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			 The ornamental design for an air purifier, as shown and described. 
			  
			  
			  
			  
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The broken lines in the figures illustrating portions of the air purifier are for environmental purposes only and form no part of the claimed design.
The dot-dash broken lines encircling enlargement portions of the design form no part of the claimed design.
Shin, Young-Sun, Park, Jin-Sun
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Jun 14 2015 | SHIN, YOUNG-SUN | SAMSUNG ELECTRONICS CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 036414 | /0528 | |
| Jun 14 2015 | PARK, JIN-SUN | SAMSUNG ELECTRONICS CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 036414 | /0528 | |
| Jun 26 2015 | Samsung Electronics Co., Ltd | (assignment on the face of the patent) | / | 
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