Abstract: A filter unit comprising a filter part made of an adsorbent-bearing filtration material and characterized in that said filter part is integrally molded with a filter holding frame made of a thermoplastic resin and that the adsorbent of the filter part is packed to the position contacting the filter holding frame.

Abstract: A drum vent filter useful for venting hydrogen gas from transuranic wastes in order to remove particles from the gas while controlling the release of VOCs has a carbon-to-carbon filter media of increased density with a relatively large filter face and reduced thickness. In addition, a protective lid is provided over the filter element which has been substantially increased so as to enhance the diffusion of hydrogen gas through the filter element.

Abstract: A filter includes at least two different adsorptive media. First, chemisorptive media, which is porous and includes an acidic functional group, is used to remove molecular bases, including ammonia, organic amines, imides and aminoalcohols, from the atmosphere used in semiconductor fabrication and other processes that require uncontaminated gaseous environments of high quality. Second, physisorptive media is able to adsorb condensable contaminants, particularly those having a boiling point greater than 150 degrees C. The physisorptive media can include untreated, activated carbon.

Abstract: Membrane filters for the collection and detection of air-borne microorganisms are made from gelatin treated with an osmoprotective agent and exhibit the capacity to at least double the number of viable bacteria captured in a given sample relative to conventional gelatin membrane filters.

Abstract: The present invention relates to a fresh air filter that comprises a highly air-permissive two- or three-dimensional support made of a cross-linked polymeric foam which includes pores of large dimensions. The support comprises joining portions which are coated with a layer of ion-exchange globules.

Abstract: A method and apparatus for making filter elements in which a mixture of activated carbon granules and fibers are processed with meltable polymer fibers to form a porous element. The density of the porous structure increases in a direction from the periphery thereof to its center. Also, the article formed by the method using the apparatus.

Abstract: A bulk tank depressurization filter apparatus is disclosed which comprises a filter cartridge having an inlet and an outlet, a gas passageway therebetween, at least one gas-capturing filter through which gas in the gas passageway passes, and a Chicago coupling for attaching the inlet of the filter cartridge to a tank containing a pressurized gas. Also disclosed is a method of capturing the residual gas in a tank containing a gas under pressure using the bulk tank depressurization filter apparatus. The inlet is attached to the tank and the pressurized gas is permitted to flow from the tank into the filter cartridge where the gas is captured by the material in the filter.

Abstract: A filter for gases, particularly for ventilation, is provided with elongated flow channels (3) which are at least partly formed by superimposing material layers (1) between which the flow channels (3) are formed so that their starting ends are open to a gas inlet (A) and their terminal ends are open to a gas outlet (B), wherein the gas flow between the starting ends and the terminal ends in the channels (3) is arranged parallel to the planes of the material layers (1), and the layers contain an adsorbent in which impurities are adsorbed from the flow in the channels (3). The material layers have, on top of each other, at least one support layer (1a) and a porous adsorbent layer (1b) kept in place by the support layer (1a). The channels (3) are formed between spacers (2) which contain porous adsorbent material, constitute elevated areas on the material layers (1), and keep them separate at the channels (3).

Abstract: A regenerable high capacity carbon dioxide (CO2) sorbent is operated to remove substantially all of the CO2 present in either a dry, or a humid environment. The sorbent is an amine compound which is composed predominantly of secondary amine groups, and includes one or more functional nitrile groups. Primary and tertiary amine groups form a minor percent of the sorbent. The reaction product of tetraethylenepentamine (TEPA) and acrylonitrile (AN), which reaction product will be referred to hereinafter as “TEPAN” is a preferred sorbent. The addition of one or more nitrile functional groups to TEPA by reason of the reaction between AN and TEPA converts most of the primary amines in TEPA to secondary amines in TEPAN.

Abstract: In one embodiment, the filter cartridge comprises a mesh structure forming a generally annular cylinder comprising a center opening, a plurality of compartments containing a filter medium, and spaces between the compartments. The spaces between the compartments comprise substantially unimpeded airflow passages that permit airflow even when the filter medium is fully loaded.

