The ornamental design for a respiratorymask, as shown and described.
FIG. 1 is a perspective view of a respiratory mask according to the present invention;
FIG. 2 is a left side elevational view thereof, the right side being a mirror image of the left side;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side elevational view of an alternative embodiment of the respiratory mask, the right side elevational view of the alternative embodiment being a mirror image of the left side elevational view of the alternative embodiment; and,
FIG. 8 is a top plan view of the alternative embodiment.