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4415342 Air pollution control process  
An air pollution control process employing an improved rotatable collector, which by its position becomes a filtering and adsorbing station and a combustion and desorbing station, and an oxidizer...
4411948 Air filter of three-dimensional mesh-structured webs  
Air-cleaning filter element prepared by applying a pressure-sensitive adhesive agent to at least a pair of three-dimensionally mesh-structured elastic-flexible webs, disposing evenly an adsorbent...
4406678 Dust collector for vacuum cleaner  
A dust collector for a vacuum cleaner having a blower has an outer wall with an air-impermeable main portion bounding an inner chamber and a limited air-permeable portion, a filter accommodated in...
4392876 Filter packing  
A filter packing of electrostatically spray formed microfibers, the structure of which is a foamed coating layer containing open cell pores completely surrounding a nonporous fiber core. The pores...
RE31285 Method for manufacturing a filter of electrically charged electret fiber material and electret filters obtained according to said method  
A method for forming a filter of electrically charged electret fiber material, consisting of a high molecular weight, nonpolar polymeric substance, comprising drawing, charging, and fibrillating a...
4386948 Filter drive  
A filter device used to filter medical anesthesia gases and other inhalable respiratory gases. The filter device has a ported housing, and a filter member within the housing. The filter member is...
4378980 Gas borne particle filtering apparatus  
A gas borne particle filtering apparatus having a filter medium (13) with inlet and outlet openings (11, 12) in a staggered sawtooth cross-sectional configuration (140, 141) in a casing (10) for...
4364759 Methods for preparing anisotropic hollow fiber membranes comprising polymer of acrylonitrile and styrene and hollow fiber membranes produced therefrom  
Anisotropic hollow fiber membranes comprising polymer of acrylonitrile and styrene are prepared by extruding a solution of a hollow fiber-forming polymer comprising polymer of acrylonitrile and...
4361619 Filter of poly(tetrafluoroethylene) and glass fibers  
65-99 percent by weight poly(tetrafluoroethylene) fibers and 1-35 percent by weight glass fibers are combined in an intimate blend suitable for the preparation of filter felts having reduced...
4350507 Respirable particle sampling instruments  
A respirable particle sampling instrument passes air with a fan through a passage having first a pre-filter thereacross to collect non-respirable airborne particles and then a main filter to...
4344775 Method for separating gases liquid droplets and/or solid particles from gases or vapors  
Undesired substances are removed from a gas or vapor stream containing same by a gas-vapor treating mat composed of glass fibers intermixed with micro-bits of any of an expanded thermoplastic...
4342811 Open-celled microporous sorbent-loaded textile fibers and films and methods of fabricating same  
Textile quality polymeric fibers and thin films that are highly sorbent for organic and other vapors, mists and solutes. The fibers and films comprise a polymeric matrix with a system of...
4340402 Disposable air filter  
A dual filter system for heaters and airconditioners comprising releaseably securable throwaway secondary filter secured to a disposeable or permanent primary filter.
4334901 Respirator cartridge  
Lower inhalation resistance in respirator cartridges designed for protection against aerosols is accomplished with lower production cost and improved design distributing aerosol loading over...
4324574 Felt-like layered composite of PTFE and glass paper  
A felt-like layered composite of the following structure: a. a first layer of a predominantly horizontal coplanar superimposed layers of filamentary polytetrafluoroethylene components interrupted...
4303420 Air treatment apparatus  
An air treatment apparatus for removing particulate matter and contaminants from a flow stream of air includes an air inlet chamber coupled to an air inlet duct and two spaced-apart air flow...
4297116 Apparatus for separating foreign matter from a gas stream  
A separator is described which includes an elongate vessel defining a chamber having a wall therein dividing the vessel into a gravity chamber and a filter chamber with the gravity chamber...
4296163 Fibrous composite having elasticity  
A fibrous composite comprising a coalesced assembly of (A) a sheet-like mesh structure composed of fibers of a synthetic elastomeric polymer, the individual fibers being interconnected at random...
4295868 Filter for cleaning hot gases  
In an apparatus for cleaning hot gases a filter housing has an inlet for unfiltered gas and an outlet for filtered gas. A plurality of filtered inserts are placed within the housing in a manner...
4296166 Air filter of polyurethane mesh containing carbon adsorbent  
Air-cleaning filter element prepared by applying an adhesive agent such as a synthetic rubber latex to at least a pair of three-dimensionally mesh-structured elastic-flexible webs, disposing...
4293378 Enhanced wet strength filter mats to separate particulates from fluids and/or coalesce entrained droplets from gases  
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...
4289513 Activated sorbtion paper and products produced thereby  
This invention relates to a sorbtion paper which comprises a fibrous base paper material which is resiliently flexible and which is further characterized by being substantially free from loose,...
4286977 High efficiency particulate air filter  
An air filtration mat formed from a mixture of certain proportions of glass micro-fibers, an intimate blend or cobeat of cellulose fibers and micro-bits of an expanded, non-brittle polystyrene,...
4274914 Filter material  
A non-woven cellulose ester fibrous filter sheet material comprising cellulose ester staple fibers and cellulose ester fibrets which exhibits improved filtration properties and the method of its...