Abstract: An odor adsorptive filter for use in refrigerators, freezers, and/or other cold storage units, is removably securable to one of the interior walls or panels of the unit and adsorbs odoriferous matter from spoiled foods, strong food odors, etc. as the air within the unit circulates. The present filter comprises a filter housing which is removably secured within the refrigerator or freezer by suction cups which adhere securely to the smooth surfaces of such units, without damage or marring of the surface. The filter element is in turn removably secured within the filter housing, for replacement as necessary. The filter element comprises a woven or nonwoven fiber material, with the fibers being coated or impregnated with an odor adsorbent material such as baking soda and/or activated carbon in some form. The filter element, or the housing, may also include a pleasant scent which will permeate the air in the cold storage device as unpleasant odors are adsorbed by the filter element.

Abstract: Activated carbon filters containing transition metals, are prepared by (a) exchanging the transition metal with a cellulose ion exchange material to produce a cellulose material containing the transition metal; (b) charring of the product of (a); activating the product of (b) to form an activated carbon filter having a pore network throughout; and removing surface carbon substantially throughout the pore network of the filter formed in (c). Methods of filtering an atmosphere containing a gaseous contaminant by passing the contaminated atmosphere through a filter made by this process are described.

Abstract: A gas accumulator for storing pressurized gases, in particular gaseous fuels such as hydrogen or the like, which gas accumulator has a sealed vessel which is provided with a valve-actuated feed line and outlet line for the pressurized gas and with a solid packing of carbon nanostructures. To increase the storage capacity of a gas accumulator of this type significantly, the particles of the carbon nanostructures are compacted to form larger coherent conglomerates having an apparent density which is increased in comparison with the apparent density of the originally loose particles. The compaction can be carried out, for example, by ordering the carbon nanostructures in their orientation to one another, or else by forming the conglomerates by pressing non-ordered carbon nanostructures.

Abstract: A life cell for use in a disaster and a filtration system utilized with such a life cell. The life cell includes a contaminant detector, for detecting the presence of a contaminant in a volume of air, and an air filtration system for removing contaminants from the volume of air. The air filtration system of the life cell includes an air inlet, HEPA filter in fluid communication with the air inlet for removing particulate contaminants from the volume of air, and a carbon filter in fluid connection with the HEPA filter for removing chemical and biological contaminants from the volume of air. A blower is placed in fluid communication with the carbon filter and HEPA filter and acts to draw the volume of air from the air inlet, through the HEPA filter and carbon filter, and exhaust the volume of air such that a positive pressure is created. The preferred life cell includes a carbon filter made up of two layers of foam, an activated carbon filter medium, and a Whetlerite carbon filter medium.

Abstract: A respirator (10) includes a filter cartridge (12) that has a housing (16) and a bonded sorbent filter element (20). Housing (16) includes a sleeve (32) that has an inner surface (36) and a folded edge (42). The filter element (18) includes a bonded sorbent filter element (20) that is pressed against the sleeve's inner surface (36) and that is held in the sleeve (32) by the folded edge (42).

Abstract: Agglomerates based on active charcoal and on binder exhibit a good resistance to disintegration in a liquid medium as well as an excellent resistance to crushing and an excellent thermostability up to 350° C. They are prepared by mixing active charcoal powder with a pore-protecting agent in gel form and then mixing with a binder, followed by the agglomeration, shaping and curing of the agglomerates obtained. They can be used as adsorption agents for the treatment, for the seperation or the purification of gases, and for the decoloration, purification and deodorization of liquids.

Abstract: Channel flow filtration media possessing high efficiency and low pressure drop is formed from a plurality of filtration layers at least some of which include a multi-dimensional channel pattern having a plurality of continuous, tortuous channels and a multi-dimensional edge at each end of the plurality of channels formed therein. The filtration medium is configured as a stack with the multi-dimensional edge of the channel pattern forming a plurality of inlets open through a first face of the stack, a plurality of outlets open through a second face of the stack, and a corresponding plurality of disruptive fluid pathways passing from the inlets through the stack to the outlets. The filtration layers may be formed from a non-woven material, such as a carbon loaded multi-layer BMF web capable of adsorption of undesired vapors and odors from a fluid.

