Patent application number | Description | Published |
20080217241 | COMPOSITE FILTER MEDIA AND METHODS OF MANUFACTURE - A composite filter media structure is provided. In an exemplary embodiment, the composite filter media structure includes a corrugated base substrate that includes a nonwoven synthetic fabric formed by a dry-laid process that corrugates the base substrate during the forming process. The composite filter media structure also includes a nanofiber membrane deposited on at least one side of the base substrate by an electro-blown spinning process. | 09-11-2008 |
20080314010 | COMPOSITE FILTER MEDIA - A composite filter media structure includes, in an exemplary embodiment, a base substrate that includes a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process. The base substrate has a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure A nanofiber layer is deposited on one side of the base substrate. The composite filter media structure has a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure. | 12-25-2008 |
20080315464 | METHOD OF MANUFACTURING A COMPOSITE FILTER MEDIA - A method of making a composite filter media includes, in an exemplary embodiment, forming a nonwoven fabric mat that includes a plurality of synthetic fibers by a spunbond process, and calendaring the nonwoven fabric mat with embossing calendar rolls to form a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area to bond the synthetic fibers together to form a nonwoven fabric, the nonwoven fabric having a minimum filtration efficiency of about 50%, measured in accordance with ASHRAE 52.2-1999 test procedure. The method also includes applying a nanofiber layer by electro-blown spinning a polymer solution to form a plurality of nanofibers on at least one side of the nonwoven fabric mat to form the composite filter media, the composite filter media having a minimum filtration efficiency of about 75%, measured in accordance with ASHRAE 52.2-1999 test procedure. | 12-25-2008 |
20090249956 | AIR FILTRATION MEDIUM WITH IMPROVED DUST LOADING CAPACITY AND IMPROVED RESISTANCE TO HIGH HUMIDITY ENVIRONMENT - A filtration medium is disclosed for use in air filters used in heating, ventilating and air conditioning systems. The medium contains at least one nanofiber layer of fibers having diameters less than 1 μm and at least one upstream layer, the medium having sufficient holding capacity for dust particles that efficiency loss and pressure loss across the medium are minimized during use. | 10-08-2009 |
20100024370 | COMPOSITE FILTER MEDIA - A composite filter media structure includes, in an exemplary embodiment, a base substrate that includes a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process. The base substrate has a filtration efficiency of about 35% to less than 50%, measured in accordance with EN 1822 (1998) test procedure A nanofiber layer is deposited on one side of the base substrate. The composite filter media structure has a minimum filtration efficiency of about 70%, measured in accordance with EN 1822 (1998) test procedure. | 02-04-2010 |
20100025892 | METHOD OF MANUFACTURING A COMPOSITE FILTER MEDIA - A method of making a composite filter media includes, in an exemplary embodiment, forming a nonwoven fabric mat that includes a plurality of synthetic fibers by a spunbond process, and calendering the nonwoven fabric mat with embossing calender rolls to form a bond area pattern comprising a plurality of substantially parallel discontinuous lines of bond area to bond the synthetic fibers together to form a nonwoven fabric, the nonwoven fabric having a filtration efficiency of about 35% to less than 50%, measured in accordance with EN 1822 (1998) test procedure. The method also includes applying a nanofiber layer by electro-blown spinning a polymer solution to form a plurality of nanofibers on at least one side of the nonwoven fabric mat to form the composite filter media, the composite filter media having a minimum filtration efficiency of about 70%, measured in accordance with EN 1822 (1998) test procedure. | 02-04-2010 |
20100139224 | FILTER MEDIA WITH NANOWEB LAYER - A filter media for filtering particulates from air or other gases contains a membrane, and a depth filtration layer upstream and in fluid contact with the membrane. The depth filtration layer contains a nanoweb layer and a prefiltration layer upstream of and in fluid communication with the nanoweb layer. The prefiltration layer may be a nonwoven, and in one embodiment, specifically a melt blown nonwoven which may also be charged. | 06-10-2010 |
20110214570 | AIR FILTRATION MEDIUM WITH IMPROVED DUST LOADING CAPACITY AND IMPROVED RESISTANCE TO HIGH HUMIDITY ENVIRONMENT - A method for filtering particles from water mist laden air involves passing the air through a medium that has a nanoweb layer in fluid contact with a hydrophobic nonwoven web. The hydrophobic web can be made of an intrinsically hydrophobic material, or can be coated with a hydrophobic coating. The medium does not undergo the large pressure drops normally associated with filtration of water mists and retains its efficiency well. | 09-08-2011 |
20120070587 | FILTRATION MEDIA FOR FILTERING PARTICULATE MATERIAL FROM GAS STREAMS - A composite fabric formed by depositing a web of nanofibers electroblown from a first polymer onto a first support web comprising fibers of larger average diameter than the nanofibers spun from a compatible material, in the absence of an adhesive between the webs, and solvent-bonding the webs together. | 03-22-2012 |
20130126418 | LIQUID FILTRATION MEDIA - The present invention relates to a liquid filtration medium comprising at least one nonwoven sheet wherein the nonwoven sheet has a water flow rate of at least 10 ml/min/cm | 05-23-2013 |
20130248175 | METHOD FOR RECOVERING HYDROCARBON FLUIDS USING A HYDRAULIC FRACTURING PROCESS - A method for recovering and treating hydrocarbon fluids using a hydraulic fracturing process wherein a fluid stream containing liquid or gaseous hydrocarbon species or both, produced water, suspended solids, and dissolved contaminants is recovered from a well. and hydrocarbon species are separated from the fluid stream to produce a second fluid stream comprising liquid water, which is then directed to a filter medium and essentially all of the second fluid stream passes through the medium to produce a permeate stream and a filter cake, and the filter cake is separated from the medium and disposed of separately. | 09-26-2013 |
20130248454 | PRODUCED WATER TREATMENT IN OIL RECOVERY - An oil recovery process that utilizes one or more filtration media having an efficiency of 30% or greater for particles of 1 micrometer size or greater and a flow rate of 2 milliliters per minute per centimeter squared of media per unit pressure of the liquid (ml/min/cm2/kPa) to remove silica and/or oil and/or dissolved organics and/or dissolved solids from produced water which includes separating oil from the produced water and precipitating silica into particles and wherein the produced water having the precipitated silica is directed to a filtration medium which operates in a direct flow filtration mode and removes the precipitated silica from the produced water to form a permeate stream. | 09-26-2013 |
20140134498 | SEPARATOR MEDIA FOR ELECTROCHEMICAL CELLS - A separator medium for electrochemical cells that contains at least one nonwoven sheet of polymeric fibers. The nonwoven sheet has a surface area of about 0.5 to about 1.5 m | 05-15-2014 |
20150021273 | PRODUCED WATER TREATMENT IN OIL RECOVERY - An oil recovery process that utilizes one or more filtration medium comprises a filter cake and a second filtration medium being nonwovens sheet to remove silica and/or oil and/or dissolved organics and/or dissolved solids from produced water which includes separating oil from the produced water and precipitating silica into particles and wherein the produced water having the precipitated silica is directed to a filtration medium which operates in a direct flow filtration mode and removes the precipitated silica from the produced water to form a filtrate stream. | 01-22-2015 |