Processes Of Making Filters Patents (Class 264/DIG48)
  • Patent number: 6165403
    Abstract: A method for manufacturing a filter cartridge that has a filter medium, which, on the circumferential side, is surrounded with clearance by a gasket-seal. The method provides for a frame to be arranged in the gap formed by the clearance, and sealingly bonded to the edges of the filter medium and the gasket-seal.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: December 26, 2000
    Assignee: Firma Carl Freudenberg
    Inventors: Udo Michaelis, Jorgen Knudsen
  • Patent number: 6123752
    Abstract: A high efficiency filtration medium comprised of a nonwoven filter web of electret charged fibers of a nonconductive thermoplastic resin having a resistivity greater than 10.sup.14 ohm-cm, preferably polypropylene. The nonwoven filter web has a basis weight (BW) of less than 60 grams/m.sup.2, an effective fiber diameter (EFD) of less than 5 microns and a penetration (PEN) of less than 0.03%, wherein the ratio);BW/(EFD.PEN)is greater than 200. The invention filter medium can be easily used in applications requiring HEPA performance at relatively low pressure drops.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: September 26, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Tien Wu, Richard Kinderman, Seyed Angadjivand
  • Patent number: 6083439
    Abstract: A polymer-bonded granular adsorptive, absorptive, chemisorptive, or catalytically active material and a process for producing molded bodies from this material. An objective was to develop a polymer-bonded granular adsorptive, absorptive, chemisorptive, or catalytically active material which is capable of forming an open-pore and sorptive foamed body at increased temperatures while not reducing the specific surface of the active material and with a binding effect only during the mixing and processing phases, as well as a process for producing molded bodies from this material. This objective was met by mixing and processing an adsorptive, absorptive, chemisorptive, or catalytically active fine-grained material together with a finely particulate, meltable polyethylene with the addition of a binding agent having an oligocondensate basis.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: July 4, 2000
    Assignee: Auergesellschaft GmbH
    Inventors: Rudolf Nastke, Gerald Rafler, Helmut Remde, Thomas Krugerke, Gabriele Stadermann, Jannett Kohls, Martin Kurth, Dieter Lubkoll
  • Patent number: 6068799
    Abstract: An electret article can be made by quenching a molten blend containing a polymer and a performance-enhancing additive. The resulting low crystallinity material can be annealed and charged to produce a material for making electret filters having superior oily mist loading performance properties.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: May 30, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Alan D. Rousseau, Marvin E. Jones, Betty Z. Mei
  • Patent number: 6062228
    Abstract: There is provided a biodegradable filter tow or filter material from renewable raw materials for the use as a tobacco smoke filter element of cigarettes, cigars or pipes as well as a method for preparing it, wherein fibers, films or foams prepared in an extrusion method from biopolymers based on thermoplastic starch or its polymer compositions are processed to the filter tow or filter material according to the present invention.The advantages of this invention reside in the use of mainly renewable raw materials, a fast and complete biodegradability of the natural biopolymer filter material, a pollutant-reducing flavor-increasing filtering effect and an economically favorable preparation method.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: May 16, 2000
    Assignee: Biotec Biologische Natuverpackungen GmbH & Co., KG
    Inventors: Juergen Loercks, Harald Schmidt
  • Patent number: 6056809
    Abstract: An air filter for use in residential and commercial heating and air conditioning systems including a laminated unit (100) having a filter media (102) where either side of the filter media (102) has a porous layer (104, 106) of passive electrostatic netting. The air filter has a corrugation configuration (142, 144) to increase the available surface area when compared to conventional flat filters.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: May 2, 2000
    Assignee: Rick L. Chapman
    Inventor: Rick L. Chapman
  • Patent number: 6048464
    Abstract: A leukocyte-removing filter material is described, which includes a porous element having fine pores of an average pore diameter of not less than 1.0 .mu.m but less than 100 .mu.m and a fiber structure composed of a plurality of fibers having an average fiber diameter of not less than 0.01 .mu.m but less than 1.0 .mu.m kept on the porous element. The porosity of the filter material is not less than 50% but less than 95%, and the proportion of the fiber structure to the filter material is not less than 0.01% by weight but less than 30% by weight. The ratio between the average pore diameter of the porous element and the average fiber diameter of the fiber structure is not less than 2 but less than 2,000 and the above fiber structure forms a reticulate structure. A process for producing the leukocyte-removing fiber material and an apparatus for removing leukocyte using the above fiber material are also described.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: April 11, 2000
    Assignee: Asahi Medical Co., Ltd.
