Heat dissipation device

FIG. 1 is a front, right and bottom perspective view of a heat dissipation device showing our new design;

FIG. 2 is a rear, left and top perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is an enlarged view of an encircled portion 9 of FIG. 1 ;

FIG. 10 is an enlarged view of an encircled portion 10 of FIG. 1 ;

FIG. 11 is an enlarged view of an encircled portion 11 of FIG. 2 ; and,

FIG. 12 is an enlarged view of an encircled portion 12 of FIG. 1 .

The broken lines depict portions of the heat dissipation device in which the design is embodied that form no part of the claimed design. The dash-dot lines illustrate the bounds of the enlarged views and form no part of the claimed design.