Fan with improved heat dissipation

Details Fan with improved heat dissipation Fan with improved heat dissipation

2008-03-22

2010-10-26

Look, Edward (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Irregular, flanged or channel forming blade surface

Reexamination Certificate

active

07819631

ABSTRACT:
A fan includes a rotatable center member that is centered relative to an axis of rotation of the fan. The fan includes a number of blades radially extending from the rotatable center member. Each blade may have one or more ribs extending therefrom non-parallel to the axis of rotation of the fan. Each blade may be may be flat in shape, except for the ribs extending therefrom, or it may have a cycloidal curvature that curves away from the direction in which the rotatable center member rotates. In addition to or in lieu of the ribs, each blade may have a side profile that is non-linear. The side profile may be a zigzag or a curvy shape. The side profile may have one or more notches pointed in a direction opposite that in which the rotatable center member rotates, or may have one or more holes extending through the blade.

REFERENCES:
patent: 1385908 (1921-07-01), Dunwoody
patent: 2222787 (1940-11-01), Stadler
patent: 2002/0159885 (2002-10-01), Liang et al.
patent: 2003/0017048 (2003-01-01), Lin
patent: 2008/0166239 (2008-07-01), Tanahashi
Report regarding Office Action in Chinese counterpart patent application, Office action dated Feb. 15, 2008.

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