The ornamental design for a portableilluminatedsign, as shown and described.
FIG. 1 is a perspective view of a portable illuminated sign showing my new
embodiment, with a broken line showing for illustrative purposes only and
forming no part of the claimed design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear-end view thereof; and,
FIG. 4 is a right side elevational view thereof, the left side elevational
view being a mirror image of the right side elevational view.