Filter key device
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The broken line showing of various features of the filter key device form no part of the claimed design.
The broken line showing of various features of the filter key device form no part of the claimed design.
Claims
The ornamental design of a filter key device, as shown and described.
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Type: Grant
Filed: Nov 1, 2018
Date of Patent: May 19, 2020
Assignee: NINGBO YINZHOU BI CHUN WATER PURIFICATION TECHNOLOGY LIMITED COMPANY (Zhejiang)
Inventor: Matthew Stein (Truckee, CA)
Primary Examiner: Khawaja Anwar
Application Number: 29/668,772