    Inventors: Jun Tanaka, Tatsuya Fukuda, Kumi Yoshida
  • Patent number: 6048456
    Abstract: A method of manufacturing and remanufacturing a water treatment device having a media bed includes assembling a housing from a length of open pipe and a pair of end caps. One end cap is secured to each open end of the pipe. At lease two openings are formed at opposite ends of the housing. The housing is charged with media by passing the media through the openings in the housing. A pair of screens are provided in the housing outwardly of the media, and a pair of fittings are provided in the openings outwardly of the screens. The end caps may be permanently secured to the pipe, such as by an adhesive or other known techniques, prior to charging the housing with media. The water treatment device may be charged with media by forming a slurry, made up of the media and a liquid, and passing the slurry through the opening in the pipe. Liquid may then be drawn out of the housing through one of the fittings. At least one of the end caps may include a wall portion which overlaps a portion of the pipe.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: April 11, 2000
    Assignee: Palmer Technologies, Inc.
    Inventor: David G. Palmer
  • Patent number: 6042677
    Abstract: A filtration device is provided for withdrawing permeate essentially continuously from a multicomponent aqueous substrate containing growing microorganisms in a reservoir. A vertical skein of fiber is scrubbed with coarse bubbles which emanate from a conversion baffle positioned under the skein. The substrate is aerated with fine bubbles in a size range small enough to transfer oxygen to the substrate efficiently. The baffle traps the fine bubbles and converts them to coarse bubbles which are effective to scrub the fibers. In the most preferred embodiment, the finished headers of the skein are derived from composite headers comprising a fixing lamina of resin in which the fibers are potted near their terminal ends, and a fugitive lamina of fugitive powdery material in which the terminal ends of the fibers are potted. The fugitive lamina is removed, preferably by dissolving the powder, e.g. finely divided common salt in water.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: March 28, 2000
    Assignee: Zenon Environmental, Inc.
    Inventors: Mailvaganam Mahendran, Ake Adolf Deutschmann, Wayne Jerald Henshaw, Henry Behmann
  • Patent number: 6032807
    Abstract: A method correlates average fiber diameter with performance for a complex filtration media comprising a matrix of fibers having a fibrillated component with a diameter so small (e.g., less than 0.01 microns), that cannot be physically measured with accuracy. The method manufactures a selected matrix, derives the number average diameter of the fibers according to prescribed steps, some of which do not require actual physical measurements, and observes a performance characteristic. The method repeats the foregoing steps for different matrixes, yielding different number average diameters. The method expresses change in the selected performance characteristic as a function of change in number average diameter of the matrices.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: March 7, 2000
    Assignee: Baxter International Inc.
