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The ornamental design for an air purifier, as shown and described.
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The broken line illustrations in the drawings depict portions of the air purifier that form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 19 2021 | YU, HUA | QIERLING BEIJING HEALTH TECHNOLOGY CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 055043 | /0760 | |
| Jan 27 2021 | QIERLING (BEIJING) HEALTH TECHNOLOGY CO., LTD. | (assignment on the face of the patent) | / |
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