Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 24, 2012
Patent Application Number
11937403
Date Filed
November 8, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
An impeller (10) for a cooling fan includes a hub (20) having a circular wall (22) and an annular sidewall (24) extending upwardly from a periphery of the circular wall, and a plurality of blades (30) extending radially from the sidewall of the hub. Each of the blades includes a first portion (32) near the hub and a second portion (34) away from the hub, wherein each of the second portions has a pair of opposite ribs (36) formed on two lateral sides thereof, thereby reducing a noise level generated by the impeller when the impeller rotates.
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