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4126141 Filter and cigarette including a filter  
A filter for tobacco smoke comprises a porous substrate (other than tobacco) having a deposit thereon of particles of a water-insoluble hydrophobic moisture-laden substance, the major ingredient...
4119543 Filter medium and method of making same  
A filter medium particularly adapted for use in an oil filter for an internal combustion engine having a water-laid web of fibers, at least 70% of which are cellulose, impregnated with resin in a...
4115562 Treated fabrics and process  
Fabrics produced from aromatic sulfide polymers are rendered water-repellent by heat treatment near, but below, the melting point of the polymer for a finite period of time. The resulting...
4115082 Air cleaner assembly  
An air cleaner assembly of the flow through type has a central element of open cell foam rubber, such as foam polyurethane, two series of rigid thermoplastic rods sandwiching the central element,...
4106213 Exhaust recirculation system for clothes dryer  
A device for recirculating warm, moist air from a clothes dryer exhaust into a room is attached to the standard vent pipe of the dryer. The device comprises a length of corrugated, sheet aluminum...
4104170 Liquid filter having improved extended polypropylene element  
An improved filter of the cartridge type having concentric inner and outer filter elements is disclosed. The elements are formed of non-woven polypropylene fibers. In a preferred embodiment the...
4100323 Scrimless filter felt  
A scrimless, dimensionally stable filter felt suitable for high temperature gas filtration is comprised of at least 80% by weight poly(m-phenylene isophthalamide) staple fibers having at least a...
4093437 Air filter material  
An air filter material having the construction of (1) an upper fibrous layer to be disposed at upper-stream position of influent air, containing 50 to 70% by weight of small diameter polyester...
4056375 Gas filter element  
A gas filter element comprising a holding frame and a plurality of self-supporting wedge-shaped filter pockets each having its wide end open and secured to said frame, each element comprising a...
4056374 Tubular gas filter  
An improved tubular filter bag of two piece construction, one piece being coated with a flexible and abrasive resistant coating, the coated piece being in communication with a flow-through inlet...
4047914 Internally supported multi-stage sleeve filter  
A self-supporting, self-gasketing, multi-stage, variable density glass fiber sleeve filter is disclosed and includes a reusable internal wire frame with a composite, low velocity fluid entry...
4035164 Methods for removing charged and non-charged particles from a fluid by employing a pyrollectric filter  
Processes for attracting charged and non-charged particles from a fluid by means of a pyroelectric filtering medium.
4025679 Fibrillated polytetrafluoroethylene woven filter fabric  
The product of the present invention is a fabric woven from oriented polytetrafluoroethylene (PTFE) strands, in which the strands of the weave are interconnected by a multiplicity of fine PTFE...
4022596 Porous packing and separator medium  
A material is provided for use as a tower packing and/or as the separation medium in mist eliminators. Also provided are methods for producing the new material. The new material is comprised of...
4021382 Method for the preparation of hydrophilic spongy gels  
A method for the preparation of a hydrophilic acrylonitrile-containing polymer comprising admixing a solution of said polymer in 47% to 75%, preferably 50 to 72% concentrated HNO3, with solid...
4018678 Method of and apparatus for fluid filtration and the like with the aid of chitosan  
This disclosure is concerned with the use of chitosan as a coating or packing in fluid filtration and other systems to provide a high ratio of surface-to-volume of reactive material that exposes a...
4011067 Filter medium layered between supporting layers  
A new filter medium, which can remove a high percentage of fine particles from a gas stream while causing a relatively low pressure drop in the gas stream, comprises a base porous web, one or more...
3986851 Filter of polytetrafluoroethylene fibers  
A filter element for aerosols and finely divided solid particles suspended in a gas, is formed by depositing a septum of microscopic and submicroscopic unsintered fibers of fibrillatable...
3966434 Method for filtering gas and cleaning of filter bags  
A process for removing solids from a stream of gas comprising passing a solids-laden gas through a woven fabric filter bag, which bag is installed with longitudinal slack, wherein, during...
3962153 Very highly stretched polytetrafluoroethylene 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...
3960651 Reinforced air-pervious polytetrafluorothylene sheet  
An air-pervious sheet predominantly of polytetrafluoroethylene, the sheet being reinforced by being fused to a liquid-pervious reinforcing material layer which is capable of retaining its original...
3957938 Pretreatment of polytetrafluoroethylene filter bags  
Polytetrafluoroethylene bags used in solids filtering units are preshrunk to preclude tearing or ripping of the bags.
3955226 Process for heat fixation of dyestuffs using polyester material as filter for circulating air stream  
Process for the heat fixation of dyestuffs on textile flat articles using a steamer with directional air or vapor stream wherein the circulating air or vapor stream is purified from dyestuff...
3951293 Gas-permeable, liquid-tight closure  
A gas-permeable liquid closure for containers of liquids or solids which emit or absorb gas is provided by a film of an unsintered tetrafluoroethylene having a thickness of from about 0.1 to 3...
3949130 Spun bonded fabric, and articles made therefrom  
A spun bonded web of substantially continuous synthetic filaments has one side that is at least two times smoother than the other side. The majority of the filament cross points within the web are...
