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:
Nov. 13, 2001
Filed:
Mar. 03, 2000
Applicant:
Inventor:
Tomonori Niwa, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16C 3/332 ;
U.S. Cl.
CPC ...
F16C 3/332 ;
Abstract
A ceramic bearing ball capable of preventing irregular vibrations of, for example, a hard disk drive and having a high accuracy. The ceramic ball is characterized as having a sphericity of not more than 0.08 &mgr;m, a surface roughness of not more than 0.012 &mgr;m and a maximum surface pore size of 5 &mgr;m.