The ornamental design for a lightweightportableheatingdevice, showing our new design, as shown and described.
This invention was made with government support under W911QY-18-9-0017 awarded by U.S. Department of the Army. The government has certain rights in the invention.
FIG. 1 is a top, front, and right side perspective view of a lightweight portable heating device showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines shown in the drawings are for the purpose of illustrating portions of the lightweight portable heating device and form no part of the claimed design.