FIG. 1 is a front elevational view of a utility knife blade showing our new design, the rear elevational view being identical;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view being identical;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view of a second embodiment of a utility knife blade showing our new design, the rear elevational view being identical;

FIG. 6 is a top plan view thereof;

FIG. 7 is a left side elevational view thereof, the right side elevational view being identical;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front elevational view of a third embodiment of a utility knife blade showing our new design, the rear elevational view being identical;

FIG. 10 is a top plan view thereof;

FIG. 11 is a left side elevational view thereof, the right side elevational view being identical;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a front elevational view of a fourth embodiment of a utility knife blade showing our new design, the rear elevational view being identical;

FIG. 14 is a top plan view thereof;

FIG. 15 is a left side elevational view thereof, the right side elevational view being identical; and,

FIG. 16 is a bottom plan 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.