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:
Sep. 05, 2000
Filed:
Dec. 13, 1995
Applicant:
Inventor:
Koya Ohira, Kuwana, JP;
Assignee:
NTN Corporation, Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16C / ; F16C / ;
U.S. Cl.
CPC ...
384527 ; 384576 ; 384902 ;
Abstract
A rolling bearing for use in a dental hand-piece which can withstand sterilizing temperatures ranging from 135-200 .degree. C., and which can be rotated at a speed of 300000 rpm or higher with a minimum amount of lubricant used. This rolling bearing is used in a hand-piece having a shaft to which a dental rotary cutting tool is detachably mounted, a turbine fixed to the shaft, and a passage for introducing compressed air for driving the turbine. The rolling bearing has a retainer formed by sintering a polyimide resin powder so that it has 5-20% by volume of mutually communicating pores and impregnating the sintered member thus formed with a fluorinated oil.