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| US6136190 | 16 Jun 1999 | 24 Oct 2000 | Zoeller Co. | Septic tank filtering system | | US6331247 | 16 Ago 2000 | 18 Dic 2001 | Zoeller Company | Septic tank filtering system | | US6338797 | 13 Jun 2000 | 15 Ene 2002 | Harry L. Nurse, Jr. | Filter device for wastewater treatment system | | US6495040 | 6 Nov 2001 | 17 Dic 2002 | Zoeller Co. | Septic tank filtering system | | US7658857 | 8 Ene 2008 | 9 Feb 2010 | | Treating runoff | | US7981300 | 8 Feb 2010 | 19 Jul 2011 | | Treating runoff |
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