Organic (e.g., Vegetable) Patents (Class 55/528)
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Patent number: 6758877Abstract: A filter and a method of manufacturing the filter which is formed by spinning a fiber in a semi-molten state onto a mold such that the mold is provided as a filter structural member. The method obviates the need to remove the filter from the mold and thus simplifies the manufacture of the filter.Type: GrantFiled: February 25, 2002Date of Patent: July 6, 2004Assignee: Toyoda Boshoku CorporationInventors: Kouichi Oda, Tomohide Nishino
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Patent number: 6758878Abstract: Self-supporting pleated fluid filter medium and method of making the same wherein the filter medium and accompanying flow-through border frame are of coated thermobondable materials, which are heat bonded together.Type: GrantFiled: April 10, 2002Date of Patent: July 6, 2004Assignee: AAF McQuay, Inc.Inventors: Kyung-Ju Choi, Dennis R. Porter, Paul B. Ryan
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Publication number: 20040123574Abstract: A filter material comprising a blend of at least three types of fibers: (a) polypropylene fibers (b) polymethaphenylene isophtalamide fibers and (c) fibers of a third type selected from the group of acrylic and modacrylic. In a preferred embodiment, the blend contains about ten weight percent polymethaphenylene isophtalamide fibers, about 50 weight percent polypropylene fibers and about 40 weight percent modacrylic fibers. Performance of the blend is superior to the prior art filtration materials, especially at the preferred compositions.Type: ApplicationFiled: December 31, 2002Publication date: July 1, 2004Inventors: Rodney R. Wilkins, K. Dale Montgomery, Stephen W. Alexander, James G. Tuttle, Edwin G. Hoel
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Patent number: 6752847Abstract: A filter medium for use in particulate filtering applications is disclosed. The filter medium is formed from a substrate capable of retaining the desired physical structure of the filter medium under the conditions of the filtering application, including temperature. A polyimide based stiffening agent adapted for treating the substrate is also provided.Type: GrantFiled: November 30, 2001Date of Patent: June 22, 2004Assignee: BHA Group Holdings, Inc.Inventor: Alan Smithies
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Publication number: 20040112023Abstract: A high efficiency fluid filter arrangement wherein a combined layer of scrim and filter media applications is of empirically relatively estimated weight size and depth with intermediate pleat spacing so as to arrive at a combined filtration capability value in keeping with selected approved test standards.Type: ApplicationFiled: December 12, 2002Publication date: June 17, 2004Inventor: Kyung-Ju Choi
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Publication number: 20040112019Abstract: A washable cloth vacuum cleaner filter bag for use on wet/dry vacuum cleaners and in central vacuum cleaner systems includes a first opening for receiving vacuumed debris, means for attaching the first opening to the inlet of the vacuum cleaner or system, and a second opening, which is reversably sealable, for removing the vacuumed debris from the bag. In combination with the bag, the vacuum cleaner or system may be successfully used to suction up fine particulate debris, including gypsum dust and MDF dust. For a preferred embodiment of the new vacuum cleaner filter bag, the bag, which is of generally rectangular shape, is fabricated from a tight weave, synthetic-fiber cloth having a warp of about 160 threads per inch and a weft of about 68 threads per inch. A variety of fastener types may be employed for the reversably sealable second opening. The second opening incorporates a cuff on one side of the opening which is turned inside out to fold over the edge of the other side of the bag.Type: ApplicationFiled: December 16, 2002Publication date: June 17, 2004Inventor: Robin A. Mountford
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Publication number: 20040112217Abstract: The use of a textile fabric which has at least one napped side for attachment in front of windows or doors to protect against dusty allergens such as pollen or house dust.Type: ApplicationFiled: February 9, 2004Publication date: June 17, 2004Inventor: Andreas Schroder
