Abstract: A surface discharge air cleaning device includes an insulating dielectric body, a discharge electrode formed at the upper surface of the insulating dielectric body, and a ground electrode formed at the lower surface of the insulating dielectric body, the discharge electrode being formed of a closed pattern and at least one non-pattern part, at which the electrode is not formed being disposed in the closed pattern, therefore a uniform and stable plasma formation is accomplished, and the number of hydroxyl radicals and negative ions is increased while the amount of ozone is decreased.

Abstract: The distance between a discharge electrode and a counter electrode of a discharge device is set to not more than 10 mm such that a streamer discharge is caused between the electrodes. The frequency of sound made by the streamer discharge is raised to 6 kHz or higher to exceed the frequency range which is easily perceivable by human hearing.

Abstract: A plane type electric precipitator includes an electrode plate of plane shape, made of electricity-conducting material; a collecting plate, parallel to the electrode plate and made of electricity-conducting material; a plurality of electrode units, placed on the electrode plate and having tips; wherein direct electric voltage is applied between the electrode plate and the collecting plate, so that air passing through is exposed to high electric fields close to the tips of the electrode units, ionizing suspended particles and trapping ionized particles at the collecting plate, so that an air-cleaning effect results.

Abstract: An electrostatic precipitator reduces contamination of the ground electrode by separating charging and collection stages.

Abstract: Disclosed is an air purifier with a small size, having an excellent air purifying capacity, capable of preventing a large amount of ozone from being generated, the ozone harmful to a human body. The air purifier includes a case, a pair of discharge electrodes provided at upper and lower parts of the case, a ground electrode provided between the pair of discharge electrodes, a pair of insulating dielectric layers provided on upper and lower surfaces of the ground electrode, and a power source coupled respectively to the ground electrode and the discharge electrode so as to supply voltage thereto.

Abstract: An improved filter element for use in an electrostatic precipitation air cleaning device, the filter element including rod electrodes arranged through a stack of alternating fluted plastic sheets and plate electrodes. Successive plate electrodes are arranged to make contact with an alternating one or the other of the rod electrodes. The plate and rod electrodes may be composed of high impedance materials such as paper and plastic, respectively. An arrangement for removably inserting a filter element into an air cleaning device is provided. The arrangement also removably provides electrical connectivity between the filter element and the air cleaning device. The filter element can thus be readily removed and re-installed by a user.

Abstract: An electro-mechanical electrostatic air cleaner that combines a low air resistance dielectric fibrous filter material positioned between and electrically charged by two electrically resistant carbon coated screens. The screens are charged by a remotely mounted bi-polar power supply. A pair of post ionization electrodes charge particles in the air with opposite charges, causing the particles to agglomerate. A plurality of screens may be placed in an array for increased one-pass filtration.

Abstract: A cyclone dust-separating apparatus in which the electrical field and particle charge can be uniform and stable. The cyclone dust-separating apparatus comprises: a cyclone body; an air intake pipe, through which air flows from outside into the cyclone body; an air exhaust pipe, through which air flows out of the cyclone body; a grounding member installed on the inside surface of the cyclone body; a plurality of discharge electrode members installed on the air exhaust pipe; and a high voltage power source connected to the air exhaust pipe. The air exhaust pipe conducts electricity, and the discharge electrode members are installed on one or more sides of the air exhaust pipe, are needle-shaped, and protrude from the outer surface of the air exhaust pipe so as to form a uniform and stable electrical field.

Abstract: The apparatus for decomposing PFCs includes an external electrode unit which is coupled to a reference voltage and which defines a flow space for the flow of the PFCs, and an internal electrode unit which is located within the flow space of the external electrode unit so as to define a reaction space between the internal electrode unit and the external electrode unit. The apparatus is also equipped with a voltage supply unit which applies an alternating voltage to the internal electrode unit which is of sufficient voltage and frequency to generate an electron beam within the reaction space which is capable of decomposing the PFCs.

