Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hsi-Huang Lai0
Hsi-Hur Lai0
Date of Patent
March 30, 2010
Patent Application Number
11131470
Date Filed
May 18, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
This invention is a new structure of blackboard eraser with cordless vacuum functionality. The main components in the design include a chalk eraser, chalk dust collector and vacuum fan. A brusher mounted in the edge of inlet hole of chalk dust collector removes the chalk dust from the surface of eraser belt shape fabric and then the chalk dust is vacuumed into the collector chamber by vacuum fan. The roller shafts are inserted to the eraser bracket side holes and then go to the center of cylinder rollers.
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