Patent Publication Number: US-D421540-S

Title: Chair back

Description:
FIG. 1 is a front perspective view of our chair back design; 
     FIG. 2 is a rear perspective view of the chair back design shown in FIG. 1; 
     FIG. 3 is a left side perspective view of the chair back design shown in FIG. 1; 
     FIG. 4 is a right side view of the chair back design shown in FIG. 1; 
     FIG. 5 is a front view of the chair back design shown in FIG. 1; 
     FIG. 6 is a left side view of the chair back design shown in FIG. 1; 
     FIG. 7 is a rear view of the chair back design shown in FIG. 1; and, 
     FIG. 8 is a top view of the chair back design shown in FIG. 1. 
     The broken lines shown in FIG. 1 are for illustrative purposes only and form no part of the claimed design.