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The ornamental design for a "positive displacement pump", substantially as shown and described. |
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FIG. 1 is a perspective view of a positive displacement pump showing our new design;
FIG. 2 is an elevational view taken from one end thereof.
FIG. 3 is an elevational view taken from one side thereof.
FIG. 4 is an elevational view taken from the end opposite that in FIG. 2.
FIG. 5 is a perspective view of a modified form of the positive displacement pump shown in FIG. 1.
FIG. 6 is an elevational view taken from one side of FIG. 5.
FIG. 7 is an elevational view taken from one end of FIG. 5.
FIG. 8 is an elevational view taken from the end opposite that shown in FIG. 7.
Bell, Robert R., Alexander, William H.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 31 1977 | Vapor Corporation | (assignment on the face of the patent) | / |
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