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:
Jan. 13, 1987
Filed:
Mar. 18, 1983
Applicant:
Inventors:
Isamu Fukuura, Aichi, JP;
Shigeo Niwa, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61F / ;
U.S. Cl.
CPC ...
623 18 ; 623 16 ;
Abstract
An artificial articulation includes a socket which has a spherical inner surface, a bone head ball member which is pivotably, slidably received in the spherical inner surface of the socket, and a stem which is connected to the ball head bone member. The socket is made of polycrystal alumina porcelain, the bone head ball member is made of dense silicon nitride porcelain, and the stem is made of either silicon nitride porcelain or partially stabilized zirconia porcelain. An outer surface of the stem and outer surface of the socket are coated with first and second cover layer.