Mask valve

The ornamental design for a mask valve, as shown and described.

FIG. 1 is a front perspective view of a mask valve, showing my design.

FIG. 2 is a rear perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the mask valve that form no part of the claimed design.

Patent	Priority	Assignee	Title
ER9520,

Patent	Priority	Assignee	Title
9579540,	Jan 06 2016	CLEVUM OÜ	Resistance breathing device
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20080178884,
20090044811,
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20160129287,
20180078797,
20180264294,
D413166,	Mar 02 1998	Louis M. Gerson Co., Inc.	Face mask breathing valve
D765237,	Nov 04 2015	CLEVUM OÜ	Resistance breathing device
D811580,	May 08 2014	ST ENGINEERING INNOSPARKS PTE LTD ; ST ENGINEERING PTE LTD	Unidirectional valve for face mask
D815273,	Apr 13 2015	COLOPLAST A S	Automatic speaking valve
D877885,	Feb 06 2019		Earless filter mask
D906598,	Jan 15 2020		Mask breather valve

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