Abstract: A liquid-injected compressor with at least two cooperating compressor elements (2 and 3) is provided. The compressor elements are mounted in a housing (1). At least one of the compressor elements is rotatable and is bearing-mounted with a shaft end (7, 8, 13, 14) in the housing (1). The compressor is provided with an inlet (22) and an outlet (17-18-19) which are connected to the inside of the housing (1). The shaft end (14) of the rotatable compressor element (3) is situated in the outlet (17-18-19) in the housing (1). At least one body (20 or 41), made of material which is permeable to gas, is fixed on this shaft (14), forming a filter which practically entirely seals the outlet (17-18-19) and only lets the compressed gas through.

Abstract: A filter system utilizing a coalescing-type filter element with at least one end cap and a transport layer such that contaminants are filtered from a gas stream, coalesced and drained from the filter element completely exterior to any other component of the filter element. The filter element includes a drainage sleeve which may extend over and exterior to at least one end cap. The filter element may include a transport layer disposed exterior to a drainage layer extending between end caps. The present invention further includes a method for decontaminating a gas stream utilizing the filter system and filter element.

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.

Abstract: An air filter suitably usable in an air cleaner, room air-conditioner or especially in car air-conditioners in which air is driven at a high speed. The air filter is made of a pleated polyurethane foam having on one or both sides thereof a three-dimensional network skeletal structure of micro cells.

Abstract: An odor filter for exhauster hoods, which filter includes an adsorption filter bed regenerable by washing. The filter bed is made of a highly air-permeable substrate material and an adsorbent affixed thereto in the amount of 50 to 400 g/l by an adhesive mass and has a mean particle diameter between 0.2 and 2 mm.

Abstract: The invention relates to a method of treating reticulated foam with a controlled migration treatment medium to produce an improved air filter. Reticulated foam is treated with a highly viscous oil that protects the foam from hydrolytic degradation and increases efficiency of the filter without causing unacceptable air restriction of the foam. An improved air filter made from treated and untreated layers of reticulated foam is also shown.

Abstract: A supplemental cylindrical air cleaner or filter is provided for the inlet snorkel of a conventional automotive air cleaner housing and the supplemental air filter or cleaner incorporates a molded body of open cell material with said body including two elongated, upwardly opening semi-cylindrical halves including opposite side upper marginal edges with said halves disposed in side-by-side juxtaposed position with adjacent upper marginal edges of adjacent halves integrally formed and joined by a living hinge portion of said material extending therealong. The cylindrical halves include integral partitions or disks spaced therealong and projecting outwardly from the open sides of the halves with the partitions of one of the halves staggered relative to the partitions of the other half.

Abstract: An antimicrobial air filter has a layer of fabric bearing porous activated carbon particulate deodorizing agents, a layer of polymeric expanded foam filter media impregnated with a biostat type antimicrobial agent and a pleated sheet of HEPA filtration media treated with the biostat. The layers are assembled such that the biostat does not migrate into the porous carbon particulates. The filter may be used in central air conditioning and heating systems without the need for an air circulator in addition to those conventionally employed.

Abstract: A filter frame formed from a stock channel member having a generally U-shaped cross-sectional configuration. The channel member may be provided in stock lengths which may be cut on-site to the desired size to form each side of a filter frame when assembled together. The cut lengths of the channel members may be assembled together in the appropriate configuration to match the filter being replaced, and a mass of filter medium cut to a corresponding configuration and placed within the cavity formed by the u-shaped cross-section of the channel members to form the air filter. The channel members are also provided with a plurality of U-shaped grooves in the upstanding legs of the channel members which form tabs. The tabs may be advantageously employed with a length of elongated material to form a protective screen. Specifically, a length of elongated material, such as string, may be wound about the tabs and across the length of the air filter to be wound through separate tabs.

Abstract: A flow regulating mechanism for a gas emitting device featuring a microcellular polymer filter having connected, continuous bubbles through which fuel passes and independent air bubbles which expand with increases in temperature compressing and thereby restricting the flow of fuel through the connected, continuous bubbles.