Abstract: Ionic emission electrostatic device (1) for depositing on the surface (sp) of a multitude of aerosol particles (p1, p2, . . . , pn) within a fluid (F), a quasi-homogeneous quantity of ions (iq). This electrostatic device (1) is constituted by a conductive discharge corona electrode (EC) and a noncorona conductive receptor electrode (ER). The pseudo-planar active face (SA) of its receptor electrode (ER) is covered by a plurality of craters with sharp edges, in a closed pseudo circle, exhibiting on their end edges (Ai) a section of minimum bend radius, and enclosing the orifices (O1, O2, . . . , On) and terminating towards the outside of the active face (SA). The craters are distributed quasi-uniformly on the active face (SA), in its two geometric directions. The surface flow of ions (iq) originating from the corona electrode (EC) and in the direction of the active face of the receptor electrode (ER) has an increased homogeneity.

Abstract: Disclosed is a filtration enhancement apparatus and an associated method. The apparatus includes a number of electromagnetic grids that are placed in series. The first grid conditions ambient particles to generate particles with both a positive and a negative charge. These charged particles are then delivered to a second and third grid wherein a low, medium, and/or high frequency alternating current is employed to force the positive and negative charged particles to collide and conglomerate with one another. The conglomerated particles are then sent into the ambient environment for subsequent filtration.

Abstract: A filtration system for filtering particulates from air. A plurality of point ionization sources are positioned in the proximity of the periphery of an air flow channel and being oriented to generate ions in the proximity of the air flow channel in a direction generally upstream from each respective one of the plurality of point ionization sources. A particulate collection surface is positioned within the air flow channel in a downstream direction from the plurality of point ionization sources. The particulate collection surface is electrostatically charged in an opposite direction with respect to ground than the electrical charge of the ions. An ion trap is positioned within the air flow channel between the plurality of ionization sources and the particulate collection surface. The ion trap is relatively electrically neutral as compared with the particulate collection surface and the ions.

Abstract: An oxygen separator for separating oxygen from ambient air utilizing a vacuum swing adsorption process has a mass of less than 2.3 kg. A carrier is mountable on a person to support the oxygen separator for ambulatory use.

Abstract: A multistage space-efficient electrostatic collector cleans a gas flowing therethrough along a gas flow path having a first stage provided by a first corona discharge zone along the gas flow path, and a second stage provided by a second corona discharge zone along the gas flow path and spaced along the gas flow path from the first corona discharge zone. A method is provided for increasing residence time within the corona discharge zone of gas flowing through an electrostatic collector.

Abstract: An apparatus for separating aerosols or particles from a gas stream composed of a flow housing through which the gas containing the components to be separated flows, a separator, which is arranged in the flow housing, and a corona electrode, which is provided upstream of the separator in the direction of flow. The corona electrode is located substantially outside the gas flow. An air volume stream from the corona electrode flows into to the gas flow to transport charge carriers generated by the corona electrode into a charging zone in the flow housing.

Abstract: In an ionizer of an exhaust gas ionization system for ionizing moisture-laden gases in a channel comprising a nozzle plate having circular nozzle openings through which the gases are conducted, a high voltage electrode support grid arranged downstream of the nozzle plate and having electrode pins extending toward the nozzle openings and carrying at their free ends star structures with a number of tips projecting radially toward the circumference of the nozzle openings and being electrically charged for ionizing the moisture laden gases flowing through the nozzle openings past the star structures, the nozzle openings are sufficiently large to cause the gas flow to be slow enough to permit water to flow down along the walls of the nozzle openings against the upward flow of the gases through the nozzle openings.

Abstract: A local cleaning system which uses a charged air shower unit for forming a shield curtain by means of an ion wind, and a local exhaust device for exhausting the air containing dirt and dust settled down on the floor by the ion wind to construct a clean shielded space with no need for a dedicated partition wall. With this local cleaning system, the charged air shower unit provides negative charges for gas molecules, and dirt and dust, floating microorganisms, odor constituents, and other foreign matters, for electrically neutralizing them, and leads the gas molecules and foreign matters which have lost the charges and which Brownian motion is suppressed, by means of the ion wind for effectively sucking them into the local exhaust device or air cleaner. Because a charged air curtain including an invisible ion wind provides a shield plane, a clean shielded space can be constructed with no need for a dedicated partition wall.

