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. 26, 2009
Filed:
Feb. 16, 2007
Applicants:
Koji Tsukuma, Sagamihara, JP;
Isao Yamashita, Odawara, JP;
Inventors:
Koji Tsukuma, Sagamihara, JP;
Isao Yamashita, Odawara, JP;
Assignee:
Tosoh Corporation, Shunan-Shi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B 35/486 (2006.01);
U.S. Cl.
CPC ...
Abstract
A primary sintered body having a density of 95 % or more obtained by sintering a zirconia powder comprising an yttria main component as a stabilizer under ordinary pressure is set in a vessel of a semi-sealed state and subjected to HIP treatment (secondary sintering) at a temperature of from 1,600 to 1,900° C. under a pressure of 50 MPa or higher, and according to need, heated treated in an oxidizing atmosphere, thereby producing a polycrystalline sintered body of zirconia having high transparency of an in-line transmission of 50% or higher.