Ballback chair backrest

The ornamental design for a ballback chair backrest, as shown and described.

FIG. 1: is a perspective view of the ballback chair backrest

FIG. 2: is a left, side view of the ballback chair backrest

FIG. 3: is a right, side view of the ballback chair backrest

FIG. 4: is a front view of the ballback chair backrest

FIG. 5: is a back view of the ballback chair backrest

FIG. 6: is a top view of the ballback chair backrest; and,

FIG. 7: is a bottom view of the ballback chair backrest.

Inventor's ballback chair backrest is characterized by a backrest attached to an arm connecting the backrest to a chair's main body.

Patent	Priority	Assignee	Title
10368647,	Nov 16 2015		Backrest for a seating device

Patent	Priority	Assignee	Title
3964790,	Feb 11 1975		Ball furniture
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6702388,	Jun 04 2003	FAMOSA CORP	Ball chair with a securing device
6832817,	Feb 19 2004	FASMOSA CORP	Ball chair
7044558,	Jun 04 2003	FAMOSA CORP	Ball chair with a retaining device
7140677,	Jan 10 2006		Ball chair
8721005,	Sep 06 2011	MANKIN, MARIA	Collapsible chair
D577229,	Nov 30 2007	Back Quality USA	Chair
D644849,	May 14 2010	Grand Rapids Chair Company	Chair
D679916,	Aug 29 2012	SEQUENTIAL HOLDCO LLC	Chair for an exercise ball

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