Abstract: An air cleaner has an electron generator that includes a pointed head, a collector element and an electric circuit included in the electron generator for generating a negative potential on the pointed head and a positive potential on the collector element. The pointed head is mounted at the free end of a cylinder of electrically non-conductive insulating material. The cylinder includes the electric circuit at the free end whereas its other end enters the collector element, which is cylindrical and is of electrically conductive material.

Abstract: A portable air filtration system includes a filter housing having an air inlet and an air outlet. The filter housing defines a filtration chamber between the air inlet and the air outlet. The portable air filtration system uses an ionizing mechanism, a filter media, and an electrode to filter air. The ionizing mechanism ionizes particles within the air to a negative charge. The filter media is disposed between the ionizing mechanism and the air outlet for entrapping the particles. The electrode is disposed between the ionizing mechanism and the filter media to establish an electric field. The electric field is established between the ionizing mechanism and the electrode adjacent to the filter media. The electrode is also electrically-connected to ground and to the filter media for dissipating the negative charge of the particles entrapped within the filter media.

Abstract: An analytical instrument device is provided which can be used for analyzing industrial gas and air emissions. The device is operative to accumulate aerosols from gases and includes an atomizer connected to a gas pumping system, a needle, and a high-tension power supply. The atomizer includes a hollow cylinder provided with a dosing hole which is arranged in the central part of a lateral surface thereof. The gas pumping system includes a dosing hole of the atomizer with a needle arranged therein. The needle is provided with a movable platform for moving it in relation to the atomizer. An orthogonal system used for introducing the gas flow through the dosing hole of the atomizer makes it possible to essentially increase (by 6 times) a pumping speed and correspondingly to reduce the time of a sample accumulation.

Abstract: An adjustable eddy electrostatic precipitator, including a main body, an electrode array, an adjustable opening and a precipitating device. The main body has an inner space with an air guiding plate of helical shape, an entrance for air and an exit for air. The electrode array is placed close to the entrance, ionizing air as well as particles floating therein. The adjustable opening is located at the exit, having an adjustable aperture. The precipitating device is connected with a bias high voltage for adsorbing ionized particles. Air entering the main body through the entrance is ionized, ionizing particles floating therein. Ionized particles are driven towards a single zone and are collected depending on size and charge in an adjustable manner.

Abstract: Air-treatment apparatus and methods are disclosed that are especially suitable for treating the air in a room or other dwelling or working space. An apparatus embodiment of the subject apparatus includes a housing having air-intake and air-output openings. A gas-filter assembly inside the housing receives air entering the air-intake opening and includes a dual-media filter element having a matrix of fibers to which particles of activated carbon are adhered at mutual points of contact without using an extraneous binder. As air passes through the gas-filter assembly, the carbon particles adsorb odor compounds from the air. At least one electrostatic 3-dimensional (E3D) filter assembly downstream of the gas-filter assembly includes a respective charging element sandwiched between dielectric-fiber filters sandwiched between two respective electrically conductive screens. The screens are electrically grounded while the charging element (which is conductive) is connected to a source of high-voltage DC power.

Abstract: An air purifier device includes a fan unit in an electrically conductive housing for drawing ambient air into the housing via an air inlet, and an electrically conductive dust-collecting member in the housing and disposed adjacent to an air outlet. A detecting unit is operable so as to provide a control signal in response to at least one of a change in electrical characteristics of the housing due to body contact therewith, and a change in electrical characteristics of the dust-collecting member due to excessive accumulation of dust thereon. A power control unit is operable to supply electric power to a negative ion generating unit such that a drive voltage is applied to an ionizing member of the negative ion generating unit, and is responsive to the control signal from the detecting unit to interrupt supply of the electric power to the negative ion generating unit.

