The ornamental design for a patiocooler, as shown and described.
FIG. 1 is a perspective view of a patio cooler in accordance with the invention;
FIG. 2 is a left side elevation of the patio cooler of FIG. 1;
FIG. 3 is a right side elevation of the patio cooler of FIG. 1;
FIG. 4 is a front elevation of the patio cooler of FIG. 1;
FIG. 5 is a rear elevation of the patio cooler of FIG. 1;
FIG. 6 is a top plan view of the patio cooler of FIG. 1; and,
FIG. 7 is a bottom view of the patio cooler of FIG. 1.
Broken lines are used in the Drawings to denote certain subject matter, for example, environmental structure or boundaries, that are for illustrative purposes only and form no part of the claimed design.