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, 1993
Filed:
Feb. 26, 1991
Abstract
A hand-held sand blasting device, which is particularly useful for treating mall surface areas, such as tooth faces in situ, includes a sand cartridge 20 adapted to be placed in a handle portion 10 of the device and rewardly sealed by a piston 34 which is adapted to be advanced by pressurized air. Part of the pressurized air flows along a longitudinal groove 25 formed in a wall of the handle portion 10 externally of the cartridge 20 and enters the cartridge through an opening 27 provided at a front portion thereof, where the relatively large cross-section of the main portion of the cartridge converges to the substantially smaller cross-section of a feed channel 28. The fine sand 21 is thus fluidized in this area and maintained flowable. Through the feed channel 28, the sand is supplied to a mixing chamber 30 where it is mixed with pressurized air and discharged through a nozzle pipe 33.