The ornamental design for a ballpointpen, as shown and described.
FIG. 1 is a perspective view of a ballpoint pen showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a side view thereof, the opposite side being a mirror image of that shown;
FIG. 4 is a rear view thereof;
FIG. 5 is an end view thereof;
FIG. 6 is an opposite end view to that shown in FIG. 5;
FIG. 7 is a front view thereof, showing the cap removed and positioned on the end and the writing tip exposed; and,
FIG. 8 is a side view thereof, showing the cap removed and positioned on the end and the writing tip exposed, the opposite side being a mirror image of that shown.