Abstract: A unitary rigid filter that performs multiple contamination control functions within an enclosure for sensitive equipment (e.g., disk drives). The filter incorporates recirculation and adsorbent filtration, along with optional inlet and diffusion functions in a unique rigid filter construction.

Abstract: A filter device has a frame, a grid, a filter medium and, if desired, a gas adsorption medium. The frame is flexible so as to be temporarily deformable and is made of polypropylene, as is the grid. The filter medium is a mat of non-woven material and the gas adsorption medium is activated carbon.

Abstract: The invention relates to a composite enthalpy exchanger useful for transferring or removing latent and sensible heat from a gaseous stream. This enthalpy exchanger consists of a cellulose-based substrate impregnated with a polymeric desiccant. Also provided is a method of manufacture of the enthalpy exchanger wherein the process for synthesizing the polymer on the substrate is disclosed.

Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally includes a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.

Abstract: A combined filter, for removing solid particles and noxious gases from air to be delivered into the cabin of a vehicle, as part of a ventilating, heating and/or air conditioning system, comprises two layers of a non-woven tissue such as polypropylene, between which are deposited activated carbon granules. The two layers of non-woven tissue are interleaved at least partially, so as to trap the granules between them.

Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally include a diffiusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.

Abstract: A gaseous cleaner element comprising a housing having a gas inlet and a gas outlet with a gas stream formed therebetween. An immobilized mass of sorption material formed in a desired shape is mounted in the housing, the gas stream passing therethrough. A particulate filter layer is mounted in the housing adjacent to the mass, the gas stream passing therethrough. The particulate filter layer is mounted upstream of the sorption material mass. The air cleaner element can be used as a replacement to existing filter elements to provide sorption and particulate filtering to air circulation systems such as cabin air filter systems.

Abstract: Contamination Control System includes a housing having a cartridge input-output port and an application input-output port The cartridge is coupleable to the cartridge input-output port and of a size to completely fit in an interior of the housing. A dual isolation interface is provided between cartridge and housing so that each entity may be separately isolated at the fluid interface. The isolation interface is resiliently engageable to make the fluid path open and close. The cartridge has a body physically defining a multi-region interior chamber, the chamber in fluid communication with an input and an output and defining a fluid flow path therebetween larger than any dimension of the body.

Abstract: A filter assembly includes a shaped adsorbent article disposed in a housing. The shaped adsorbent article has one or more projections extending from a surface of the article toward the housing to provide for flow of fluid between the shaped adsorbent article and the housing. The filter assembly may optionally include a diffusion channel for additional filtering and/or one or more porous polymer films disposed over inlet or outlet openings in the housing to reduce or prevent particulate contamination. The filter assembly may be used in a device, such as a computer disk drive, to filter a fluid, such as air, within and/or entering or exiting the device.

Abstract: An adsorbent filter including compression molded particulate adsorbent construction is provided. The compression molded particulate adsorbent construction contains a particulate adsorbent and a sufficient amount of binder to retain the particulate adsorbent in a non-free flowing form. The adsorbent filter preferably includes a compression molded particulate adsorbent construction as described, positioned within an outer, porous cover. Preferably the outer, porous cover includes expanded porous polytetrafluoroethylene. In certain preferred applications, the adsorbent filter is positioned within a housing defining an internal volume and including therein electronic component(s), such that the adsorbent filter protects the internal volume of the housing, and components therein, from damage. The typical application is as a disk drive adsorbent filter. A preferred method for preparing an adsorbent filter according to the present invention is provided.

Abstract: A scent cartridge (1) with a substrate (3), wherein the latter consists of porous particles of silica gel, activated carbon and/or aluminum oxide, which are impregnated with scents or active ingredients. The substrate (3) is fixed in a small cylindrical glass or aluminum tube (2) by means of wiremesh caps (4) made of metal or plastic. A membrane disk (6) is sealingly held on each flanged edge (5) of the small glass or aluminum tube (2) by means of a cap (7) each so that the membrane disks (6) can be punctured with needles or cannulae for releasing scents or active ingredients and an air or carrier gas flow controlled in a time-dependent manner is then admitted to the scent cartridge (1).

