I claim the ornamental design for a cutting blade, as shown and described.
FIG. 1 is a perspective view of a cutting blade in accordance with the present invention;
FIG. 2 is a top plan view of the cutting blade of FIG. 1, in accordance with the present invention;
FIG. 3 is a bottom plan view of the cutting blade of FIG. 1, in accordance with the present invention;
FIG. 4 is a left side elevational view of the cutting blade of FIG. 1, in accordance with the present invention;
FIG. 5 is a right side elevational view of the cutting blade of FIG. 1, in accordance with the present invention;
FIG. 6 is a front view of the cutting blade of FIG. 1, in accordance with the present invention; and,
FIG. 7 is a rear view of the cutting blade of FIG. 1, in accordance with the present invention.
The broken lines shown in the drawings are included for purposes of illustrating portions of the cutting blade and form no part of the claimed design. The surface shading lines show contour and/or distinguish between open and solid areas. The surface shading lines are not surface ornamentation.