Oxygen concentrator

FIG. 1 is a front elevation view of an oxygen concentrator showing the new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front, top, left perspective view thereof;

FIG. 8 is a front, top, right perspective view thereof;

FIG. 9 is a front, bottom, left perspective view thereof;

FIG. 10 is a front, bottom, right perspective view thereof;

FIG. 11 is a rear, top, right perspective view thereof;

FIG. 12 is a rear, top, left perspective view thereof;

FIG. 13 is a rear, bottom, right perspective view thereof; and,

FIG. 14 is a rear, bottom, left perspective view thereof.

The dash-dash, broken lines illustrate portions of the oxygen concentrator that form no part of the claimed design.