Abstract: The filter of the present invention continually provides the passenger compartment of a vehicle with a supply of purified air, even in the most severe environmental conditions. The filter comprises an inlet surface, an outlet surface, walls which define a plurality of passages which extend from the inlet surface to the outlet surface, and a filtration means for removing the impurities from the fluid. The filter preferably can be subdivided into a plurality of layers, including an inlet layer, an intermediate layer, an outlet layer. Each layer includes a plurality of cells, the cells having walls with a generally curvilinear shape. A plurality of the passages are preferably in fluid communication with a plurality of other passages. Surface filtration is used to remove the impurities from the fluid flowing through the passages.

Abstract: The adsorption filter has a highly air-permeable, three-dimensional carrier framework essentially stable in shape, to which a layer of granular adsorber particles with a diameter of 0.1 to 1 mm is affixed. The carrier framework can be composed of wires, monofilaments or stays, the distance between them being at least twice as great as the diameter of the adsorber particles. The carrier framework can also be a large-pore reticulated polyurethane foam which has a weight of 20 to 60 g/l and pores with a diameter of 1.5 to 3 mm. In spite of a very slight pressure drop, the filter performance is excellent.

Abstract: A filter device having a plurality of filter elements and at least one flexible joint connecting the filter elements to each other. The filter elements are made of a substantially inflexible material and have connecting surfaces in parallel with a direction of air flowing through a passage in which the filter device is provided. One end of the flexible joint is connected to the connecting surface of one of the filter elements, and the other end of the flexible joint is connected to the connecting surface of the filter element adjacent thereto.

Abstract: The adsorption filter has a highly air-permeable, three-dimensional carrier framework essentially stable in shape, to which a layer of granular adsorber particles with a diameter of 0.1 to 1 mm is affixed. The carrier framework can be composed of wires, monofilaments or stays, the distance between them being at least twice as great as the diameter of the adsorber particles. The carrier framework can also be a large-pore reticulated polyurethane foam which has a weight of 20 to 60 g/l and pores with a diameter of 1.5 to 3 mm. In spite of a very slight pressure drop, the filter performance is excellent.

Abstract: A multipurpose filtering material particularly for use in electrostatographic reproducing apparatus has a foraminous support matrix having a plurality of interconnecting voids to permit low impedance to the flow of gaseous material but sufficient to trap particulate material entrained in the gaseous material which is coated with a thin dehydrated alkaline film of an alkali metal silicate to neutralize nitrogen oxide species in the gaseous material and has adhesively bound thereto a particulate neutralizer for another noxious gas the surface of which is substantially exposed to the flow of gaseous material. A filter may be placed in electrostatographic reproducing apparatus at the inlet or outlet of an air stream passing therethrough to neutralize nitrogen oxide species and ozone generated by the corona discharge device, and ammonia from the incoming air.

Abstract: This invention relates to a semiconductor wafer container having an air filter for removing fine particles from air, which serves to allow air to pass through a body of the container. This causes atmospheric pressure within and without the container body to be substantially identical to each other whereby dirty air is never introduced into the container body.

Abstract: What is disclosed is a method for preparing antimicrobially effective foams using certain silanes as co-catalysts, co-surfactants and antimicrobial agents to give soft, resilient, fine-celled foams that are capable of reducing the number of, or eliminating, microorganisms in all types of media. Such foams themselves are not susceptible to attack by the microorganisms. An example is the use of (CH.sub.3 O).sub.3 Si(CH.sub.2).sub.3 N.sup..sym. (CH.sub.3).sub.2 C.sub.18 H.sub.37 Cl.sup.- in a flexible polyurethane foam formulation to give a fine-celled, soft, resilient foam which is antimicrobially effective over a long period of time.

Abstract: An air filter comprising a first layer of reticulated foam plastic material having a thickness of between 10 mm and 20 mm and a porosity of between 5 and 60 pores to the linear inch, a second layer of reticulated foam plastic material having a thickness of between 6 mm and 10 mm and a porosity of between 60 and 100 pores to the linear inch, and at the interface between said first and second layers an open mesh substrate approximately one millimeter in thickness constricting a maximum of about ten percent of each of the first and second layers, the filter being impregnated with a flame proof retention and plasticizer additive, the first and second layers being bonded together at the interface.

Abstract: A process for producing dense membranes comprises allowing a solution comprising a polar polymer and/or a polar prepolymer in a polar solvent which is substantially soluble in a polar liquid to spread out over the surface of the polar liquid and allowing the spread out solution to desolvate. The dense membranes can be applied in supported membranes for use in gas separation processes.

