# US 2014/0190356 A1 · Silica Reduction Cover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190356 A1 - Document ID: US20140190356A1 - Status: Published application - Kind: A1 - Application number: 14/152,914 - Filed: 2014-01-10 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Black Bow SDR, LLC - Inventors: Brian Barrett; David Pena; Matthew Bataille - Web page: https://patentgrep.com/patent/US20140190356A1 ## CPC - B01D 46/0004: {Details of removable closures, lids, caps or filter heads} - B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)} - B01D 46/10: Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces - 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) ## Abstract A filter used to reduce the emission of silica particles used in hydraulic fracturing. The silica reduction cover is a custom fit filter installed onto vent hatches of proppant storage trailers. Proppant storage trailers, or “frac sanders,” have a series of vent hatches that release air and fine particles into the atmosphere during material transfer operations. The silica reduction cover is comprised of filter material and permits the controlled release of high pressure air at each vent hatch while reducing sand particle loss. The silica reduction cover maintains proppant sand product in the trailer for production use while significantly reducing the emission of airborne sand particles in the immediate work and adjoining site areas. The silica reduction cover incorporates a viewing window so that workers may monitor proppant levels in the storage trailer while the silica reduction cover is installed. ## Claims ### Claim 1 A silica reduction filter comprising: a cover that is adapted for installation on the lip of a proppant storage trailer vent hatch; and a means for removeably attaching the cover onto the lip of a proppant storage trailer vent hatch. ### Claim 2 (depends on 1) The filter of claim 1, wherein the cover is box-shaped and is closed on the upper end and open on the lower end. ### Claim 3 (depends on 1) The filter of claim 1, wherein the cover is comprised of filter fabric. ### Claim 4 (depends on 1) The filter of claim 1, wherein the means for removably attaching the cover onto the lip of a proppant storage trailer vent hatch comprises one or more straps inserted into strap loops sewn around the lower perimeter of the cover. ### Claim 5 (depends on 4) The filter of claim 4, wherein the ends of the straps are fastened together using a ratcheting strap tightener. ### Claim 6 (depends on 1) The filter of claim 1, further comprising one or more clear viewing windows incorporated into the cover. ### Claim 7 (depends on 1) The filter of claim 1, further comprising one or more clear viewing windows incorporated into the cover and one or more closeable flaps that may be fastened over the one or more clear viewing windows. ### Claim 8 (depends on 1) The filter of claim 1, further comprising a flexible gasket material incorporated into the inside perimeter of the lower end of the cover, where the gasket material is adapted to form a tight seal between the lower end of the cover and the lip of a proppant storage trailer vent hatch. ### Claim 9 (depends on 8) The filter of claim 8, wherein the flexible gasket material is comprised of synthetic wool ### Claim 10 (depends on 1) The filter of claim 1, further comprising a series of magnets incorporated into the inside perimeter of the lower end of the cover to facilitate a tight seal between the lower end of the cover and the lip of a proppant storage trailer vent hatch ### Claim 11 (depends on 1) The filter of claim 1, further comprising one or more vents incorporated into the cover to allow excess pressure to escape. ### Claim 12 A silica reduction filter comprising: a cover that is adapted for installation on the lip of a proppant storage trailer vent hatch, where the cover is made of filter fabric and is closed on the upper end and open on the lower end; a means for removeably attaching the cover onto the lip of a proppant storage trailer vent hatch comprising one or more straps inserted into strap loops around the lower perimeter of the cover; one or more clear viewing windows incorporated into the cover; and flexible gasket material incorporated into the inside perimeter of the lower end of the cover, where the gasket material is adapted to form a tight seal between the lower end of the cover and the lip of a proppant storage trailer vent hatch. ### Claim 13 (depends on 12) The filter of claim 12, wherein the flexible gasket material is comprised of synthetic wool. ### Claim 14 (depends on 12) The filter of claim 12, further comprising a series of magnets incorporated into the inside perimeter of the lower end of the cover to facilitate a tight seal between the lower end of the cover and the lip of a proppant storage trailer vent hatch ### Claim 15 (depends on 12) The filter of claim 12, further comprising one or more vents incorporated into the cover to allow excess pressure to escape. ### Claim 16 (depends on 12) The filter of claim 12, wherein the ends of the straps are fastened together using a ratcheting strap tightener. ### Claim 17 (depends on 12) The filter of claim 12, further comprising one or more closeable flaps that may be fastened over the one or more clear viewing windows.