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The ornamental design for a track ball, as shown and described. |
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FIG. 1 is a perspective view of a track ball showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is front elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a bottom plan view thereof.
Harden, Daniel, Melzer, Tino, Clouss, Richard
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Oct 30 1991 | Logitech, Inc. | (assignment on the face of the patent) | / | |||
| Nov 04 1991 | CLOUSS, RICHARD | LOGITECH, INC | ASSIGNMENT OF ASSIGNORS INTEREST | 005961 | /0941 | |
| Nov 18 1991 | HARDEN, DANIEL | LOGITECH, INC | ASSIGNMENT OF ASSIGNORS INTEREST | 005961 | /0939 | |
| Dec 10 1991 | MELZER, TINO | LOGITECH, INC | ASSIGNMENT OF ASSIGNORS INTEREST | 005961 | /0937 | |
| Oct 10 2001 | LOGITECH, INC | LOGITECH EUROPE, S A | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 012391 | /0606 |
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