Abstract: This invention relates to automotive evaporative emissions canisters. Such structures of this type employ a carbon-filled foam which adds adsorptive performance to the canister without having to enlarge the canister or having to change the carbon in the canister to a higher performance carbon.

Abstract: This invention is directed to the synthesis of high bulk density high gas absorption capacity adsorbents for gas storage applications. Specifically, this invention is concerned with novel gas absorbents with high gravimetric and volumetric gas adsorption capacities which are made from fullerene-based materials. By pressing fullerene powder into pellet form using a conventional press, then polymerizing it by subjecting the fullerene to high temperature and high inert gas pressure, the resulting fullerene-based materials have high bulk densities and high gas adsorption capacities. By pre-chemical modification or post-polymerization activation processes, the gas adsorption capacities of the fullerene-based adsorbents can be further enhanced. These materials are suitable for low pressure gas storage applications, such as oxygen storage for home oxygen therapy uses or on-board vehicle natural gas storage.

Abstract: A receiver/dryer includes a canister with a cylindrical sidewall, an integral lower end, and an open upper end. A pick-up tube is disposed centrally within the canister. The lower end of the pick-up tube has a wedged-shape and is supported by the lower end of the canister. The upper end of the pick-up tube has an annular groove that carries an O-ring seal. A lower baffle and lower filter pad are received over the pick-up tube with the lower baffle having a tight slip-fit therewith. Loose desiccant is supported by the lower baffle and filter pad. An upper filter pad and upper baffle are received over the pick-up tube, with the upper baffle having a slip-fit therewith. An upper end cap is secured to the open end of the canister, with the pick-up tube being received within an outlet passage in the upper end cap, and the O-ring seal providing a fluid-tight seal between the pick-up tube and the end cap.

Abstract: An adsorbent package is provided for mounting to a filter or bleed nipple that is, in turn, attached to a bright tube or other fluid flow conduit in an auto or truck accumulator or receiver dryer. In a preferred form of the invention, a centrally disposed opening is provided in the adsorbent package and is surrounded by a rigid collar. The aperture is dimensioned so that it will be force or snap fit over a flange or the like on a filter.

Abstract: A filter is provided which includes an organic vapor adsorbing layer, a first particulate removal layer, and a second particulate removal layer. The organic vapor adsorbing layer includes porous adsorbent beads which allow air or gas to flow therethrough with little resistance and provide increased surface area by virtue of the pores. The particulate removal layer can be made from an electrostatic and/or polytetraflouroethylene. The filter can have a figure of merit greater than about 10 and a capacity for permanently adsorbing organic vapors, wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0.3 .mu.m in an air flow having a velocity of 10.5 ft./min and for Frazier permeability at 0.5 inches H.sub.2 O.

Abstract: The invention discloses a filtering device (1) for neutralizing volatile bad smells present in the atmosphere or carried by a flow of gas (5). The device comprises at least a layer (3) of natural zeolite material of set thickness impregnated with an aqueous solution with, for 100 parts by weight of zeolite, about 5 to about 20 parts by weight of the aqueous solution. This aqueous solution comprises for 1000 parts by weight of water, between about 1 part and about 20 parts by weight of a composite mixture comprising, for one part of ammonium ions or equivalent, one part of at least of one perfuming and/or deodorising composition.

Abstract: A process, composition and apparatus for the removal of water from moist non-corrosive gases (such as those containing oxygen or CO.sub.2) down to .ltoreq.10-20 ppb water concentration are described. The dehydrating agent is an oxide or salt of an electropositive metal and has a surface area of at least 140 m.sup.2 /g, preferably 140-500 m.sup.2 /g, is compatible with the gas, and preferably is capable of dehydrating such gases to .ltoreq.1 ppb, preferably to as low as 500 ppt. The electropositive metal will be a Group 3b, 4b or lanthanide metal or vanadium. The preferred agent is a high surface area titania, zirconia, yttria or vanadia, with titania most preferred. The dehydrating agent can be in the form of a pelleted or granular bulk material or a coating on or within the pores of a substrate. The agent is retained in a simple container which is easily installed in a gas supply line for the gas, such as to a gas- or vapor-deposition manufacturing unit.

