FIG. 1 is a perspective view of a first embodiment of a utility knife showing our new design;
FIG. 2 is a front plan view of the utility knife of FIG. 1;
FIG. 3 is a left side plan view thereof;
FIG. 4 is a right side plan view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a rear plan view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is a perspective view of a second embodiment of a utility knife showing our new design;
FIG. 10 is a front plan view of the utility knife of FIG. 9;
FIG. 11 is a left side plan view thereof;
FIG. 12 is a right side plan view thereof;
FIG. 13 is a top plan view thereof;
FIG. 14 is a bottom plan view thereof;
FIG. 15 is a rear plan view thereof;
FIG. 16 is a rear perspective view thereof;
FIG. 17 is a perspective view of a third embodiment of a utility knife showing our new design;
FIG. 18 is a front plan view of the utility knife of FIG. 17;
FIG. 19 is a left side plan view thereof;
FIG. 20 is a right side plan view thereof;
FIG. 21 is a top plan view thereof;
FIG. 22 is a bottom plan view thereof;
FIG. 23 is a rear plan view thereof;
FIG. 24 is a rear perspective view thereof;
FIG. 25 is a perspective view of a fourth embodiment of a utility knife showing our new design;
FIG. 26 is a front plan view of the utility knife of FIG. 25;
FIG. 27 is a left side plan view thereof;
FIG. 28 is a right side plan view thereof;
FIG. 29 is a top plan view thereof;
FIG. 30 is a bottom plan view thereof;
FIG. 31 is a rear plan view thereof; and,
FIG. 32 is a rear perspective view thereof.
The broken lines in the drawings show structure that is not part of the claimed design, but rather show the environment in which the design is associated, or show portions of the article in which the design is embodied or applied to that are not considered part of the claimed design.