Patent ID: 7186333
Filing Date: 2007-03-06
Classification: E03F

Abstract:
1. A storm drain filter system to capture liquid runoff comprising: a liquid capturing chamber shaped to hang into multiple sizes of storm drains, secured by a top plate overlapping the circumference of the storm water hole, the chamber having an inlet, an overflow outlet and multiple levels of outflow filtration therein below said inlet, the top plate of the chamber having a circular or oval ring compartment having an interior, exterior and a half bottom wall with holes in the interior and bottom wall, and forming a periphery on the outside of the chamber inlet, the overflow outlet just below the ring compartment with a back flow shield extending into the chamber; a ring of hydrocarbon filtration material located in the ring compartment for removing hydrocarbons, oils and other small particles; said capturing chamber having multiple levels of perforated metal filtering plates containing holes or wire mesh screen below the overflow outlet, whereby the water passes through the plate or screen and into the drain, the plate or screen at the bottom of the chamber having the smallest diameter filtering holes, the plate or screens above the lower plate or screen being of successively larger diameter holes, runoff entering said storm drain is filtered through the hydrocarbon and screens and the particles, debris and solids are captured in said chamber.