Underdrain
Latest RG Delaware, Inc. Patents:
- Flume system for a filter system including at least one filter having a filter bed that is periodically washed with liquid, gas or a combination thereof
- Dissolved air flotation clarifier
- FLUME SYSTEM FOR A FILTER SYSTEM INCLUDING AT LEAST ONE FILTER HAVING A FITLER BED THAT IS PERIODICALLY WASHED WITH LIQUID, GAS OR A BOMBINATION THEREOF
- Underdrain system
- Flume system for a filter system including at least one filter having a filter bed that is periodically washed with liquid, gas or a combination thereof
Description
Claims
The ornamental design for an underdrain, as shown and described.
Referenced Cited
U.S. Patent Documents
Other references
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. |
- “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” Robert Leotech, Inc.
- Three sheets of drawings on Roberts Trilateral Underdrain.
Patent History
Patent number: D565148
Type: Grant
Filed: Apr 25, 2006
Date of Patent: Mar 25, 2008
Assignee: RG Delaware, Inc. (Wilmington, DE)
Inventor: Mark Kevin Addison (Bear, DE)
Primary Examiner: Robin Webster
Attorney: Merek, Blackmon & Voorhees, LLC
Application Number: 29/258,594
Type: Grant
Filed: Apr 25, 2006
Date of Patent: Mar 25, 2008
Assignee: RG Delaware, Inc. (Wilmington, DE)
Inventor: Mark Kevin Addison (Bear, DE)
Primary Examiner: Robin Webster
Attorney: Merek, Blackmon & Voorhees, LLC
Application Number: 29/258,594
Classifications