US D597664 S1
The ornamental design for a sanitary napkin, as shown and described.
FIG. 1 is a top plan view of a sanitary napkin according to a first embodiment of the present invention; and,
FIG. 2 is a bottom plan view of the sanitary napkin shown in FIG. 1.
Side views of the sanitary napkin have been omitted since the sanitary napkin is flat and devoid of ornamentation.
The broken lines and areas within them in the FIG. 2 view depict portions of the sanitary napkin that form no part of the claimed design.