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The ornamental design for an air duct riser, as shown and described. |
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FIG. 1 is a top plan view of an air duct riser which incorporates our new design;
FIG. 2 is a side elevation view of the air duct riser;
FIG. 3 is a front elevation view of the air duct riser; and,
FIG. 4 is a perspective view of the air duct riser.
The rear of the air duct riser is a mirror image of the front, and the bottom is a mirror image of the top.
Inda, John P., Inda, Joseph J.
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| D423660, | Mar 22 1999 | Air duct boot |
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Feb 05 1993 | General Plastics, Inc. | (assignment on the face of the patent) | / |
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