# US 2020/0399883 A1 · Surface Drain Precursor Screen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399883 A1 - Document ID: US20200399883A1 - Status: Published application - Kind: A1 - Application number: 16/995,823 - Filed: 2020-08-18 - Published: 2020-12-24 - Earliest claimed: 2019-06-18 - Assignees: Safe Drain Stormwater Holdings, Inc. - Applicants: Safe Drain Stormwater Holdings, Inc. - Inventors: John P. Deming - Web page: https://patentgrep.com/patent/US20200399883A1 ## CPC - E03F 5/14: Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates (for use in sewage purification plants or both in sewage purification plants or in sewer systems B01D, C02F {; gullies with sediment traps E03F5/04}) - B01D 29/03: self-supporting - B01D 29/05: supported - B01D 29/15: arranged for inward flow filtration - B01D 29/50: with multiple filtering elements, characterised by their mutual disposition (B01D29/39 takes precedence) - B01D 29/56: in series connection - B01D 35/1573: {Flow control valves} - B01D 39/10: Filter screens essentially made of metal - C02F 1/004: {using large scale industrial sized filters} - E03F 5/0404: {with a permanent or temporary filtering device; Filtering devices specially adapted therefor} - E03F 5/06: Gully gratings - B01D 2201/16: Valves - B01D 2201/188: Multiple filtering elements having filtering areas of different size - C02F 2103/001: {Runoff or storm water} - C02F 2201/005: Valves - E03F: SEWERS; CESSPOOLS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract A storm drain precursor screen comprising a perforated tray with a frame configured to capture and remove debris and trash from stormwater runoff that occurs during a wet weather event. The storm drain precursor screen is configured to fit within the physical geometry of each storm drain intake. Where a shoulder is not provided in a storm drain collection box, additional supports may be bolted or anchored into the walls of the collection box to support the precursor screen. ## Claims ### Claim 1 A surface drain precursor screen comprising: a. a perforated tray; b. said perforated tray joined to a frame and configured to rest on a support in a collection box. ### Claim 2 (depends on 1) The surface drain precursor screen of claim 1 wherein said perforated tray includes a passthrough assembly for receiving a distal end of a valve key to operate a valve positioned below said precursor screen. ### Claim 3 (depends on 1) The surface drain precursor screen of claim 1 wherein said valve is positioned above a secondary basin; said secondary basin collecting debris not captured by said surface drain precursor screen. ### Claim 4 (depends on 1) The surface drain precursor screen of claim 1 wherein said distal end of said valve key has a tip sized to fit through an opening in said passthrough assembly while still having sufficient size to engage a handle on a valve stem of said valve for opening and closing said valve; and, said valve key having a proximal end with an operating handle sufficiently sized to allow a single individual to open and close said valve via rotational force. ### Claim 5 (depends on 1) The precursor screen of claim 1 wherein said precursor screen is sized to fit within the inlet of a secondary basin positioned in a collection box. ### Claim 6 (depends on 1) The precursor screen of claim 1 wherein said perforated tray is joined to said frame using rivets. ### Claim 7 A precursor screen having a perforated tray, said perforated tray comprising: a. a base screen; b. a first end screen; c. a second end screen; and, d. a support frame for positioning said precursor screen on a perimeter support of a secondary basin. ### Claim 8 (depends on 7) The precursor screen of claim 7 wherein said frame includes a plurality of rivet holes distributed about a perimeter leg of said frame, said rivet holes spaced and aligned to correlate with said perforations in said perforated tray for assembly using rivets. ### Claim 9 (depends on 7) The precursor screen of claim 7 wherein said perimeter support comprises two or more shoulders of a collection box. ### Claim 10 (depends on 7) The precursor screen of claim 7 wherein said perimeter support comprises an upper rim of a secondary basin. ### Claim 11 (depends on 1) The precursor screen of claim 1 wherein said perimeter support comprises one or more flanges anchored to the interior of a collection box. ### Claim 12 (depends on 7) The precursor screen of claim 7 wherein said perforated tray and said frame are made from stainless steel. ### Claim 13 (depends on 7) The precursor screen of claim 7 wherein said perforated tray has perforations less than 5 mm in size to prevent particles 5 mm or larger from passing through said perforations. ### Claim 14 (depends on 13) The precursor screen of claim 13 wherein said perforations are no more than 1 mm in diameter, thereby preventing the passage of particles 1 mm or larger through said perforations. ### Claim 15 A precursor screen for separating larger debris from smaller debris to improve performance of downstream filtration devices, comprising: a. a perforated tray; b. said perforated tray positioned above a secondary basin; c. said secondary basin being sealed but for pores within a filtration device; d. said filtration device positioned within said secondary basin and providing further filtration of stormwater runoff for discharge into the collection box and stormwater network. ### Claim 16 (depends on 15) The precursor screen of claim 15 wherein said perforated tray includes a pass-through assembly for operating a closure for a valve positioned adjacent a floor of said secondary basin. ### Claim 17 (depends on 16) The precursor screen of claim 16 wherein said pores of said filtration device are smaller than the perforations to provide two stages of filtration. ### Claim 18 (depends on 17) The precursor screen of claim 17 wherein said filtration device includes two or more filtration layers to capture smaller particles and remove one or more contaminants in the runoff. ### Claim 19 (depends on 15) The precursor screen of claim 15 wherein said perforated tray is combined with said secondary basin for unitary installation in the collection box. ### Claim 20 (depends on 19) The precursor screen of claim 19 wherein said precursor screen may be easily dismantled and removed from said secondary basin thereby supporting simpler disposal of captured trash in said perforated tray.