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Patent number: 6746517Abstract: The use of fine fiber or fiber having a fiber diameter of about 0.0001 to 0.5 microns has become an important design tool for filter media. Common filter media have been prepared with a layer of fine fiber on typically formed the upstream or intake side of the media structure. The fine fiber increases the efficiency of filtration by trapping small particles which increases the overall particulate filtration efficiency of the structure. Improved fine fiber structures have been developed in which a controlled amount of fine fiber is placed on both sides of the media to result in an improvement in filter efficiency but a substantial improvement in lifetime.Type: GrantFiled: May 31, 2001Date of Patent: June 8, 2004Assignee: Donaldson Company, Inc.Inventors: James D. Benson, Douglas G. Crofoot, Mark A. Gogins, Thomas M. Weik
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Patent number: 6743273Abstract: Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.Type: GrantFiled: May 31, 2001Date of Patent: June 1, 2004Assignee: Donaldson Company, Inc.Inventors: Hoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
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Patent number: 6740142Abstract: The filter structures commonly known as a bag house or a filter bag or an air filter with a bag construction can be made by preparing the bag assembly, either in a tubular or a bi-fold construction by placing a layer of fine fiber on the upstream surface of the filter media structure. The filter assembly includes a filter cabinet with an interior component. The filter component is suspended within the filter cabinet interior. The filter component includes a frame or support for the filter media. The frame or support holds the filter bags such that the filter bags are suspended from the frame in the cabinet interior. The intake air enters the cabinet, passes through the filter assembly and exits the cabinet. The air must pass first into the fine fiber layer, the filter media and then the exterior of the cabinet.Type: GrantFiled: May 31, 2001Date of Patent: May 25, 2004Assignee: Donaldson Company, Inc.Inventors: John M. Buettner, James A. Leblanc, Mark A. Gogins, Thomas M. Weik
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Patent number: 6736874Abstract: A filter device, especially for filtering the intake air of an internal combustion engine, which includes a housing with an unfiltered air inlet and a clean air outlet, and a substantially cylindrical, replaceable filter insert disposed in the housing, which separates an unfiltered air zone within the housing from a clean air zone. An axial seal is provided on at least one end disk of the cylindrical filter insert, which seal interacts with a sealing surface on the housing to seal the unfiltered air zone from the clean air zone. A clamping wedge is also provided, which exerts a force on the filter insert to urge the axial seal reliably against the sealing surface of the filter housing.Type: GrantFiled: November 27, 2002Date of Patent: May 18, 2004Assignee: Filterwerk Mann & Hummel GmbHInventors: Mario Rieger, Matthias Amann
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Publication number: 20040083695Abstract: The invention refers to a composite filter for filtering a stream of ambient air comprising at least one non-prebonded upstream tier and one non-prebonded downstream tier, wherein the ratio of absolute pore volume of upstream tier to downstream tier RAPV>2, and the absolute projected fiber coverage of upstream tier and of downstream tier APFC>95%.Type: ApplicationFiled: December 22, 2003Publication date: May 6, 2004Inventors: Jan Schultink, Bas Schultink
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Patent number: 6723147Abstract: An air-permeable filter for an ink cartridge includes at least one porous material layer including at least one resin selected from the group including fluororesin and polyolefin resin, and at least one air-permeable substrate layer having a tensile strength of 1 MPa or more. In addition, an ink cartridge includes a space for receiving an ink and at least one air vent in which the air-permeable filter is provided.Type: GrantFiled: April 4, 2001Date of Patent: April 20, 2004Assignee: Nitto Denko CorporationInventors: Hiroaki Mashiko, Hiroyuki Nishii
