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:
Apr. 06, 2004
Filed:
Apr. 20, 2001
Applicant:
Inventors:
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
C04B 4/187 ;
U.S. Cl.
CPC ...
C04B 4/187 ;
Abstract
An alumina sintered compact includes at least two layers including an internal layer and a surface layer formed on the surface of the internal layer, which internal layer is composed of alumina crystal grains formed by sintering of a fine alumina powder, and which surface layer is composed of alumina crystal grains formed by grain growth of a fine alumina powder and having a mean grain size larger than that of the alumina crystal grains of the internal layer. This alumina sintered compact can prevent the accumulation of PbO in a surface area while controlling the absorption of PbO.
Hirako, Koichiro. (2004). Alumina sintered compact and method of producing the same, and article for heat treatment using alumina sintered compact (U.S. Patent No. 6716517). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6716517
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile