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			 The ornamental design for an air purifier, as shown and described. 
			  
			  
			  
			  
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FIG. 1 is a top, front, right-side perspective view of an air purifier showing my new design;
FIG. 2 is a top, left-side rear perspective view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a front elevational view thereof, the bottom, not seen in use, being plain and unornamented.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| May 03 2005 | De'Longhi S.p.A. | (assignment on the face of the patent) | / | |||
| Jul 20 2005 | DE LONGHI, GIUSEPPE | DE LONGHI S P A | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 016816 | /0860 | 
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