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Patent number: 6723157Abstract: A material is provided for capturing a chemical substance comprising fibers which carry metal alkoxide particles on the surfaces thereof. The metal alkoxide particles are made from an oligosilica, an oligozirconia, an oligotitiania, or the like. The fibers may include inorganic fibers, regenerated fibers and/or synthetic fibers. The material for capturing a chemical substance is produced by a method comprising steps of subjecting the fibers to a surface treatment for facilitating adhesion of the metal alkoxide particles to the surfaces of the fibers, forming the metal alkoxide particles on the surfaces of the fibers, and fixing the metal alkoxide particles to the surfaces of the fibers. A chemical substance-capturing tube, capable of capturing a trace of a chemical substance in a liquid or a gas, can be produced by placing the fibers, i.e., the material for capturing a chemical substance, in a hollow tube.Type: GrantFiled: June 4, 2003Date of Patent: April 20, 2004Assignees: Sun Plastics Co., Ltd.Inventors: Takao Tsuda, Motonori Munesue
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Publication number: 20040065066Abstract: A filter pack is formed of a pleated filter section and a top edge band and a bottom edge band that form a frame. The filter section and the frame are formed of a nonwoven polymer material, preferably a polyester material. The filter section is retained in the frame by an adhesive, preferably also a polyester material. The filter pack provides more filtration media per area, leading to more efficient filtration. The filter pack is fully shreddable and does not require separation into various components for recycling.Type: ApplicationFiled: July 17, 2003Publication date: April 8, 2004Inventors: Kent Mertz, Markus Schmitt, Beatrix Yvonne Schmitt
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Patent number: 6716266Abstract: A dust filter for a ducted air delivery system has a frame, a filter, an extension of rubbery thermoplastic material, and an integral lip. The frame defines an open mouth and a body portion formed of rubbery thermoplastics material reinforced with one or more stiffening elements. The filter material extends from sides of the frame to cover the open mouth. The intermediate extension of rubbery thermoplastic material extends outwardly from a joint with the body portion. The integral lip of flexible resilient material is joined to the intermediate extension. The lip of flexible resilient material is shaped to make a friction fit within the outlet of a duct to hold the dust filter therein.Type: GrantFiled: September 7, 2001Date of Patent: April 6, 2004Inventor: Craig Douglas McNaughton
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Air filter assembly for filtering an air stream to remove particulate matter entrained in the stream
Patent number: 6716274Abstract: Filter arrangements for industrial air cleaners include a barrier media, usually pleated, treated with a deposit of fine fiber. The media is particularly advantageous in high temperature (greater than 140° F.) operating environments.Type: GrantFiled: May 31, 2001Date of Patent: April 6, 2004Assignee: Donaldson Company, Inc.Inventors: Mark A. Gogins, Thomas M. Weik -
Patent number: 6706085Abstract: A filter assembly for filtering particulates out of a stream of gas, which includes an elongated filter bag made out of fabric with a plurality of pleats intermediate its ends with a support cage made from a plurality of wires on the outside of the bag having portions thereof disposed in the pleats.Type: GrantFiled: March 22, 2002Date of Patent: March 16, 2004Assignee: Albany International Corp.Inventors: Michael Gerakios, Paul Bowden, Ray Moeser
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Publication number: 20040035095Abstract: A filter media comprising a synthetic microfiber polymer fine fiber web wherein the diameter of the fibers is between about 0.8 to about 1.5 microns. The filter media is acceptable for use in ASHRAE applications. Constructions with a low DP backing, support or prefilter layers of coarse fiber provide large area filter webs of high efficiency and a stable and high threshold value of alpha above eleven.Type: ApplicationFiled: March 12, 2003Publication date: February 26, 2004Applicant: HOLLINGSWORTH & VOSE COMPANYInventor: David Thomas Healey
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Publication number: 20040035096Abstract: An air filter comprising an elastomeric flange member and a filter member mounted therein. The flange member has opposing ends and sides that define a central opening and protruding members integrally formed with the flange member and extending therefrom. The protruding members have opposed inwardly facing faces. The filter member has filter ends and sides and the filter sides are attached to the opposed faces in an insert molding process or via bonding of the filter sides to the respective faces.Type: ApplicationFiled: April 18, 2003Publication date: February 26, 2004Applicant: Romanow Enterprises, Inc.Inventor: Sangsun Ham
