Folding knife

[0001]FIG. 1 is a perspective view of a folding knife showing my new design;

[0002]FIG. 2 is another perspective view thereof;

[0003]FIG. 3 is a front view thereof;

[0004]FIG. 4 is a back view thereof;

[0005]FIG. 5 is a left view thereof;

[0006]FIG. 6 is a right view thereof;

[0007]FIG. 7 is an enlarged top plan view thereof; and,

[0008]FIG. 8 is an enlarged bottom plan view thereof.

[0009]The broken lines depict portions of the folding knife and form no part of the claimed design.