Patent ID: 8388835

Claim:
A storm drain inlet filter apparatus for preventing passage of particulate and solids in water entering through an entry aperture defined by an aperture perimeter and communicating with an underlying storm drain system, comprising: a filter element, said filter element having a perimeter, said perimeter defining an area of a first side surface and an opposing second side surface; a mount, said mount projecting from said first side surface; means for biased engagement of said mount with sidewalls defining said entry aperture to thereby position said filter element in an as used position comprising, said mount comprising a ring having a diameter, said diameter of said ring being larger than a diameter of said entry aperture which said ring contacts in said biased engagement, said filter element positionable to said as-used position by a forcing of said ring within said aperture whereby a deformation of said ring imparts an outward force on said ring, and said outward force providing said biased engaged of said ring; and said filter element in said as-used position, providing a filtering of substantially all said water prior to said water entering said entry aperture.