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The ornamental design for a chair back, as shown and described.
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FIG. 1 is a perspective view of a chair back showing my new design;
FIG. 2 is a front side elevational view thereof;
FIG. 3 is a rear side elevational view thereof;
FIG. 4 is a left side elevational view thereof,
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 20 2004 | PAN, TOUNG-CHUN | OASYSCHAIR CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 016151 | /0848 | |
| Dec 29 2004 | Oasyschair Co., Ltd. | (assignment on the face of the patent) | / |
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