    Inventors: Shmuel Sternberg, Daniel R. Lynn
  • Patent number: 6004495
    Abstract: In a method of producing a filter body which comprises adsorber particles fixedly connected together by an adhesive and which is formed with through passages, a base member having through holes is used, through the through holes in which are passed needles which close off the through holes. The needles project into a housing chamber which is defined by the base member and into which the adsorber particles are then introduced. The needles project with end portions out of the adsorber particle bed. The adsorber particles are consolidated by the adhesive to constitute the filter body. Thereafter the needles are withdrawn from the consolidated filter body to give a filter body with corresponding through passages.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: December 21, 1999
    Assignee: Helsa-Werke Helmut Sandler GmbH & Co. KG
    Inventor: Thorsten Keibel
  • Patent number: 5993580
    Abstract: A filter element has a wavy filter portion including a plurality of ridges of a filter material, which are juxtaposed to one another and closed at their sides, and a flange portion extending along a mounting plane around the filter portion for supporting the filter portion. The flange portion is made of the same filter material extending from the filter portion, by compressing the filter material more densely than the filter portion. The filter element is manufactured by a step of preparing an intermediate product of a wavy sheet, and a step of forming the filter portion by leaving the central portion of the wavy intermediate product as in the wavy sheet, and forming the flange portion around the filter portion for supporting the filter portion, by pressing the side portions of the ridges of the wavy intermediate product along the mounting plane.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: November 30, 1999
    Assignee: Nippondenso Co., Ltd
    Inventors: Toshiaki Nakayama, Hideo Kamo, Yoshitaka Nishio, Tetsuro Okazono, Takanari Takagaki
  • Patent number: 5989420
    Abstract: A ceramic filter containing at least one functional material and method of manufacturing, a ceramic filter whose surface through which a liquid to be purified flows into is densest and the average particle size of the filter continuously increases toward the interior thereof, a method of manufacturing the ceramic filter including ultrasonic vibration, an extrusion molding die used to manufacture the ceramic filter and an extrusion molding apparatus using the die.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: November 23, 1999
    Assignees: Yuugengaisya Mikazuki Bunkakaikan, Yuugengaisya Mama Green Golf
    Inventor: Akitoshi Sugimoto
  • Patent number: 5979030
    Abstract: A composite filter media (100 includes a meltblown/spunbond composite fiber material and a mixed fiber triboelectric material are preferably attached to each other by needling the mixed fiber material with the meltblown/spunbond composite fiber material. A netting (104) is then attached by preferably needling the mixed fiber triboelectric material and meltblown through the netting (104).
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: November 9, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Pierre Legare
  • Patent number: 5976371
    Abstract: The present invention discloses two-part isocyanate-based adhesive compositions, free of inorganic pigments and fillers, which cure to form polyurethane-based adhesives having an opaque-white appearance greater than about L* 80 and a shore A hardness greater than about 50. Such materials are particularly useful for the preparation of bonded filter. The invention further describes a method for the preparation of bonded filters using these compositions and the bonded filters thereof. Additionally, these compositions can also be used as two part general household adhesives and/or caulkings wherein the two liquid parts are metered together just prior to application using a dispensing apparatus including, but not limited to, glue guns having two containers (e.g., tubes); one tube, for example, containing polyol and diol components and the second containing polyisocyanate.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: November 2, 1999
    Assignee: H.B. Fuller Licensing & Financing, Inc.
    Inventors: Albert M. Giorgini, James A. Hagquist
  • Patent number: 5964926
    Abstract: Disclosed is an improved filter formed from a non-dielectric material which has been coated with a dielectric material and electret treated by, for example, DC corona discharge treatment. Also disclosed is a method for the formation of the filter.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: October 12, 1999
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventor: Bernard Cohen
  • Patent number: 5961918
    Abstract: Honeycomb filters for the filtration of molten metal streams comprise a triangular cell cross-section in combination with specified cell density, cell wall thickness, filter open frontal area and geometric surface area, thereby offering improved filtration performance when compared with similar filters of square or circular cell design.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: October 5, 1999
    Assignee: Corning Incorporated
    Inventor: J. Paul Day
  • Patent number: 5951744
    Abstract: A unique filtration device (10) which continuously removes gas phase contaminants from an air stream through the use of partially hollow wicking fibers (20) impregnated with a fine solid carbon powder (18) or zeolites and formed into a fiber filter (12) with a selected chemisorptive liquid applied to one side of the fiber filter (12) and large carbon particles (19) applied to the other side of the fiber filter (12). The air stream to be cleaned is directed through filter element (12) which can capture the gas phase contaminants. The wicking fibers (20) include internal longitudinal cavities (22) filled with the fine carbon powder (18) and each having a relatively small longitudinal extending opening (24).
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: September 14, 1999
    Assignee: AlliedSignal Inc.
