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The ornamental design for an underdrain, as shown and described.
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FIG. 1 is a plan view of my underdrain;
FIG. 2 is a bottom view of the apparatus depicted in FIG. 1.
FIG. 3 is a front elevation view of the apparatus depicted in FIG. 1.
FIG. 4 is a rear elevation view of the apparatus depicted in FIG. 1.
FIG. 5 is a right side view of the apparatus depicted in FIG. 1; and,
FIG. 6 is a left side view of the apparatus depicted in FIG. 1.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Sep 09 2002 | ADDISON, MARK KEVIN | RG DELAWARE, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015809 | /0867 | |
| Sep 17 2004 | RG Delaware, Inc. | (assignment on the face of the patent) | / |
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