Underdrain

Skip to: Description  ·  Claims  ·  References Cited  · Patent History  ·  Patent History
Description

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.

Claims

The ornamental design for an underdrain, as shown and described.

Referenced Cited
U.S. Patent Documents
3840117 October 1974 Ross
3956134 May 11, 1976 Sturgill
5068034 November 26, 1991 Walter
5108627 April 28, 1992 Berkebile
5149427 September 22, 1992 Brown
5160614 November 3, 1992 Brown
5296138 March 22, 1994 Walter
5328608 July 12, 1994 Bergmann
5462664 October 31, 1995 Neuspiel
5489388 February 6, 1996 Brown et al.
5639384 June 17, 1997 Brown
6143188 November 7, 2000 Jantsch et al.
Other references
  • “Leopold® Universal Type S™ Underdrain. The Proven Standard of Excellence Made Better,” FB Leopold Company, Inc.; 1994.
  • Excerpt from FB Leopold Company, Inc's Web page.
  • “Trilateral Air/Water Underdrain” Roberts Leotech, Inc. 1999.
  • “Trilateral® Air/Water Filter Underdrain Product Specifications” Roberts Leotech, Inc.
  • Three sheets of drawings on Roberts Trilateral Underdrain.
Patent History
Patent number: D519601
Type: Grant
Filed: Sep 17, 2004
Date of Patent: Apr 25, 2006
Assignee: RG Delaware, Inc. (Wilmington, DE)
Inventor: Mark Kevin Addison (Bear, DE)
Primary Examiner: Robin V. Webster
Attorney: Merek, Blackmon & Voorhees, LLC
Application Number: 29/213,398