    Inventors: Ronald P. Rohrbach, Gordon W. Jones, Peter D. Unger, Daniel E. Bause, Lixin Xue, Russell A. Dondero
  • Patent number: 5935303
    Abstract: An electrostatic filter includes a fibrous component including a mixture of wool and synthetic fibers and a resinous component including a perfluoroalkyl acrylate copolymer resin and a p-tert-butylphenol formaldehyde resin, which resinous component is adhering to the fibrous component, both of the fibrous substrate component and the resinous component being in electrostatically charged conditions.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: August 10, 1999
    Assignee: Koken Ltd.
    Inventor: Kazushi Kimura
  • Patent number: 5902384
    Abstract: A unique filtration device (10) which continuously removes gas phase contaminants from an air stream through the use of partially hollow wicking fibers (20) impregnated with a fine solid powder and a selected chemisorptive liquid (18) which can capture the gas phase contaminants. The wicking fibers (20) are generally disposed to extend in the same direction and are formed into a filter element (12). The air stream to be cleaned is directed through filter element (12). The wicking fibers (20) include internal longitudinal cavities (22) filled with a fine powder and each having a relatively small longitudinal extending opening (24). The wicking fibers (20) are filled with the selected contaminant removing chemisorptive liquid through capillary action by which the individual wicking fibers (20) rapidly draw the selected chemisorptive liquid, with which they come into contact, through the internal cavities (22).
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: May 11, 1999
    Assignee: AlliedSignal Inc.
    Inventors: Ronald Rohrbach, Lixin Xue, Daniel Bause, Peter Unger, Russell Dondero, Gordon Jones
  • Patent number: 5891337
    Abstract: A filter of the type used to filter gases or liquids has molded plastic end caps on each end of the filter element with the ends of the filter element molded into the end caps. To prevent the end of the filter element from being exposed through the exterior surface of one of the end caps, a spacer is located between the end of the filter element and the exterior surface of the end cap. The spacer allows the plastic material of the end cap to permeate the spacer to form a thin layer of plastic on the end of the filter element. This prevents thin spots in the end cap which could result in leakage through the end cap.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: April 6, 1999
    Assignee: Air-Maze Corporation
    Inventors: Dennis B. Keller, Donald R. Denton
  • Patent number: 5885499
    Abstract: A filter well of plastic having a bottom portion with an outlet and supporting a filter provided on top of the outlet, which filter is well sealed against leakage of liquid, is produced by first forming a bottom portion having a supporting surface for the filter and an outlet opening. Thereafter, a filter is applied on the bottom portion so that it covers at least essentially the whole bottom portion. Then, the cylindrical wall portion of the filter well is formed against the bottom portion with the lower part of the wall portion surrounding the edge of the filter and the upper edge of the bottom portion so that the bottom and wall portions form a fused unit with the outer edge of the filter being fused into the filter well material.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: March 23, 1999
    Assignee: Pharmacia Biotech AB
    Inventor: Arvi Aksberg
  • Patent number: 5868933
    Abstract: An antimicrobial filter cartridge having a perforated core member wrapped with a first microporous membrane, which is in turn overwrapped with second and third microporous membranes. The membranes are covered with a criss-cross wrapping of antimicrobial treated yarn. The filter cartridge is sized so as to fit tightly into a cartridge housing of a fluid filtration system. Fluid passing through the cartridge housing will be filtered by the filter cartridge to remove microorganisms from the water and which prevents the growth of bacterial and other microorganisms on the filter media.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: February 9, 1999
    Inventors: Gilbert Patrick, Arvind S. Patil
  • Patent number: 5846276
    Abstract: An exhaust gas filter for passing exhaust gas of a diesel engine or the like therethrough, thereby removing particulate matter from the exhaust gas. By suitably controlling physical properties of the exhaust gas filter such as a thermal expansion coefficient, the durability of the exhaust gas filter can be enhanced. When a constituent material for the exhaust gas filter includes aluminum titanate as a primary component, the durability can be further enhanced.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: December 8, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Nobuaki Nagai, Shinji Wada, Yuichi Murano, Sachinori Ikeda, Kouichi Watanabe, Satoshi Matsueda, Makoto Ogawa
  • Patent number: 5830810
    Abstract: A plasma sterilizable fabric which is subjected to charging, for example electrostatic charging, is provided. Plasma sterilizable fabrics may include nonwovens and laminate nonwovens. The plasma sterilizable fabrics may also be treated with an antistatic material before or after subjecting the same to charging.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: November 3, 1998
