|
| US3954612 | 26 Jun 1974 | 4 May 1976 | | Septic tank system |
| US4319998 | 25 Jun 1980 | 16 Mar 1982 | | Monitor for an effluent disposal system |
| US4710295 | 9 Sep 1985 | 1 Dic 1987 | | Septic tank filters |
| US4715966 | 26 Nov 1985 | 29 Dic 1987 | Ingenuity Unlimited, Inc. | Septic tank sludge level indicator |
| US5198113 | 23 Oct 1990 | 30 Mar 1993 | | Septic system filtering arrangement, filter material and method of using |
| US5207896 | 9 Feb 1990 | 4 May 1993 | Norwalk Wastewater Equipment Company | Wastewater treatment mechanism |
| US5242584 | 22 Ene 1992 | 7 Sep 1993 | | All-fluid septic tank with incorporated liquid collector |
| US5264120 | 13 Dic 1991 | 23 Nov 1993 | Norwalk Wastewater Equipment Company | Wastewater treatment mechanism |
| US5306425 | 27 Abr 1993 | 26 Abr 1994 | Norwalk Wastewater Equipment Company | Wastewater treatment mechanism |
| US5382357 | 1 Nov 1993 | 17 Ene 1995 | | Septic tank outlet filter |
| US5409604 | 25 Abr 1994 | 25 Abr 1995 | Norwalk Wastewater Equipment Company | Closure for a wastewater treatment mechanism |
| US5427679 | 30 Mar 1993 | 27 Jun 1995 | | Septic system filter assembly, filter arrangement |
| US5482621 | 11 Abr 1994 | 9 Ene 1996 | | Septic tank outlet filter |
| US5562819 | 8 Nov 1995 | 8 Oct 1996 | Fresh Creek Technologies, Inc. | Apparatus for trapping, signalling presence of and collecting debris in waterways |
| US5580453 | 11 Ago 1995 | 3 Dic 1996 | | Filter apparatus for waste water discharge system |
| US5582716 | 8 May 1995 | 10 Dic 1996 | | Filter for septic tanks |
| US5591331 | 8 May 1995 | 7 Ene 1997 | | Filter device including a housing with removable sidewalls having a filtering capacity |
| US5593584 | 8 May 1995 | 14 Ene 1997 | | Septic tank filter |
| US5635064 | 30 Jun 1995 | 3 Jun 1997 | | Waste water filter |
| US5645732 | 27 Jun 1995 | 8 Jul 1997 | | Septic system filter assembly, filter arrangement and method of using |
| US5683577 | 22 May 1996 | 4 Nov 1997 | | Filter device for wastewater treatment system |
| US5736035 | 19 Ago 1996 | 7 Abr 1998 | | Outlet filter for waste water treatment tank |
| US5759393 | 18 Nov 1996 | 2 Jun 1998 | | Filter device |
| US5762790 | 2 Jun 1997 | 9 Jun 1998 | Zoeller Co. | Septic tank filtering system |
| US5795472 | 20 Nov 1996 | 18 Ago 1998 | | Multistage filter device including a housing with removable sidewalls having a filtering capacity |
| US5871640 | 25 Mar 1997 | 16 Feb 1999 | | Filter and housing |
| US5885452 | 28 May 1997 | 23 Mar 1999 | | Effluent filtering apparatus |
| US5985139 | 26 Ene 1998 | 16 Nov 1999 | Zoeller Company | Septic tank pump and filter system |
| US6015488 | 12 Nov 1998 | 18 Ene 2000 | | Filter system for septic tank |
| US6129837 | 6 Nov 1998 | 10 Oct 2000 | | Waste water treatment filter including a waste water level control alert device |
| US6136190 | 16 Jun 1999 | 24 Oct 2000 | Zoeller Co. | Septic tank filtering system |
| US6306299 | 6 Abr 2000 | 23 Oct 2001 | Harry L. Nurse, Jr. | Filtration device for a waste water treatment system |
| US6319403 | 23 Jun 1999 | 20 Nov 2001 | Tuf-Tite, Inc. | Effluent filter for septic tanks and other on-site waste disposal systems |
| US6331247 | 16 Ago 2000 | 18 Dic 2001 | Zoeller Company | Septic tank filtering system |
| US6360898 | 6 Abr 2000 | 26 Mar 2002 | Harry L. Nurse, Jr. | Filtration device for a waste water treatment system |
| US6440304 | 18 Ene 2000 | 27 Ago 2002 | | In-line filtration system for treatment of septic tank effluent |
| US6447680 | 24 Abr 2001 | 10 Sep 2002 | | Double pass septic tank outlet filter |
| US6478957 | 9 Nov 2000 | 12 Nov 2002 | Harry L. Nurse, Jr. | Filtering apparatus for a wastewater treatment tank |
| US6495040 | 6 Nov 2001 | 17 Dic 2002 | Zoeller Co. | Septic tank filtering system |
| US6811692 | 13 Dic 2001 | 2 Nov 2004 | Sim-Tech Filter, Inc. | Bristled septic filter |
| US6841066 | 5 Abr 2001 | 11 Ene 2005 | Harry L. Nurse, Jr. | Filtration device for a waste water treatment system |
| US6942796 | 23 Mar 2001 | 13 Sep 2005 | Premier Tech | Filter device for filtering a liquid |
| US7438326 | 31 Ago 2000 | 21 Oct 2008 | Tuf-Tite, Inc. | Tee baffle for use at inlet or outlet of septic and other on-site waste disposal systems |
| US7740756 | 4 Oct 2006 | 22 Jun 2010 | Peter W. Gavin | Wastewater filter system |
| USD354796 | 22 Sep 1993 | 24 Ene 1995 | | Filter |
| USD386241 | 19 Ago 1996 | 11 Nov 1997 | | Outlet filter for waste water treatment tank |
| USD431629 | 23 Jun 1999 | 3 Oct 2000 | Tuf-Tite, Inc. | Effluent filter |
| USD571433 | 24 May 2007 | 17 Jun 2008 | GAG/Sim-Tech Filters, Inc. | Flow-through filter cartridge |