Abstract: A multi-stage collector of the type used to collect particles from industrial gas. The collector can contain multiple narrow and wide zones formed by a plurality of parallel corrugated plates. Contained in the narrow zones can be elongated electrodes with sharp leading and/or trailing edges. These electrodes can provide a non-uniform electric field near their sharp edges leading to corona discharge. The corona discharge causes particulate matter in the gas flow to become charged. The region in narrow zones away from the sharp edges of the electrodes resembles a parallel plate capacitor with relatively uniform electric field. In this region, particles can be collected on the plates and on the electrode. Wide regions can contain barrier filters (bag filters) with conductive surfaces. The collector can also be used to clean inlet gas in gasification plants and to collect re-usable materials from a gas stream.

Abstract: An electrostatic filter (1) has a chamber (11) into which a gas stream is introduced. An ioniser (19) in the form of an electrode array (20) is located in the chamber (11) and creates an ionising zone through which the gas stream passes. A charged outlet (21) is located downstream from the ioniser (19). As the gas stream passes through the ionising zone, the unwanted particles therein are charged and urged away from the outlet (21) by the ioniser (19). Charged particles approaching the outlet (21) are also electrostatically repelled therefrom, permitting “clean” gas to be extracted through the outlet.

Abstract: Fine particles of dust and other pollutants in gas streams are agglomerated to form larger particles which are more easily filtered in downstream processing. In one embodiment, particles in successive portions of the gas stream are charged with opposite polarity, and the gas stream is introduced into an Evasé portion (12) to slow it down. Particles of different sizes have differential deceleration and therefore mix generally in the direction of flow, leading to agglomeration of oppositely-charged particles. In another embodiment, a gas stream is divided into substreams in respective parallel passages, and the particles in adjacent passages are charged to opposite polarity. Deflectors at the downstream end of the passages cause substreams of particles of opposite polarity to mix, with resultant agglomeration of oppositely charged particles.

Abstract: In an apparatus for the purification of a gas which apparatus includes a three section conduit with an ionization and cleaning section in which particles contained in water-saturated air are ionized and then conducted through a chamber with grounded walls so that part of the particles are deposited on these walls, an additional cleaning section which includes grounded tubes past which the gas is conducted to remove additional charged particles and a filter section in which dry remaining fine particles are removed from the gas stream, the deposited particles are flushed from all three sections and the flushing water including the particles is cleaned and recycled.

Abstract: A particle precipitation device for removing particles entrained in a gas stream includes an array of passages through which a gas stream can be directed relatively freely. The passages are provided between plastics walls adapted to create an electrical field within the array. The plastics walls may have areas of conductive material in contact therewith. High and low electrical potentials alternately applied to isolated areas of the conductive material provide charged sites in the array for collecting particles from the gas stream. Alternatively, the plastics walls may have electret properties.

Abstract: An improved method is disclosed for cleaning a flow of gaseous fluid, such as room air, from particles present in the fluid, the gaseous fluid being ionized, and using a conductive grid placed across and upstream of the filter for protecting the filter from being charged by free ions. An air purifier filter cartridge using the ion-intercepting grid of the invention is also disclosed. The grid may be connected to or electrically insulated from the ionizer ground potential, with equal effect.

Abstract: A filtration system for filtering particulates from air. A plurality of point ionization sources are positioned in the proximity of the periphery of an air flow channel and being oriented to generate ions in the proximity of the air flow channel in a direction generally upstream from each respective one of the plurality of point ionization sources. A particulate collection surface is positioned within the air flow channel in a downstream direction from the plurality of point ionization sources. The particulate collection surface is electrostatically charged in an opposite direction with respect to ground than the electrical charge of the ions. An ion trap is positioned within the air flow channel between the plurality of ionization sources and the particulate collection surface. The ion trap is relatively electrically neutral as compared with the particulate collection surface and the ions.

