US Patent 7473025 Mixing impeller with spiral leading edge

Patent 7473025 was granted and assigned to SPX Corporation on January, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

SPX Corporation

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7473025

Date of Patent

January 6, 2009

Patent Application Number

12023709

Date Filed

January 31, 2008

Patent Primary Examiner

‌

Charles E. Cooley

Patent abstract

An impeller blade has a flat central disk portion, at least a pair of extensions extending from a central disk portion, and at least two leading edges defined by the outer periphery of the disk portion. Each leading edge spans from one extension to an adjacent extension, and each leading edge has at least a portion at which the radius of the leading edge from the center increases to form a continuous increasing radius curve. Each leading edge forms an increasing radius spiral edge surface in between the extensions.