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The ornamental design for an air purifier, as shown and described.
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The broken lines depict portions of the air purifier in which the design is embodied that form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Sep 14 2020 | YU, HUA | 720 BEIJING HEALTH TECHNOLOGY CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 053837 | /0163 | |
| Sep 22 2020 | 720 (BEIJING) HEALTH TECHNOLOGY CO., LTD | (assignment on the face of the patent) | / |
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