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The ornamental design for a helicopter, as shown. |
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FIG. 1 is a left side perspective view of a helicopter showing our new design;
FIG. 2 is a front and right side perspective view thereof;
FIG. 3 is a front perspective view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a left side elevational view thereof; and,
FIG. 6 is a right side elevational view thereof.
Alber, Mark R., Harper, William H.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Aug 20 1991 | United Technologies Corporation | (assignment on the face of the patent) | / | |||
| Sep 16 1991 | HARPER, WILLIAM H | United Technologies Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 005850 | /0975 | |
| Sep 17 1991 | ALBER, MARK R | United Technologies Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 005850 | /0975 | |
| Oct 16 1991 | UNITED TECHNOLOGIES CORPORATION SIKORSKY AIRCRAFT | ARMY, UNITED STATES GOVERNMENT, SECRETARY OF THE ARMY | CONFIRMATORY LICENSE SEE DOCUMENT FOR DETAILS | 008615 | /0104 |
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