Underdrain

Details Underdrain Underdrain

2006-04-25

2006-04-25

Webster, Robin V. (Department: 2911)

Environmental heating and cooling; fluid handling and sanitary e

Fluid handling or treatment equipment

Treatment

CD23S261000

Design Patent

active

D0519601

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

REFERENCES:
patent: 3840117 (1974-10-01), Ross
patent: 3956134 (1976-05-01), Sturgill
patent: 5068034 (1991-11-01), Walter
patent: 5108627 (1992-04-01), Berkebile
patent: 5149427 (1992-09-01), Brown
patent: 5160614 (1992-11-01), Brown
patent: 5296138 (1994-03-01), Walter
patent: 5328608 (1994-07-01), Bergmann
patent: 5462664 (1995-10-01), Neuspiel
patent: 5489388 (1996-02-01), Brown et al.
patent: 5639384 (1997-06-01), Brown
patent: 6143188 (2000-11-01), Jantsch et al.
“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.

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