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Publication number: 20040016345Abstract: A filter element that comprises a porous molded web 10′ that contains thermally bonded staple fibers 12 and non-thermally bonded electrically charged microfibers 14. The molded web is retained in its molded configuration, at least in part, by bonds between the staple fibers 12 at points of fiber intersection 13. The web may be molded, for example, into the shape of filtering face mask 16.Type: ApplicationFiled: July 25, 2002Publication date: January 29, 2004Applicant: 3M Innovative Properties CompanyInventors: James E. Springett, Seyed Abolhassan Angadjivand
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Patent number: 6673136Abstract: Filter arrangements include a barrier media in the form of fluted media treated with a deposit of fine fibers. The media is particularly advantageous in high temperature (greater than 140 to 240° F.) systems. Such systems may include engine systems, gas turbine systems, and fuel cell systems. Filter arrangements may take the form of media packs having a circular cross-section or a racetrack shaped cross-section, or media packs formed in a panel configuration.Type: GrantFiled: May 31, 2001Date of Patent: January 6, 2004Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Mark A. Gogins, Thomas M. Weik
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Patent number: 6663684Abstract: Provided are a dust-collecting filter cloth that comprises a base fabric and web, wherein at least the web includes modified cross-section fibers of polyphenylene sulfide; and a bag filter made of the filter cloth. When fitted to an exhaust gas dust collector, the bag filter involves little pressure loss and ensures increased dust-collecting efficiency. As being resistant to heat and ensuring good dust-collecting efficiency, the filter cloth is useful for dust collection.Type: GrantFiled: February 1, 2001Date of Patent: December 16, 2003Assignee: Toray Industries, Inc.Inventors: Makoto Nakahara, Koji Kawakami, Takehiko Miyoshi
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Publication number: 20030208998Abstract: A filter bag is provided having a body comprising a filter media of stiffened nonwoven fabric. A method of manufacturing a filter bag comprising a filter media of stiffened nonwoven fabric is also provided.Type: ApplicationFiled: May 10, 2002Publication date: November 13, 2003Applicant: U.F. STRAINRITE CORPORATIONInventor: Alan Fowler Lapoint
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Publication number: 20030192294Abstract: A filter medium includes at least one first fiber made from a first polymer selected for the chemical and high temperature stability properties needed for a particular operation and at least one second fiber made from a second polymer having a relatively higher glass transition temperature than the first polymer. The filter medium has a higher glass transition temperature than the first fiber, allowing the filtering media to withstand the temperature requirements of the operation, while retaining the chemical resistance of the first fiber. This is particularly useful for pleated filters that are highly temperature dependent, and in industrial baghouse operations where temperatures often exceed the operating range of the first polymers. A method for making the filter medium is also disclosed.Type: ApplicationFiled: April 16, 2002Publication date: October 16, 2003Inventor: Alan Smithies
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Publication number: 20030177909Abstract: The present invention is directed to an air filter medium comprising nanofibers, the filter medium having a thickness of less than 0.25 millimeters, a Figure of Merit of greater than about 0.075, and an efficiency of greater than about 99.9% when capturing aerosol particles of about 0.18 microns in size and a pressure drop of less than about 40 millimeters water column at a flow rate of about 32 liters/minute through a sample 100 cm2 in size. A coating of the nanofibers may also be used to enhance performance of existing filter media by increasing the FOM of the existing filter media. Preferably, the nanofibers are fibrillated.Type: ApplicationFiled: January 13, 2003Publication date: September 25, 2003Inventor: Evan E. Koslow
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Patent number: 6623548Abstract: An electrostatically charged filter material including a blend of polypropylene fibres and one selected from the group consisting of: halogen free acrylic fibres; polyvinyl chloride fibers or a mixture of halogen free acrylic fibres and polyvinyl chloride fibres.Type: GrantFiled: September 15, 2000Date of Patent: September 23, 2003Assignee: Hollingsworth & Vose Air Filtration LimitedInventors: John Gordon, Jeremy Andrew Collingwood, Martyn Peter Kennaugh