3946101 Filtering material  
A fluid filter, especially useful for cigarettes and the like, comprises cellulose which has been oxidized by an inorganic metal nitrate, such as manganese nitrate.Other constituents, such as...
3937860 Filtration material  
A high temperature resistant filtration material is produced having outer layers of a nonwoven fabric made of fibers of an aromatic polyamide having repeating units of the formula ##SPC1##A first...
3937621 Filter bag cuff  
A filter bag which, when installed, exhibits an improved seal between the thimble and the bag is provided by (1) encasing the ring member in fabric, (2) by incorporating a fabric sleeve concentric...
3933643 Electrically conducting filter media for fluids  
Conductive filter elements are made by treating nonconductive fibrous materials such as inorganic or organic fibers with resins containing finely divided carbon. The treated fibers are then...
3933561 Process for manufacturing ultrathin polymer membranes and products derived therefrom  
Unsupported ultrathin polymer film is made in bulk form by floating the film on a bath, transferring the floating film to a release substrate, drying the resulting film/substrate composite,...
3920428 Filter element  
A strong flexible filter element adapted to remove particulates from the exhaust gas of internal combustion engines comprising a non-woven mat of glass fibers fused with aromatic polyamide fibers,...
3904798 Varying density cartridge filters  
Polypropylene or other fiber-forming polymer is melt extruded as a continuous molten stream which is attenuated by a plurality of gaseous streams into a fine filament and projected onto a rotating...
3890125 Filter bag  
A filter bag of thermoplastic material for filtering solids from gases has a longitudinal joint formed by fusing together overlapping edge portions of the material so as to form a tubular body. In...
3877909 Internally self-supporting filter and process for making same  
An internally supported, composite frameless filter is disclosed and includes the following: 1. Two or more fluid permeable filter members having substantially the same peripheral shape; 2. A...
3856482 DEGASSING OF BRINE  
Brine coming to the earth's surface can contain substances other than salt in water; occasionally of particular interest is gas contained in the brine, especially natural gas or methane or ethane....
3850600 FILTER MEDIA  
Improved air filters of felt carrying electrically charged resinous particles comprise a felt made from a mixture of wool and acrylic fibers.
3841391 HEATING AND COOLING METHOD  
A method and apparatus for dividing a gas into two parts: a first part which is cooler and a second part which is warmer than the original gas. The apparatus includes a molecular filter for...
3830045 COMPACT AIR FILTER  
A compact fibrous glass air filter unit is provided having a rectangular frame holding an air filter; the frame having an edge flange portion having a top and a bottom half folded over the filter,...
3815341 FILTER FOR REMOVING SUCH PARTICLES AND MISCELLANEOUS DIRT AS CONTAINED IN A FLUID  
A filter consists of a base member, which is a coarsely woven or knitted fabric or reticulated material, with flocked fibers on the surface, the length of the fibers being between 1.5 and six...
3803810 LIQUID-GAS SEPARATOR AND FILTER  
A filter unit that will not gas block is provided, capable of separating gases and liquids and of filtering liquids, and especially of removing and venting gases contained in liquids to be...
3798104 GAS ACTIVATED BONDING OF UNDRAWN POLYAMIDE ARTICLES  
3793813 PLEATED FILTER ASSEMBLY  
A filter assembly comprising an outer housing having upstream and downstream openings to permit fluid flow therethrough, an inner housing having an upstream and downstream opening therein to...
3791105 METHOD AND APPARATUS FOR SEPARATING OIL FROM A MIXTURE OF OIL AND A GASEOUS FLUID  
The present disclosure is directed to an oil filter for removing oil from a gaseous fluid in which the oil containing gaseous fluid is passed through two filter stages, the first of which is a...
3787277 MONO-GRAIN LAYER MEMBRANE  
A membrane comprising a film of synthetic resin in which a piece of wire gauze is embedded. The apertures of the piece of wire gauze accommodate grains which protrude through the surface on one or...
3774375 POCKET TYPE FILTER  
An improved pocket type fluid filter, the pockets of the filter being fabricated from a fluid permeable batt-scrim laminate joined together by heat seals.
3763633 ELECTROSTATIC AIR FILTER  
An air cleaner is provided comprising a filter assembly, an electrical power pack, and interconnecting high-voltage transmission means. The filter assembly is constructed of a filter unit having a...
3746595 METHOD OF MAKING A SELF SUPPORTING FILTER WITH POSITIONING OF A TUBULAR SLEEVE IN A MOLD  
3744534 PROTECTIVE CLOTHING FABRIC  
A flame-resistant and toxic chemical-agent protective clothing fabric woven of aromatic polyamide yarns and carbon yarns having at least 12 mg of carbon yarn per square centimeter of fabric, said...
3718982 EXCESS LINT INDICATOR FOR A CLOTHES DRYER  
A domestic clothes dryer has a circulating airflow duct system including a tumbling drum and a lint filter for filtering lint from air leaving the tumbling drum. An excess lint indicating system...
3698984 METHOD OF SEALING FILTER CORES TO FRAME MEMBERS