Birch, Stewart, Kolasch & Birch, LLP
Fan and impeller
A fan includes a housing, an impeller and a motor. The impeller includes a hub, a ring and a plurality of flat blades. The ring surrounds the hub without substantial contact therewith and is connected to the hub by at least one connecting arm. The flat blades are disposed on the ring and the active surface of each flat blade has an imaginary extending lines which is which is tangent to a rim of the hub.
Delta Electronics, Inc.
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Hsiu-Wei Yi-Ling Chieh-Lung
Wu Chen Ho