4270935 Filter assembly for high temperature glass fiber filter media  
An improved filter assembly for high temperature dust collection operations including a rigid cylindrical open framework retainer member depending from an aperture in a tube sheet separating dirty...
4266829 Combined rotating bed scrubber and water eliminator  
A device used as a combined scrubber and water droplet eliminator which may be employed in removing particulate from air, especially in conjunction with an underground mining machine. The scrubber...
4257791 Filter  
There is provided a filter wherein the filtering means has a non-woven needled textile filter fabric with an overall bulk density of at least 6 pounds per cubic foot and bulk density gradient such...
4251239 Multi-purpose ceramic element  
A ceramic sponge made from plastic is described. Because of the ease of cutting the plastic in various shapes before converting to ceramic several unique applications are possible. In case of a...
4237780 Hydrocarbon fume disposal system particularly for use in paint spray booths  
A prefilter and a filter are made from wood chips, and carbonized wood chips respectively, and the filters are employed to remove hydrocarbon fumes generated in paint spray booths. The filters are...
4235608 Rotary-type counter-current heat exchanger  
A heat exchanging element for use in a rotary-type counter-current heat exchanger is provided. The heat exchanging element comprises a gathering member composed of natural fiber, especially...
4229187 Movable, continuously changing, self-charging electrostatic filter  
A non-woven, relatively thin filter media is formed of fine denier fibers wherein the media exhibits the characteristics of developing an electrostatic charge in the presence of a substantially...
4227899 Absolute fluid filter  
The novel filter, according to an embodiment thereof, comprises a filter matrix formed into a specific geometry and made of glass, metal, mineral and/or cellulostic fibers, or fibers or...
4225642 Raised and fused fabric filter and process for producing the same  
A fabric filter having a low pressure drop, a high collection efficiency and an excellent cleanability is produced by raising one surface of a woven or knitted fabric comprising thermoplastic...
4215682 Melt-blown fibrous electrets  
A persistent electric charge is introduced into melt-blown fibers during the melt-blowing process. When these charged fibers are incorporated into fibrous webs, they provide unique properties,...
4207291 Ozone removal filter having manganese dioxide coated thereon  
Filter for removal of ozone from air, e.g. in aircraft cabins, comprising a porous and preferably light weight and thermally stable substrate, particularly an organic polymer such as...
4197100 Filtering member for filters  
A filter assembly for the filtration of a liquid or gaseous substance comprising a frame and a plurality of filter members fitted in the frame in parallel relation to one another. Each filter...
4194945 Filtering material and process for producing same  
The invention relates to a filtering material and a process for producing same. The proposed material can most advantageously be used in filter elements of internal-combustion engines, ventilation...
4187390 Porous products and process therefor  
This invention provides a tetrafluoroethylene polymer in a porous form which has an amorphous content exceeding about 5% and which has a micro-structure characterized by nodes interconnected by...
4185972 Electric charge holding structure for electretized air-filter medium  
The present invention is an improvement in electretized filtering means. This is an electric charge holding structure wherein the filter medium is covered on two opposite sides with an...
4186101 Filter  
A self-supporting filter consisting of a plurality of fibre flakes distributed as fibre cells throughout a matrix. The matrix is preferably made of a porous material. The fibre flakes are...
4181514 Stitch knitted filters for high temperature fluids and method of making them  
A dimensionally stable filter structure for high temperature applications and method of making it. The filter structure comprises at least one batt of relatively brittle fibers, known to possess...
4181513 Carbon adsorptive filter material with layers of reinforcing non woven fabrics needle punched  
An adsorptive filter material having deodorizing, degassing and decolorizing properties which comprises an adsorptive sheet layer of active carbon fibers of which the active carbon fiber content...
4178161 Manufacture of rigidized convoluted foam from flexible polyurethane foam and resultant product  
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...
4169911 Porous carbon fiber material with a thin metal film covering each fiber  
Porous material comprising a plurality of intersecting cut carbon fibers each having a diameter of 3 to 20 microns, the fibers being covered with a thin metal film and being substantially...
4164400 Filters  
There is provided a filter wherein the filtering means has a non-woven needled textile filter fabric with an overall bulk density of at least 6 pounds per cubic foot and bulk density gradient such...
4157376 Process for purification of gases  
A process for the removal of hydrogen fluoride and/or hydrogen chloride from gases comprising passing the gas to be purified through anion-exchange sorbent composed of a textured chemisorption...
4153505 Sorbent materials  
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...
4153433 Method and apparatus for filtering out solid particles from a gas with peat litter  
Method and apparatus for filtering a gaseous medium such as welding gas to remove solid particles therefrom. The gaseous medium is passed through a bed having at least two strata of peat litter,...
4141703 Air-pollution filter and face mask  
A flexible polymeric mask, which covers the mouth and at least the lower part of the nose, has exhale-valve means and vertical supporting means for air-intake filter means. The filter means...
4129430 Filter assembly  
A filter assembly which includes spaced first stage resin bound fibrous filter members with a second stage fine filter member spaced between the first stage members to form plenum chambers on...