Inflatable Mattress

FIG. 1 is a top, front and right side perspective view of an inflatable mattress showing our new design; FIG. 2 is a bottom, rear and left side perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; and, FIG. 9 is an enlarged view of portion 9 in FIG. 1 . The dash-dash broken lines in the drawings illustrate portions of the inflatable mattress which form no part of the claimed design. The dot-dash broken lines in FIGS. 1 and 9 depict boundary lines of the enlargement views and form no part of the claimed design.