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Publication number: 20030172631Abstract: The invention relates to a filter bag (11) for holding filtering material located inside a gas-insulated housing of an electrical installation. Said filter bag is produced from a fabric that is resistant to high temperatures, which eliminates the need for holding devices protecting the filter bag from hot switching gases to be provided inside the compressed gas housing.Type: ApplicationFiled: September 17, 2002Publication date: September 18, 2003Inventor: Andreas Marth
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Publication number: 20030145568Abstract: A filtered air vent has a housing with an inlet and outlet, at least one set of spaced apart airflow control elements extending across the housing elements, spaces between the elements, and a pleated filter disposed within the housing. The filter has alternating first and second pleats that open up in opposite first and second directions, respectively. In one exemplary embodiment of the invention, at least a portion of the pleats that open in a first one of the directions are disposed across the spaces between the elements. The filter may be made from a washable filter material such as, for example, woven polypropylene. The elements in one embodiment of the invention are rotatable blades of a damper disposed within the housing and each of the blades are disposed within a corresponding one of the pleats that open in the second direction.Type: ApplicationFiled: February 6, 2002Publication date: August 7, 2003Inventor: Joseph Hodge
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Patent number: 6602311Abstract: A fiber spinning device and process for manufacturing a web of fibers including a homogeneous mixture of fibers of different characteristics. Monocomponent fibers of different polymers can be extruded side-by-side from the same die system. Sheath/core bicomponent fibers can be alternated with monocomponent fibers formed of the same core polymer as used in the bicomponent fibers. Bicomponent fibers having a common core polymer and different sheath polymers can be extruded from alternate spinneret orifices in the same die plate. Multiple distribution plates are provided with surface grooves or depressions to direct polymer materials from independent sources to only selected spinneret openings in an array of spinneret openings while maintaining the polymers segregated from each other.Type: GrantFiled: February 25, 2002Date of Patent: August 5, 2003Inventor: Richard M. Berger
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Patent number: 6602328Abstract: A gas turbine suction air filter is provided wherein, despite a large capacity, dust is easily removed by an ultrasonic washer. A gas turbine suction air filter (1) has a box-like frame member (3) and a filter cloth (5) contained in the frame member (3). The frame member (3) is made of a metal material, preferably a stainless steel. The filter cloth (5) is formed having many pleats so that many folded faces (7) are formed. No intervening member is provided between adjacent folded faces (7, 7), with only a space being arranged there. The filter cloth (5) is a non-woven fabric of a synthetic resin fiber, preferably a polypropylene fiber. While this filter (1) has a large capacity, an ultrasonic wave reaches the entire filter cloth (5) when the filter (1) is washed by an ultrasonic washer.Type: GrantFiled: April 20, 2001Date of Patent: August 5, 2003Assignees: Mitsubishi Heavy Industries, Ltd., Kawasaki Prime Mover Engineering Co., Ltd.Inventors: Yoshiyuki Doi, Toyosei Aota, Katsutoshi Okuno, Shigeru Maehata, Kenji Isohasi, Tatsuo Adachi, Satosi Hara
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Patent number: 6602330Abstract: An air purification assembly (10) that is adapted to be used in combination with a vehicle incorporating a heating, ventilation and air conditioning (HVAC) system (100). The assembly (10) consists of three elements: an electrostatic stabilizing filter (12), a membrane filter (32) and an electronic ionizer (40). The three assemblies (12, 32, 40) when operating in combination with the HVAC system (100) substantially absorb unpleasant odors, smoke, dust, pollen, mold spores, pet dander and particulate matter produced by a vehicle exhaust emissions.Type: GrantFiled: December 6, 2001Date of Patent: August 5, 2003Inventor: Robert M. Allen
