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The ornamental design for a protective helmet, as shown and described. |
FIG. 1 is a top, front and side perspective view of a protective helmet showing my new design;
FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a rear elevational view thereof.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Aug 17 1989 | BLOME, WILLI | FIRMA KARL SCHEFFER-KLUTE GMBH & CO | ASSIGNMENT OF ASSIGNORS INTEREST | 005116 | /0895 | |
Aug 29 1989 | Firma Karl Scheffer-Klute GmbH & Co. | (assignment on the face of the patent) | / |
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