Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Keisuke Oishi0
Seiji Nakashima0
Yoshiki Sato0
Date of Patent
September 3, 2019
0Patent Application Number
155070130
Date Filed
October 30, 2014
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A turbofan includes a boss rotatable about an axis, a main plate connected to the boss, a shroud having an intake hole, and a plurality of blades arranged between the main plate and the shroud. An undulating protrusion portion is arranged at a front edge portion of each blade. The undulating protrusion portion includes a plurality of protrusions. The pitches of the plurality of protrusions are formed so as to become smaller as approaching to the main plate side.
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