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Patent number: 6599342Abstract: A filter cartridge (16), especially for installation in an air filter of an internal combustion engine having a housing (10) with an inlet (12) for untreated air and an outlet (13) for clean air, the filter cartridge preferably being made of a pleated filter medium, and being provided with sealing elements on end plates (18, 19) arranged at the axial end faces of the filter cartridge. A support body (17) is provided on the inner wall of the filter cartridge with support surfaces (23) for axially and radially positioning the filter cartridge. A seal element (26) extending axially along the support body is also provided in the area of the support body.Type: GrantFiled: January 2, 2002Date of Patent: July 29, 2003Assignee: Filterwerk Mann & Hummel GmbHInventors: Heinz Andress, Helmut Luka, Bertram Uebelhoer, Gerhard Mayer, Werner Blossey
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Patent number: 6596049Abstract: A fiber spinning device and process for manufacturing a web of fibers in the nature of a homogeneous mixture of fibers of different characteristics. Monocomponent fibers of different polymers can be extruded side-by-side from the same die system. Sheath/core bicomponent fibers can be alternated with monocomponent fibers formed of the same core polymer as used in the bicomponent fibers. Bicomponent fibers having a common core polymer and different sheath polymers can be extruded from alternate spinneret orifices in the same die plate. Multiple distribution plates are provided with surface grooves or depressions to direct polymer materials from independent sources to only selected spinneret openings in an array of spinneret openings while maintaining the polymers segregated from each other.Type: GrantFiled: November 16, 1999Date of Patent: July 22, 2003Assignee: Filtrona Richmond, Inc.Inventor: Richard M. Berger
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Patent number: 6583072Abstract: A nonwoven fabric is formed of polyphenylene sulfide fibers impregnated with a synthetic resin by 5 to 50 wt % based on the total weight of the nonwoven fabric, and has stiffness based on the Gurley method specified in JIS L 1096 of 3000 to 10000 mgf, and can be used as a filter medium for collecting hot dust emitted from refuse incinerators, coal boilers, metal melting furnaces, and others.Type: GrantFiled: March 10, 2000Date of Patent: June 24, 2003Assignee: Toray Industries, Inc.Inventors: Koji Kawakami, Kiyoshi Aihara, Takehiko Miyoshi
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Publication number: 20030110745Abstract: A filter medium for use in particulate filtering applications is disclosed. The filter medium is formed from a substrate capable of retaining the desired physical structure of the filter medium under the conditions of the filtering application, including temperature. A polyimide based stiffening agent adapted for treating the substrate is also provided.Type: ApplicationFiled: November 30, 2001Publication date: June 19, 2003Inventor: Alan Smithies
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Patent number: 6572684Abstract: To provide chargeable tow and a laminate thereof, which can be produced with no restriction by the production or processing method, and without troubles such as twining on a roll or single thread snapping caused by static electricity generated in the production steps. Tow, in which the value (D/W) obtained by dividing the total fineness of tow (D) by the tow width (W) is 1,000 to 8,000 dtex/mm, is produced by making a fiber-processing agent adhere thereto, preferably using a particular amount of the agent, wherein the agent has a particular structure and contains a polyoxyethylene higher fatty acid ester and a sorbitan fatty acid ester in a particular blending ratio.Type: GrantFiled: December 27, 2001Date of Patent: June 3, 2003Assignees: Chisso Corporation, Chisso Polypro Fiber Company LimitedInventors: Masuo Iwata, Kanemitsu Fuchigami
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Patent number: 6562112Abstract: An electret is described that includes a surface modified polymeric article having surface fluorination produced by fluorinating the polymeric article.Type: GrantFiled: April 19, 2002Date of Patent: May 13, 2003Assignee: 3M Innovative Properties CompanyInventors: Marvin E. Jones, Christopher S. Lyons, David B. Redmond, Jeffrey L. Solomon, Seyed Abolhassan Angadjivand
