Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 12, 2018
Patent Application Number
13912922
Date Filed
June 7, 2013
Patent Citations Received
Patent Primary Examiner
Patent abstract
A centrifugal fan includes an impeller. The impeller includes a hub, a plurality of connecting structures, an annular structure and a plurality of blades. The hub includes a circumferential surface. The connecting structures are disposed on the circumferential surface of the hub at intervals. Any adjacent two of the connecting structures define a first minimum distance on the circumferential surface. At least two first minimum distances are not equal. The annular structure is connected to the connecting structures. The blades are disposed on the annular structure at intervals.
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