Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Reexamination Certificate
2011-01-11
2011-01-11
Wiehe, Nathaniel (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
C416S22300B
Reexamination Certificate
active
07866952
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: 265984 (1882-10-01), Schmolz
patent: 1868528 (1932-07-01), Gardner
patent: 2222787 (1940-11-01), Stadler
patent: 2255023 (1941-09-01), Eksergian
patent: 2932360 (1960-04-01), Hungate
patent: 4142844 (1979-03-01), Brattstrom
patent: 5403160 (1995-04-01), You
patent: 5967754 (1999-10-01), Chou
patent: 2005/0147498 (2005-07-01), Chien et al.
Report regarding Office Action in Chinese counterpart patent application, Office action dated Feb. 15, 2008.
Alexanian Vazken
International Business Machines - Corporation
Wiehe Nathaniel
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