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Publication number: 20030084788Abstract: The present invention provides an air filter made from a composite comprising a substrate and a polymeric foam. The air filter can comprise a single layer. The foam has a density gradient where the lower density upstream portion of the filter can trap larger particles, allowing smaller particles to penetrate into the filter and be trapped by the higher density downstream portion of the filter. The density gradient arises from intercalation of the polymeric foam with the substrate. The composite design provides comparable or improved filtration efficiencies compared to the complex prior art air filters which rely on multiple layers to provide a density gradient.Type: ApplicationFiled: June 21, 2002Publication date: May 8, 2003Inventor: Ladson L. Fraser
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Patent number: 6554881Abstract: A filter media having a synthetic microfiber polymer fine fiber web wherein the diameter of the fibers is between about 0.8 to about 1.5 microns. The filter media is acceptable for use in ASHRAE applications. Constructions with a low DP backing, support or prefilter layers of coarse fiber provide large area filter webs of high efficiency and a stale and high threshold value of alpha above eleven.Type: GrantFiled: October 27, 2000Date of Patent: April 29, 2003Assignee: Hollingsworth & Vose CompanyInventor: David Thomas Healey
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Patent number: 6547860Abstract: A process for the manufacture of a triboelectrically charged nonwoven, wherein a fiber blend made of polyacrylnitrile fibers with a titer of ≦1.7 dtex and of polyolefine fibers with a titer of ≦1.7 dtex is freed from lubricating agents and antistatic agents by washing, is dried down to a moisture content of <1% by weight and is carded on a longitudinal or randomizing card into a triboelectrically charged web with a mass per area unit of 15-80 g/m2. This web is taken off by two simultaneously running rolls and a transfer roll, so that the web is laid on to a conveyor in machine direction, and bonded directly inside a bonding set, the unbonded web being forwarded via 1 to 3 points of transfer only.Type: GrantFiled: November 21, 2001Date of Patent: April 15, 2003Assignee: Firma Carl FreudenbergInventors: Holger Buchwald, Karl-Heinz Morweiser, Klaus Veeser
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Publication number: 20030037675Abstract: Filter arrangements include a barrier media in the form of fluted media treated with a deposit of fine fibers. The media is particularly advantageous in high temperature (greater than 140 to 240° F.) systems. Such systems may include engine systems, gas turbine systems, and fuel cell systems. Filter arrangements may take the form of media packs having a circular cross-section or a racetrack shaped cross-section, or media packs formed in a panel configuration.Type: ApplicationFiled: May 31, 2001Publication date: February 27, 2003Inventors: Gary R. Gillingham, Mark A. Gogins, Thomas M. Weik
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Patent number: 6524360Abstract: An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides and mixtures thereof.Type: GrantFiled: February 14, 2001Date of Patent: February 25, 2003Assignee: Hollingsworth & Vose CompanyInventors: Stephen T. Cox, David T. Healey
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Patent number: 6517612Abstract: This invention is directed to a continuously cleanable, high performance filtration apparatus and a method for using the apparatus. The apparatus is a radial inflow centrifugal filtration device, which includes a filter element located within a chamber and rotatably coupled to a filtered fluid outlet in a bulkhead that abuts the chamber. The filter element is generally tubular, its side-walls encircling and, thus, defining an interior plenum. The filter element side-walls incorporate a filter media, preferably a laminated microporous membrane filter media. The filter element is rotatably coupled at the filtered fluid outlet by a seal which can maintain a seal as filter element rotates. Additionally, the device can include a boundary layer momentum transfer device made up of a plurality of stacked annular disks having central openings, each disk separated from adjacent disks by a desired gap. The central openings define a cavity in which the filter element is mounted.Type: GrantFiled: October 29, 2001Date of Patent: February 11, 2003Assignee: Gore Enterprise Holdings, Inc.Inventors: Steven Crouch, Steve Wright, Jeffrey Storm, Wai S. Poon, Stephen K. Stark, Daniel W. Thorpe, Glenn R. Voshell
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Patent number: 6514325Abstract: An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides and mixtures thereof.Type: GrantFiled: March 12, 2001Date of Patent: February 4, 2003Assignee: Hollingsworth & Vose CompanyInventors: Stephen T. Cox, David T. Healey