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventor: Bernard Cohen
  • Patent number: 5817263
    Abstract: An integrated filter and sleeve assembly has an annular non-porous sleeve having opposing open ends and an outer circumferential wall with an inner surface. The integrated filter and sleeve assembly also has a filtration block disposed within the annular sleeve between the open ends. The filtration block includes a mixture of filtration media and a binder. A seal is formed between the inner surface and the filtration block by applying heat to the annular non-porous sleeve and the filtration block.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: October 6, 1998
    Assignee: Amway Corporation
    Inventor: Roy M. Taylor
  • Patent number: 5800769
    Abstract: There is provided a method for forming a nonwoven electret fiber filter with a nonwoven web of electret fibers needle-punched to an open scrim support. The scrim support material has individual discrete open areas with an average cross-sectional area as viewed from the plane of the filter media of at least 0.25 mm.sup.2, preferably 1.0 mm.sup.2, and a pressure drop across the scrim support, without the filter web, of less than 1.5 mm H.sub.2 O measured at 98.4 meters/min gaseous face velocity. The resulting filter has enhanced lifetimes, a low pressure drop and high filtration efficiencies.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: September 1, 1998
    Inventor: Thomas E. Haskett
  • Patent number: 5792354
    Abstract: In a filter well having an inlet portion and an outlet portion and a filter arranged between these, the filter is carried by a support surface having a number of flow channels, extending radially towards an outlet. The ridges between the flow channels have a width of not more than about 0.2 mm whereby essentially the entire upper surface of the filter becomes active at filtration. The filter well is formed by forming of plastic in a forming device, whereby the flow channel pattern in the support surface for the filter is formed by a forming part in the forming device, wherein a negative corresponding to the flow channel pattern has been made in the surface of the forming part by a photolithographic etching process or by laser machining.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: August 11, 1998
    Assignee: Pharmacia Biotech AB
    Inventor: Arvi Aksberg
  • Patent number: 5776343
    Abstract: An apertured film extruded from a crystalline, thermoplastic, extrudable fluoroplastic material. The film includes spaced-apart strand segments defining apertures therebetween and has at least 10 strand segments per inch. The film has a thickness of 2-12 mils and a Frazier air permeability number in the range of 200-2,000. The invention includes a process for preparing an apertured thermoplastic film by a single-sided embossing method. The process includes the steps of extruding in the machine direction, a film of a molten, crystalline, thermoplastic, extrudable, fluoroplastic material. The molten extruded film is passed in the machine direction through the nip of two metal rollers. One of the rollers has a substantially smooth surface, having a convex configuration as viewed from a direction substantially parallel to the axis of the roll, such that the diameter in the center of the roll is in the range of 8-12 mils greater than the diameter at the ends of the roller for a 40 inch roller.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: July 7, 1998
    Assignee: Applied Extrusion Technologies, Inc.
    Inventors: D. Timothy Cullen, Edward E. Hovis, Joseph V. Marra
  • Patent number: 5772831
    Abstract: A filter membrane element for a membrane separation unit for use in a water treatment apparatus or the like, and a method of manufacturing the same. An organic filter membrane including a plate-like support member made of nonwoven fabric and a film coating formed on both sides of the support member is joined with a surface of a filter plate, whereby the filter membrane element is formed. A portion of the film coating is dissolved to cause the support member to be exposed at that portion. Subsequently, the exposed portion of the support member is joined by adhesion or otherwise with a corresponding portion of the filter plate.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: June 30, 1998
    Assignee: Kubota Corporation
    Inventors: Masashi Moro, Kiyoshi Izumi
  • Patent number: 5766472
    Abstract: A method and apparatus for a filter assembly having a filter element with a plurality of openings encapsulated in a filter element carrier in a first molding operation, which may include formation of first and second channels on first and second side portions of the filter element carrier. One or more first holes are also formed through the filter element carrier in the first operation, wherein the first holes interconnect the first side portion of the filter element carrier and the second side portion of the filter element carrier so as to expose filter element portions encapsulated therebetween. A first sealing element is formed on the first side portion of the filter element and a second sealing element is formed on the second side portion of the filter element with a molten sealing element material in a second molding operation.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: June 16, 1998
    Assignee: Illinois Tool Works Inc.
