The ornamental design for a utilityknife handle, as shown and described.
FIG. 1 is a front perspective view of the utility knife handle of the present invention showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is an opposite side elevational view thereof;
FIG. 4 is a back elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a back perspective view of the utility knife handle of the present invention.
The broken lines illustrating a blade holder are directed to environment and form no part of the claim. All other broken lines in the drawings illustrate unclaimed features of the handle.