Stormwater filtration apparatus, system and method
US8658044B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 2010 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Oct 18, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/001
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A stormwater filter cartridge includes a housing with internal filter medium disposed along a flow path between a water inlet and a filtered water outlet. A solid wall float tube in a drainage space has an open lower end and open upper end and is movable between a lowered position and a raised position. As the housing fills, water level in the housing rises to cause the solid wall float tube to move to the raised position and a negative pressure draws fluid through the filter medium. As water level outside the filter cartridge drops, air enters the housing and causes the solid wall float tube to drop to the lowered position, and filtered water in a fluid reservoir backflows through the filter medium while air enters the housing by passing upward through the solid wall float tube so as to enhance rate of backflow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.