The ornamental design for a ballpointpen, as shown and described.
FIG. 1 is a top view of a ballpoint pen of the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a partial front view of the top portion of the ballpoint pen with a section of the pen clip rotated to the right shown without the lower part and enlarged for clarity;
FIG. 8 is a partial left side view of the top portion of the ballpoint pen with a section of the pen clip rotated to the right shown without the lower part and enlarged for clarity; and,
FIG. 9 is a partial rear view of the top portion of the ballpoint pen with a section of the pen clip rotated to the right shown without the lower part and enlarged for clarity.
The broken lines in FIGS. 7, 8 and 9 are included to show the broken away edges of the partial figures and features on the back of the clip that form no part of the claimed design.