Abstract: A particle precipitation device for removing particles entrained in a gas stream includes an array of passages (10) through which a gas stream can be directed relatively freely. The passages are provided between plastics walls adapted to create an electrical field within the array. The plastics walls may have areas of conductive material (1, 2) in contact therewith. High and low electrical potentials alternately applied to isolated areas of the conductive material provide charged sites in the array for collecting particles from the gas stream. Alternatively, the plastics walls may have electret properties.

Abstract: This disclosure relates to a method for deaerating a liquid layer such as a coating solution using electrostatic forces. A flow of charged particles is created above and moved towards a low conductivity liquid layer. The flow of charged particles causes localized thinning of the liquid layer which facilitates the removal of bubbles of entrained gas from the liquid by bringing those bubbles closer to the exposed surface of the liquid and rupturing them at that surface. This electrostatic deaeration technique is combined with other non-electrostatic liquid layer thinning techniques or degassing techniques to further facilitate removal of bubbles from the liquid in preparation of further processing of the liquid. The liquid layer may be stationary or flowing with respect to the application of charge particles.

Abstract: The invention relates to analytical instrument-making engineering and can be used for analysing industrial gas and air emissions. The aim of said invention is to increase the sampling efficiency and to reduce, correspondingly the time of sampling. The inventive device for accumulating aerosols from gases comprises an atomiser connected to a gas pumping system, a needle, and a high-tension power supply. The atomiser is embodied in the form of a hollow cylinder provided with a dosing hole which is arranged in the central part of a lateral surface thereof. The gas pumping system comprises a dosing hole of the atomiser with a needle arranged therein. Said needle is provided with a means for moving it in relation to the atomiser. An orthogonal system used for introducing the gas flow through the dosing hole of the atomiser makes it possible to essentially increase (by 6 times) a pumping speed and correspondingly to reduce the time of a sample accumulation.

Abstract: A method for cleaning air utilizing an air cleaner which is smaller than conventional air cleaners, wherein a filter is formed on the peripheral portion of a disk and the filter is bent into a wave-shape such that irregularities of the wave are formed in the radial direction of the disk, so that air existing on the inside area of the disk is discharged to the outside of the disk through the filter.

Abstract: The invention relates to a method to clean air for separating materials in the form of particles and/or droplets from a gas flow. The gas flow is directed through a collection in which the outer walls are grounded, and in which high voltage is supplied to the ion yield tips arranged in the collection chamber. Thus an ion beam from the ion yield tips towards collection surfaces is established to separate desired material from the gas flow. The electrically conductive collection surfaces are electrically insulated from the outer castings and high voltage is supplied to the collecting surfaces, in which the direct-current voltage has an opposite sign as the high voltage directed to the ion yield tips. The collection surface is totally conveniently and rapidly detached for clean material replacement.

Abstract: The invention relates to an electrostatic precipitator for collecting liquid or solid particles from a gas stream. The electrostatic precipitator consists of a tube (1), through which the gas to be cleaned flows longitudinally, the internal wall (1A) of the tube forming a precipitating electrode for the particles to be collected. An internal electrode (2) extending in a lengthwise direction is disposed concentrically inside tube (1), a high electrical voltage being present in the space between this internal electrode and the precipitating electrode. On the inlet side, internal electrode (2) has a first section (2A) with a small cross-sectional area, and on the outlet side, a second section (2B) with a comparatively larger cross-sectional area. The function of the first section is essentially to form a corona while that of the second section is essentially to form an electrostatic collecting field.

Abstract: A dust is electrostatically charged using an ion-releasing device adapted to release only ionized air with occurrence of a corona discharge, thereby reducing the amount of power consumed and the amount of ozone generated to the utmost. An electric dust collector includes a charging section having a discharging electrode and an earthed electrode, a dust-collecting section having a voltage-applied electrode and an earthed electrode and an air feed fan. Dust introduced into the dust collector is electrostatically charged by breaking the air insulation by a corona discharge occurring in the charging section to produce ionized air and then removed in the dust-collecting section where an electric field is formed. However, because the corona discharge is generated, there is a problem that the discharged current is large, and the amount of power consumed and the amount of ozone generated are large.

