The ornamental design for a portablecompressor, as shown and described.
FIG. 1 is a front and top perspective view of a portable compressor in accordance with a preferred embodiment of my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines in the figures are for illustrating environmental structure only and form no part of the claimed design.
The bottom view of the portable compressor is not shown in the drawings or described in the specification, and therefore, forms no part of the claimed design.