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:
Jun. 13, 1995
Filed:
May. 17, 1994
Takasuke Nakanishi, Kanuma, JP;
Nakanishi Dental Mfg. Co., Ltd., Tochigi, JP;
Abstract
A dental handpiece contains a sleeve for rotatably accommodating and securing a dental treatment tool therein, bearings for rotatably holding the sleeve with respect to stationary handpiece casing members, a rotatable rotor fixed to the sleeve for rotating the sleeve under action of a compressed fluid, and stationary convexed and concave protective members for sheathing the bearings exposed to an annular spacing defined by the bearings and the rotatable rotor. The rotatable rotor contains rotatable concave and convexed disc portions. The rotatable concave and convexed disc portions are arranged in proximity to the stationary convexed and concave protective members in a mating relation therewith for defining therebetween at least a first gap and a second gap communicating with the first gap and disposed radially outwardly of the first gap.