The ornamental design for a penholder, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawings will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a side perspective view of a pen holder showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a side elevational view thereof in condition of use.
The hazed representations of writing instruments in the drawings form no part of the claimed design.