Abstract: A sorptive article is provided. The sorptive article includes a polyolefin, a wax which is miscible with the polyolefin at the melt temperature of the polyolefin but phase separates on cooling of the article, and sorptive particles distributed in the article. Also provided is a method for removing moisture or other vaporous or liquid material from air or an object in the environment utilizing a novel sorptive article of the invention.

Abstract: A method and apparatus are provided for the separation of non-polar organic molecules from fluids which utilize certain hydrocarbon block copolymers having soft and hard segments as absorbents. By employing hydrocarbon block copolymer having a particular concentration of soft and hard segments, optimum absortion is achieved while maintaining the mechanical structure of the absorbent so that it can withstand high fluid flow rates.

Abstract: A method and apparatus for testing and remediating the effects of radon infiltration in buildings. The method of this invention places fiber glass materials over radon-emitting surfaces in order to entrap radon and radon progeny. The fiber glass materials can be formed into mats having a packed geometry. Each mat has fiber bundles having several thousand individual fibers. Each fiber has an approximate diameter size of about 50 microns. The glass fiber consists of a silicon oxide glass that may be doped, for example, with trivalent cerium ions. The mats can be of any geometrical configuration, such as rectangular.

Abstract: A process and composition for removing moisture from a NF.sub.3 or F.sub.2 gas wherein the gas is contacted with alumina particles coated with aluminum trifluoride. The aluminum trifluoride is formed by reacting alumina particles with an aqueous solution of hydrogen fluoride.

Abstract: A system for capturing HAPs/VOCs from an existing or planned air stream and destroying the contaminants in the air stream by microbial degradation is disclosed. In general, the system is composed of a reservoir with a filter structure positioned above it. The filter structure contains a capture or filtration media through which contaminated air or vapors must pass. HAPs/VOCs in the air or vapors are filtered out and absorbed by the capture media. The reservoir contains a tank water bath that is inoculated with microorganisms that are selected to degrade the hazardous materials or pollutants removed by the capture media. Sprinkler heads above the filter structure spray the filter structure with a sprayed water bath also inoculated with the microorganisms, whereby contaminants caught in the filter structure are leached out and bioremediated.

Abstract: The present specification discloses an apparatus for reducing contamination at the head-disc interface. The preferred embodiment of the invention involves a data storage system for use in an environment where gaseous contaminants are present. The gaseous contaminants have a vapor pressure and a chemical composition. The data storage system has a housing. To attract gaseous contaminants present within the housing interior, a material is disposed within the housing interior. This material creates a competitive absorption or adsorption site for the gaseous contaminants.

Abstract: A column packing for use in the scrubbing of gases by aqueous liquid, the packing comprising material that is electrically conductive and material that is non-conductive with such materials being intimately mixed with each other, such that the packing as a whole provides the gas-liquid surface for absorption and the conductive material in particular serves as a bipolar electrode for electrolysis.

Abstract: A filter is provided which includes an organic vapor adsorbing layer, a first particulate removal layer, and a second particulate removal layer. The organic vapor adsorbing layer includes porous adsorbent beads which allow air or gas to flow therethrough with little resistance and provide increased surface area by virtue of the pores. The particulate removal layer can be made from an electrostatic and/or polytetraflouroethylene. The filter can have a figure of merit greater than about 10 and a capacity for permanently adsorbing organic vapors, wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0.3 .mu.m in an air flow having a velocity of 10.5 ft./min and for Frazier permeability at 0.5 inches H.sub.2 O.

