Protective helmet

Description

FIG. 1 is a perspective view of the new, original, and ornamental design of a protective helmet;

FIG. 2 is a rear view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a top view thereof.

The equal-length broken lines and the halftone area enclosed therebetween in FIG. 4 depict portions of the protective helmet that form no part of the claimed design.

Claims

The ornamental design for a protective helmet as shown and described.