US D490621 S1
FIG. 1 is a perspective view of the ornamental design for an office chair according to the invention.
FIG. 2 is a rear perspective view thereof.
FIG. 3 is a left side elevational view, of which the right side view is a mirror image thereof.
FIG. 4 is a front elevational view thereof.
FIG. 5 is a rear elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.