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Patent number: 6514324Abstract: A washable air filter for removing particles from the inlet air to a heating and/or air conditioning system formed of an assembly of a central polymeric pad containing actively charged charge control agents of a first polarity, a polymeric net containing a dispersion of charged charge control agents of a second polarity in the polymer on each side of the pad and a stiff, deformable metal or plastic grill on each side of the net to form an assembly which can be corrugated and placed in a perimeter frame. The charging is preferably accomplished as the assembly passes over the surface of a roller with a conductive surface.Type: GrantFiled: August 10, 2001Date of Patent: February 4, 2003Inventor: Rick L. Chapman
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Patent number: 6494936Abstract: A filter assembly comprises a housing (44) with an inlet (45) and an outlet (43). A filter module (10) is within the housing (44) and communicates with the inlet (45) and the outlet (43) such that fluid passing to the inlet (45) is filtered by the filter module (10) before passing to the outlet (43). The filter module (10) includes a filter membrane (11) of hollow cylindrical shape having an air throughput of at least 1300 normal cum/hr per 250 mm of the axial length of the membrane at an inlet pressure of 2 barg. Such a filter module (10) can be used in a process system (40) in which the module (10) supplies sterile air and is testable in situ.Type: GrantFiled: March 21, 2001Date of Patent: December 17, 2002Assignee: Pall CorporationInventor: George Brandwood Peacock
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Publication number: 20020144490Abstract: A fiber spinning device and process for manufacturing a web of fibers comprising a homogeneous mixture of fibers of different characteristics. Monocomponent fibers of different polymers can be extruded side-by-side from the same die system. Sheath/core bicomponent fibers can be alternated with monocomponent fibers formed of the same core polymer as used in the bicomponent fibers. Bicomponent fibers having a common core polymer and different sheath polymers can be extruded from alternate spinneret orifices in the same die plate. Multiple distribution plates are provided with surface grooves or depressions to direct polymer materials from independent sources to only selected spinneret openings in an array of spinneret openings while maintaining the polymers segregated from each other.Type: ApplicationFiled: February 25, 2002Publication date: October 10, 2002Applicant: Filtrona Richmond, Inc.Inventor: Richard M. Berger
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Publication number: 20020139099Abstract: A fiber spinning device and process for manufacturing a web of fibers comprising a homogeneous mixture of fibers of different characteristics. Monocomponent fibers of different polymers can be extruded side-by-side from the same die system. Sheath/core bicomponent fibers can be alternated with monocomponent fibers formed of the same core polymer as used in the bicomponent fibers. Bicomponent fibers having a common core polymer and different sheath polymers can be extruded from alternate spinneret orifices in the same die plate. Multiple distribution plates are provided with surface grooves or depressions to direct polymer materials from independent sources to only selected spinneret openings in an array of spinneret openings while maintaining the polymers segregated from each other.Type: ApplicationFiled: February 25, 2002Publication date: October 3, 2002Applicant: Filtrona Richmond, Inc.Inventor: Richard M. Berger
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Publication number: 20020134063Abstract: A fiber spinning device and process for manufacturing a web of fibers comprising a homogeneous mixture of fibers of different characteristics. Monocomponent fibers of different polymers can be extruded side-by-side from the same die system. Sheath/core bicomponent fibers can be alternated with monocomponent fibers formed of the same core polymer as used in the bicomponent fibers. Bicomponent fibers having a common core polymer and different sheath polymers can be extruded from alternate spinneret orifices in the same die plate. Multiple distribution plates are provided with surface grooves or depressions to direct polymer materials from independent sources to only selected spinneret openings in an array of spinneret openings while maintaining the polymers segregated from each other.Type: ApplicationFiled: February 25, 2002Publication date: September 26, 2002Applicant: Filtrona Richmond, Inc.Inventor: Richard M. Berger