    Inventor: Peter Tzakis
  • Patent number: 5759392
    Abstract: The fixing apparatus for fixing a fuel filter in the present invention comprises a ring portion for fixing fuel filter body securely by utilizing contraction force of resin. The fixing apparatus is made of resin softened by heat. The resin fixing apparatus has ring portion for accommodating and fixing a fuel filter. The inside shape of the ring portion is formed similar and somewhat smaller than the outer cylindrical shape of the fuel filter body. When the ring portion is heated and the resin and resin become flexible, the fuel filter is allowed to be press fitted into the ring portion.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: June 2, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kenji Okabe, Yoshihiko Ooya, Noriya Matsumoto, Kouji Izutani
  • Patent number: 5741421
    Abstract: A filter device with a preferably hollow-cylindrical, pleated filter element which is arranged concentrically around a cylinder axis and through which a medium to be filtered passes. Seals are necessary on the filter device so that the medium to be filtered will not be able to leak out and so that the filter element, which typically is constructed of filter paper, must be fixed in place together with its pleats. Advantageously, an elastic composition can be disposed as a seal on at least one of the ends of the filter element, and after curing the elastic composition will fix the pleats of the filter element and will have sufficient residual elasticity to seal the filter element with respect to a central mounting tube on which it is to be mounted.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: April 21, 1998
    Assignee: Filterwerk Mann & Hummel GmbH
    Inventors: Hans Erdmannsdoerfer, Helmut Storz, Manfred Wagner
  • Patent number: 5736041
    Abstract: A filter element for use in a filter holder having a sealing surface and method of making a filter. The filter being made of a folded material of manufacture having a circumferential sealing rim and having a spacer to keep open the folded areas. The spaced being formed by at least one cover layer folded with the filter. The sealing rim being formed to be received in the sealing surface and with the folds formed by at least one cover layer and the filter material both along and transverse to the folds around the circumference of the at least one cover layer and filter material being pressed into said sealing rim at a temperature above the softening temperature of at least a thermoplastic resin provided in at least one of the layers of the cover and filter material.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: April 7, 1998
    Assignee: Moldex-Metric, Inc
    Inventor: Martin Skov
  • Patent number: 5730918
    Abstract: Filter material in the form of activated charcoal compacts useful for selectively separating an organic phase from an inorganic phase, is prepared by a process comprising the following steps.A. Homogeneously blending activated charcoal particles having a particle size distribution of 1-100 .mu.m with psuedoboehmite-configured aluminum oxide in a weight ratio of 1:1 to 5:1;B. Adding distilled water to the homogeneous mixture while thoroughly mixing the same;C. Adding dilute acetic acid to the aqueous mixture while thoroughly mixing the same;D. Adding more distilled water to the mixture;E. Compacting the resulting mixture into tablets or similar objects in a mold under pressure, andF. Successively heating the resulting molded objects first at 80-100.degree. C. for 6 to 10 hours, then at 140.degree.-160.degree. C. for 8 to 10 hours, and finally at 180.degree.-200.degree. C. for 6 to 10 hours.