Abstract: The invention relates to a method and device for separating materials in the form of particles and/or drops from a gas flow, in which method the gas flow is directed through a collection chamber the outer walls of which are grounded, and in which high tension is directed to the ion yield tips arranged in the collection chamber, thus providing an ion flow from the ion yield tips towards the collection surfaces, separating the desired materials from the gas flow. It is characteristic of the invention that the collection surfaces conducting electricity are electrically insulated from the outer casings; and that high tension with the opposite sign of direct voltage as the high tension directed to the ion yield tips is directed to the collection surfaces. According to an embodiment of the invention the electrical insulation is made of ABS, and the surface conducting electricity comprises a thin chrome layer arranged on the insulation layer.

Abstract: In accordance with the present invention, there is provided an air purification device including: a first electrode in the shape of a hollow cylinder having both ends open; a second electrode in the shape of a solid needle having a tip end portion of a predetermined length including a pointed tip; a dielectric member covering the second electrode except the tip end portion; and a power supply for applying a high voltage across the two electrodes in order to create a corona discharge, for generating ozone and ion wind. The dielectric material may be of any type of silicone or plastic (including epoxy) as long as it is inexpensive and easy to mold. The dielectric member is, for example, in the shape of a circular flange, providing ease of maintenance and safety measures as well as permitting effective airflow.

Abstract: A sintered stainless steel filter is used as the grounded electrode of a point-to-plane electrostatic precipitator. Particles flow through, rather than parallel to, the collection plate. Particle collection efficiency is empirically shown to increase as the charged particles are drawn closer to the grounded filter. The utilization of stainless steel fiber filter provides (1) low particle penetration (high particle collection efficiency) of different particle range, (2) applicability to all different particulate components, (3) high loading capacity but low pressure drop (less energy and maintenance needed), (5) low electric voltage for operating the system, and (6) low cost and small dimension.

Abstract: The present invention relates to an apparatus for controlling the behavior of particulate matter such as mist and dust occurring in the manufacture of paper and board. A web (1) is passed to web treatment equipment (22, 23) wherein at least one treatment step is applied to the web (1) causing the emission of said particulate matter (24). In the vicinity of the emission point (21) of said particulate matter are placed at least two electrodes (25, 26) and at least one electrode, called a counter-electrode (26), is at a low potential. Further, at least one electrode (25) is at a potential higher than that of said counter-electrode (26), and the potential difference between said electrodes (25, 26) is made so high as to generate a corona discharge between said electrodes that causes an ion-blast wind toward the electrode (26) of the lower potential, said ion-blast wind being capable of transferring particular matter, which enters the gap between said electrodes, toward said electrode of lower potential.

Abstract: An air cleaner includes a fan unit (1; 1′) and a filter unit (3) that is entirely replaceable, where the fan unit (1; 1′) and the filter unit (3) are mutually connected by a quick coupling and the filter unit includes a filter and an exterior casing that defines an exterior of the air cleaner when the air cleaner is in an operating position.

Abstract: The present invention describes a method and an arrangement for purifying the intake air of a gas turbine of solid particles and liquid droplets. According to the invention air is taken into the system of intake air passages (1, 2, 4) of the gas turbine and the particles contained in the intake air are collected by means of at least one plate filter (3) to which a collection voltage has been connected. In order to enable and enhance collection, the air is taken into at least one charging chamber (2) arranged at a distance prior to the plate filters (3) in the flow direction of the air, where an electric field is formed between at least two electrodes (5, 7) by connecting a voltage between the electrodes which exceeds the collection voltage, whereby powerful charging of the particles and at least partial removal of the water contained in the air are effected.