Abstract: Polyurethane foams are employed to separate vapor of a volatile, organic liquid such as perchloroethylene from air or other gas containing the organic vapor. The absorbed, organic vapor can subsequently be recovered in liquid form by desorbing the vapor from the vapor laden foam and subsequently condensing the desorbed vapors.

Abstract: The invention provides an air cleaner assembly in combination with an engine having a blower housing with airflow circulating therethrough and a carburetor having an intake. The assembly comprises a duct having an inlet and an outlet with the inlet angularly disposed through the blower housing, an air cleaner housing having side walls and a bottom wall, and an outlet chamber having an inlet and an outlet in communication with the carburetor inlet. Within the air cleaner housing, a first interior wall is upstanding from the bottom wall and defines with certain side walls an intake chamber having an inlet communicating with the duct outlet, and a second interior wall upstanding from the bottom wall so that a filter chamber is formed between the interior walls having an outlet in its bottom wall so that the filter chamber and outlet chamber communicate through the filter chamber outlet and the outlet chamber inlet.

Abstract: A glass fiber filter mat possessing excellent wet strength which is in the form of a non-woven matrix of glass micro-fibers including polymer micro-bits derived, for example, from a non-brittle expanded, thermoplastic styrene polymer or a flexible foamed polyurethane, the micro-bits being substantially free of intact cells. Also included in the filter mat is a cobeat or intimate blend of cellulose fibers and the polymer micro-bits, which may additionally contain polyester fibers, as well as a combination of binders, viz., polyvinyl alcohol and a melamineformaldehyde resin.

Abstract: An apparatus which serves to clean air containing fine dust and also larger particles, such as fibrous material, thread ends, etc., which are produced in an industrial environment, especially a textile plant. In order to conduct a two-stage cleaning process without the necessity of dimensioning two filtering stages for the full air flow, there is provided a vortex chamber into which the unclean air is admitted tangentially or in some manner which produces a rotary flow with centrifugal force components which act on the larger particles in the air stream. The vortex chamber includes a rotating filter drum, the interior of which may preferably be provided with suction, causing air to flow from the vortex chamber through the filter, depositing thereon the fine dust carried by the incoming air.

Abstract: A crankcase vent apparatus comprises a stack having a lower end adapted for connection to a crankcase vent and an upper end having a filter therein and presenting an irregular opening to an air flow across the stack.

Abstract: A rigidized convoluted foam suitable as a self-standing filter is made by passing a sheet of air-permeable flexible polyurethane foam through a convoluting machine to obtain two unnested sheets of convoluted foam, each sheet being convoluted on only one side. The two sheets are nested and impregnated from the flat surface of each sheet almost to the closest valley surface with a thermosetting melamine, urea, or benzoguanamine resin in an amount to not appreciably impair the permeability of the foam and to increase the rigidity of the foam sufficiently so that each unnested sheet will be self-standing. After the resin has reacted, the nested sheets are separated.

Abstract: A composite sorptive material in the form of a self-supporting, fluid-permeable sheet of fibrous material having distributed throughout a powdered sorbent material. The sheets provide a simple and convenient way of handling and using powdered sorbent materials. Suitable powdered sorbent materials include activated charcoal and powdered sorbent foam which has been prepared by the pyrolysis of an aromatic nitrogen-containing compound.

Abstract: A device for recovering and using the hot, moist air exhausted from a clothes dryer is disclosed. The device includes a housing having a supply inlet, an exterior vent outlet and a heating outlet. Valve means are provided for selectively closing off the vent outlet so that hot, moist air may pass from the supply inlet to the heating outlet. A staged filtration system is supported within the housing for filtering the lint and other particulate matter from the hot, moist air as it passes from the supply inlet to the heating outlet. The heating outlet is connectable to an existing heating duct or the device may be vented directly into the interior of the building within which it is used.

Abstract: A layer of open cell polyurethane foam adhered to a layer of a non-woven fibrous material of fine porosity relative to the foam results in an efficient fluid (e.g., air) filtering medium having a high capacity for retaining particulate contaminants. The combined layers are useful as an air filter element.