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The ornamental design for an air purifier, as shown and described.
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The broken lines in the drawings illustrate the portions of the air purifier which form no part of the claimed design.
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Jan 25 2021 | YAN, YIQING | SHENZHEN PUREMATE TECHNOLOGY CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 055172 | /0845 | |
Feb 07 2021 | SHENZHEN PUREMATE TECHNOLOGY CO., LTD. | (assignment on the face of the patent) | / |
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