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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 depict portions of the air purifier which form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Sep 03 2018 | CHAN, CHI KEUNG RUDY | RHT Limited | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 046822 | /0542 | |
| Sep 07 2018 | RHT Limited | (assignment on the face of the patent) | / | 
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