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:
Aug. 10, 2004
Filed:
Apr. 09, 2002
Yu Long Wang, An Zhen Xi Li Beijing, CN;
Other;
Abstract
An apparatus and method for collecting dust is disclosed. Preferably, the dust to be collected is chalk dust. The apparatus includes a housing supporting an eraser head and having a cavity in fluid communication with a suction device. Interposed between the cavity and the suction device is a collection chamber assembly. A matrix of apertures in the front wall are selectively openable and closeable by a controller in response to the orientation of the eraser. When the eraser is moved across a chalkboard to create airborne chalk dust, the apertures are selectively opened by the controller, the suction device urging the airborne chalk dust through the apertures, through the cavity, and into the collection chamber assembly where it is filtered and stored. The method includes the steps of providing the apparatus of the invention, energizing the suction device, and moving the eraser across a chalkboard to collect chalk dust.