Abstract: The invention relates to a device for removing one or more undesirable or dangerous substances for the human race from a gas or vapour mixture, the device comprising: a predetermined amount of adsorbent for adsorbing the substances and an odourant for releasing an odour in order to alarm a person, wherein the odourant is arranged in such a manner that the odourant is displaceable by the substances, following a predetermined level of saturation of the adsorbent.

Abstract: An antidiffusion layer is provided between a first fuel adsorption layer communicated with a fuel tank and a second fuel adsorption layer communicated with air. Since adsorbing ability of the antidiffusion layer is lower than that of the first and second fuel adsorption layers, pore diffusion of the fuel vapor from the first fuel adsorption layer to the second fuel adsorption layer is reduced. Since the antidiffusion layer forms a plurality of nonlinear passages, air diffusion of the fuel vapor is reduced. Therefore, the diffusion of the fuel vapor is suppressed with a thin, small and simple antidiffusion layer, and the canister can be simplified and the reduction of the number of parts and the cost thereof can be realized.

Abstract: An adsorbent material containing package is provided for use within the sealed canister of a liquid accumulator for an air conditioning system of the kind in which the suction tube within the canister has spaced upwardly extending legs connected by a bottom bite and in which the bleed opening in the bite is formed as a downwardly extending nipple. The adsorbent material package is formed with substantially identical first and second pouches formed of tubular porous polyester felt material with sealed upper and lower ends containing a quantity of adsorbent material. The pouches making up the package are joined to each other at upper flanges with the junction being located along an extension of a median line through the pouches and leaving the ends of the flanges free of attachment. The transverse width of the pouch flanges exceeds the spacing of the suction tube legs so that the flange end portions are splayed to receive one of the legs therebetween thereby locating the package in relation to the suction tube.

Abstract: Systems and methods for electrical swing natural gas adsorption are described. An apparatus includes a pressure vessel; an electrically conductive gas adsorptive material located within the pressure vessel; and an electric power supply electrically connected to said adsorptive material. The adsorptive material can be a carbon fiber composite molecular sieve (CFCMS). The systems and methods provide advantages in that both a high energy density and a high ratio of delivered to stored gas are provided.

Abstract: An adsorbent filter including compression molded particulate adsorbent construction is provided. The compression molded particulate adsorbent construction contains a particulate adsorbent and a sufficient amount of binder to retain the particulate adsorbent in a non-free flowing form. The adsorbent filter preferably includes a compression molded particulate adsorbent construction as described, positioned within an outer, porous cover. Preferably the outer, porous cover includes expanded porous polytetrafluoroethylene. In certain preferred applications, the adsorbent filter is positioned within a housing defining an internal volume and including therein electronic component(s), such that the adsorbent filter protects the internal volume of the housing, and components therein, from damage. The typical application is as a disk drive adsorbent filter. A preferred method for preparing an adsorbent filter according to the present invention is provided.

Abstract: The present invention includes a filter, 10, for purifying smoke plume generated from electrocautery or laser surgery. The filter includes a pre-filter, 11, for filtering gross particulate; a first filter, 12, having a structurally blended antimicrobial agent and adapted to capture and destroy minute and harmful organic particles such as viruses or bacteria at high efficiency; a second filter, 13, having a charcoal bed for removing gaseous toxins and odors from the smoke plume and a post-filter, 14, adapted to complete the general filtering process and to control the migration of any charcoal fines or other filter elements. The filter is adapted to be used in connection with various filter containers or hoods, including a rectangular hood, 16, or an industry-standard cylindrical filtering container, 20.

Abstract: An open-pore polyurethane foam support body (20) is impregnated in a single step with a solution of a thermoplastic adhesive dissolved in a solvent that is also a foam expander, or in two sequential steps first with a foam expanding solution and then, after the foam has expanded, with a solution of a thermoplastic adhesive, to form an adhesive layer (40) on the surfaces (25) within the pores (22) and passages (24) of the foam body (20). Sorbent particles (30) of activated carbon are introduced into the expanded pores until the expanded foam is packed to the desired density of carbon particle loading. The impregnated and loaded foam is then air dried at room temperature to evaporate the foam expanding solution until the foam body contracts to substantially its original volume.