Abstract: A multi-stage particulate matter collector of the type used to collect particles from waste industrial gas. The collector can contain multiple narrow and wide zones formed by a plurality of parallel corrugated plates. Contained in the narrow zones are elongated electrodes with sharp leading and/or trailing edges. These electrodes provide a non-uniform electric field near their sharp edges leading to corona discharge. The corona discharge causes particulate matter in the gas flow to become charged. The region in narrow zones away from the sharp edges of the electrodes resembles a parallel plate capacitor with relatively uniform electric field. In this region, particles can be collected on the plates and on the electrode. Wide regions can contain barrier filters (bag filters) with conductive surfaces. The electric field is also relatively uniform in this region causing electrostatic collection on the plates and filter surface.

Abstract: An apparatus for removing particles from a gas in a high purity flowing gas system is provided which includes a flow tube inserted inline in the flowing gas system having an inlet and an outlet, a pressure sealed, electrically insulated feed-through integral to the flow tube, an emitter inserted through the feed-through into the flow tube to create a plasma in the gas to charge particles in the gas, and a collector surface in proximity to the emitter; whereby an electric field between the emitter and the collector surface draws the particles in the gas to the collector surface.

Abstract: An air-cleaning apparatus and air-cleaning method whereby air is cleaned with an air flow containing ions and ozone generated by corona discharge. The apparatus has a wind tunnel part including a trumpet-shaped member (3) having an opening at the bottom thereof and a cylindrical member (4) connected to the opening at the bottom of the trumpet-shaped member (3). The wind tunnel part has a titanium dioxide metal evaporated onto the surface thereof. A needle electrode (1) is placed in front of the trumpet-shaped member (3) of the wind tunnel part near an axis of the trumpet-shaped member (3). An annular electrode is formed on the inner surface of the wind tunnel part. A high-voltage generating unit applies a high voltage between the needle electrode (1) and the annular electrode (2). A housing (10) accommodates the needle electrode (1), the annular electrode (2) and the wind tunnel part and has an air inlet (11) on a side thereof closer to the needle electrode.

Abstract: An electric dust collecting unit disclosed herein includes a corona discharging portion for giving rise to corona discharge to electrically charge cigarette smoke particulates, toner, and other floating particulates in air, an electric collecting portion disposed on a leeward side of this corona discharging portion, for electrically collecting the floating particulates charged at the corona discharging portion, and a box-type frame with its opposite surfaces opened, in such a configuration that the corona discharging portion has a plurality of needle electrodes which is disposed in such a way that their respective needle tips may be directed toward the leeward side (that is, with their backs directed toward a front face opening in the box-type frame).

Abstract: Ionizing apparatus includes a housing that supports a plurality of ionizing electrodes disposed within fluid apertures that are connected via tubing conduits to pass fluid therethrough about the electrodes. Gas to be ionized is supplied under pressure to the apertures transporting gas ions generated at the electrodes in response to high ionizing voltage supplied thereto. To clean the ionizing apparatus, cleaning liquid is supplied under pressure in one flow direction through the tubing conduits and apertures to remove particles from within the tubing conduits and apertures and from surfaces of the electrodes.

Abstract: The present invention provides for an apparatus for protecting transmissive surfaces from infectious airborne agents. The apparatus comprises a means for providing and directing a sterile flow of charged breathable gas in the form of an electrohydrodynamic flow over a transmissive surface; and means for influencing the movement of said electrohydrodynamic flow for protecting said transmissive surface.

Abstract: An ionizing structure for ambient air treatment wherein the structure, optionally having ceiling-mounting provisions, incorporates an ionizing element forwardly directed in the direction of airflow through the structure, an electrical power supply coupled to the ionizing element for applying thereto a stepped-up, negative, direct-current voltage of the order of several thousand volts, and a buffer, in effect, in the form of electrical circuit means, e. g. a filter, operatively interposed between the power supply and the blower for preventing feedback of eddy-voltage spikes, transients and the like as may be generated in the power supply to the operative parts of the blower, thus preventing damage to the blower.