Patent
   D565148
Priority
Sep 17 2004
Filed
Apr 25 2006
Issued
Mar 25 2008
Expiry
Mar 25 2022
Assg.orig
Entity
unknown
10
12
n/a
The ornamental design for an underdrain, as shown and described.

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.

Addison, Mark Kevin

Patent Priority Assignee Title
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Patent Priority Assignee Title
3840117,
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5149427, Apr 03 1991 The F.B. Leopold Company, Inc. Cap for underdrains in gravity filters
5160614, Feb 25 1992 ITT WATER & WASTEWATER LEOPOLD, INC Air duct block for air/water underdrain systems in gravity filters
5296138, May 03 1990 Unifilt Corporation Underdrain for liquid purification systems
5328608, May 27 1992 Xylem Water Solutions Zelienople, LLC Mutli-lateral filter underdrain block
5462664, Aug 05 1992 Filter underdrain module and underdrain system
5489388, Apr 12 1994 Xylem Water Solutions Zelienople, LLC Apparatus and method for improving gas backwash in lateral underdrains
5639384, Apr 12 1994 Xylem Water Solutions Zelienople, LLC Apparatus and method for improving gas backwash in lateral underdrains
6143188, Dec 22 1998 SEVERN TRENT WATER PURIFICATION, INC Underdrain block for filter media system
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Apr 25 2006RG Delaware, Inc.(assignment on the face of the patent)
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