 502349 ; 502351 ;
Abstract
A zirconia powder has an average particle diameter in a range from larger than 0.5 .mu.m to 0.8 .mu.m, and particles of 90 volume percent of the zirconia powder having a diameter of 1.5 .mu.m or smaller. Using this zirconia powder, a zirconia ceramics having uniform quality can be produced. The zirconia powder of the present invention can be efficiently produced by wet-milling a raw material powder using balls under a condition satisfying the following mathematical relation (I):