We claim the ornamental design for an inflatable cushion, as shown and described.
FIG. 1 is a perspective view of an inflatable cushion, showing our new design in a flat configuration;
FIG. 2 is an exploded perspective view of FIG. 1;
FIG. 3 is an exploded rear elevational view of FIG. 1;
FIG. 4 is an exploded front elevational view of FIG. 1;
FIG. 5 is an exploded right-side elevational view of FIG. 1;
FIG. 6 is an exploded left-side elevational view of FIG. 1;
FIG. 7 is an exploded top plan view of FIG. 1;
FIG. 8 is an exploded bottom plan view of FIG. 1; and,
FIG. 9 is a perspective view of the inflatable cushion, illustrated in a seat-configuration.
The broken lines showing a person in FIG. 9 depict environmental matter that forms no part of the claimed design. It is understood that the front elevational view, rear elevational view, and bottom plan view of the inflatable cushion are identical.