Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hirofumi Shoji0
Date of Patent
January 12, 2016
0Patent Application Number
133249000
Date Filed
December 13, 2011
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An impeller structure for a centrifugal fan apparatus includes a circular back plate, a ring-shaped shroud, and a tubular hub. The ring-shaped shroud and the tubular hub are respectively located a predetermined distance above and at the center of said circular back plate. The impeller structure further includes a plurality of blades which are annularly disposed around the tubular hub between the circular back plate and the ring-shaped shroud. Each of the plurality of blades includes a chord with a logarithmic spiral shape, and a mean camber line with an angle of return against the chord.
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