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The ornamental design for a ball valve, as shown and described. |
FIG. 1 is a perspective view of a first embodiment of a ball valve in accordance with the present invention;
FIG. 2 is a bottom view of the ball cock of FIG. 1;
FIG. 3 is a front view of the ball cock of FIG. 1;
FIG. 4 is a top view of the ball cock of FIG. 1;
FIG. 5 is a rear view of the ball cock of FIG. 1;
FIG. 6 is a left view of the ball cock of FIG. 1 ; and,
FIG. 7 is a right view of the ball cock of FIG. 1.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
May 31 1995 | Georg Fischer Rohrleitungssysteme AG | (assignment on the face of the patent) | / |
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