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| Number | Title | Issue Date |
| 8151999 | Plastic septic tank having layered composite wall A septic tank or storage tank has a corrugated thermoplastic wall which has a composite layered structure. A tank wall comprises an inner layer of solid plastic for containing liquid; an outer layer made of solid plastic, for resisting external mechanical forces, an... | 04/10/2012 |
| 7914231 | Leaching chamber having a diagonally ribbed top A leaching chamber having opposing inwardly and upwardly running sidewalls extending toward a top portion is provided, wherein the leaching chamber includes a plurality of peak and valley corrugations formed by the sidewalls and extending over the top portion and a ... | 03/29/2011 |
| 7914230 | Corrugated leaching chamber with hollow pillar supports A plastic leaching chamber has an arch shape cross section, corrugations, and one or more hollow pillars extending downwardly within the interior of the chamber, to support the top of the chamber when the chamber is under load during use. Chambers nest within one an... | 03/29/2011 |
| D630294 | Corrugated leaching chamber | 01/04/2011 |
| 7632447 | Molding a leaching chamber sidewall An arch shape cross section thermoplastic leaching chamber, having sidewall slot perforations which flare inwardly, is made using a mold comprised of a mold cavity part and an inwardly retractable mold core part. The core part has opposing side slides with projectio... | 12/15/2009 |
| 7585130 | Leaching chamber with inward flaring sidewall perforations A leaching chamber has sidewall perforations which flare inwardly, so that the smallest perforation dimension is on the exterior surface of the sidewall. The basic axes of the perforations run downwardly toward the chamber base, as the axes run from the inside to ou... | 09/08/2009 |
| 7473053 | Arch shape cross section chamber having corrugations with flattened web segments An injection molded plastic corrugated leaching or storm water chamber has a peak corrugations segment with a flattened and thickened web. The web is the portion of the corrugation which runs from the peak to the floor of the adjacent valley. Preferably, flattened w... | 01/06/2009 |
| 7465122 | Leaching chamber having high leaching area to weight ratio A continuous curve arch shape cross section leaching chamber made of molded thermoplastic has closely spaced corrugations and sidewalls, portions of which are perforated with horizontal slots. Either or both of the slot height and the local wall thickness of the sid... | 12/16/2008 |
