Frame of chair backrest

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

FIG. 1 is a perspective view of frame of chair backrest showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left end view thereof.

FIG. 5 is a right end view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Patent	Priority	Assignee	Title
D708882,	Aug 07 2013	Zhongshan Shi Songlin Furniture Co., Ltd	Chair back frame
D723851,	Jun 07 2013	MILLERKNOLL, INC	Backrest support
D767320,	Jul 17 2015		Chair back
D799254,	Mar 28 2016	EXEMPLIS LLC	Seatback frame
D818294,	Mar 07 2016	Zhongshan Shi Songlin Furniture Co., Ltd.; ZHONGSHAN SHI SONGLIN FURNITURE CO , LTD	Chair back frame
D826614,	May 26 2017	Hongliang, Chu	Back rest for chair

Patent	Priority	Assignee	Title
D573817,	Sep 07 2007		Chair backrest
D574645,	May 02 2007	Dynamic Office Chair Company, Ltd.	Chair back
D580199,	Jul 02 2008		Chair backrest
D594257,	Dec 02 2008	Dynamic Office Chair Company, Ltd.	Chair back
D596884,	Dec 23 2008	Hurng Taih Plastic Master Batch Co., Ltd.	Chair back frame
D648968,	Feb 07 2011	PRO-CORD S P A	Chair
D652223,	Oct 09 2008	Okamura Corporation	Chair
D652646,	Oct 09 2008	Okamura Corporation	Chair

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