    Type: Grant
    Filed: August 5, 1996
    Date of Patent: March 24, 1998
    Assignee: MST Micro-Sensor-Technologie GmbH
    Inventors: Elena J. Nikolskaja, Natalia W. Maltzeva, Elena W. Loseva, Evgenia B. Koroljeva
  • Patent number: 5690823
    Abstract: A filtration medium made from a plurality of solid fibers aligned in the same direction and packed and bundle together and compressed at a portion thereof by a retainer member, and a displacement member disposed inside the packed fibers forming close packed aligned fibers defining a fluid flow passages between the fibers having a cross-sectional area capable of retaining particles from a fluid passing therethrough.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: November 25, 1997
    Inventors: John Reipur, Hans Olsen
  • Patent number: 5688460
    Abstract: A process for the manufacture of hermetically sealed filter units and a product made thereby. The process comprises aligning a porous filter element between two housing parts and a thermoplastic skirt that overlaps the edge of at least one housing part to shield the edge of the filter element disposed adjacent to the skirt, pressing the housing parts together and then injection molding a thermoplastic overmold band around the outer portions of the housing parts to form a hermetic seal at the edge of the filter element.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: November 18, 1997
    Assignee: Filtertek Inc.
    Inventor: Rick R. Ruschke
  • Patent number: 5667562
    Abstract: There is provided a vacuum cleaner filter medium which is a nonwoven spunbond web of conjugate spunbond fibers. The web has a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a Gurley Stiffness of at least 20 mg, and a pressure drop of 0.5 or less mm H.sub.2 O. The conjugate fibers are made from polymers, more particularly polyolefins, still more particularly polypropylene and polyethylene in a side-by-side configuration. The filter medium is treated by a hot-air knife and through-air bonded during the production process. The medium is also electret treated. The medium has sufficient stiffness to be converted into a filter by conventional techniques. While this invention is directed mainly to air purification and filtration, other gasses may be filtered as well.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: September 16, 1997
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventor: David Grant Midkiff
  • Patent number: 5662844
    Abstract: A filter for the filtration of a liquid, characterized by comprising a number of pores based on a number of microballoons formed in a hardened activation energy-setting resin layer, said pores being communicated with each other another so that said liquid can pass through said resin layer.The filter can be desirably formed in a desired form at a desired position at a high precision. The filter is suitable for use as a filter, especially in an ink jet head.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: September 2, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Goto, Toshiaki Sasaki
  • Patent number: 5660771
    Abstract: In order to prevent the formation of flash on a gasket used to seal a filter element when the filter element is mounted in a housing to filter a fluid, such as air for an internal combustion engine, a molding method and apparatus utilizes a pair of mold components which abut along a mold line and define a cavity for forming the gasket. As the expandable material expands to fill the cavity and form the gasket, a portion of the material adjacent the mold line is received in an annular groove in one of the mold components so that flash is not formed at the mold line. One of the mold components also has an upwardly sloping ramp surface so that air and gas move along the ramp surface as the material expands and does not become trapped in the cavity, thus avoiding defects and blemishes in the gasket due to trapped air bubbles.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: August 26, 1997
    Assignee: Dana Corporation
    Inventors: William F. Dunfee, Ronald Ray Puckett, Edward Allen Covington
  • Patent number: 5658517
    Abstract: A method of forming a filter for an inflatable vehicle occupant restraint inflator includes a tubular filter element having a generally cylindrical interior surface and a generally cylindrical outer surface having a predetermined diameter and a predetermined axial length and spaced radially outwardly from the inner surface. A tubular support member surrounds the outer surface. The support member is of an axial length equal to at least a major portion of the axial length of the outer surface and has an inner diameter substantially similar to the diameter of the outer surface for close surrounding engagement therewith. The support member has a plurality of through openings.
    Type: Grant
    Filed: September 11, 1996
    Date of Patent: August 19, 1997
    Assignee: Morton International, Inc.
    Inventors: Matthew A. Cox, Alan J. Ward, Michael P. Jordan
  • Patent number: 5656069
    Abstract: A filter material from active carbon compacts is prepared by the following steps:(a) mixing active carbon powder with polyvinyl alcohol powder in the ratio of 9:1 to 3:1,(b) mixing the powder from step (a) with distilled water or a mixture of distilled water and ethyl alcohol,(c) shaping tablets and similar articles in a mold under pressure, and(d) successively heating the tablets at1) 40.degree. to 80.degree. C. for 3 to 6 hours,2) 80.degree. to 120.degree. C. for 10 to 14 hours.A filter material according to the invention for the selective separation of organic material from an organic phase consists of active carbon compacts thus prepared and is used for the selective separation of organic and inorganic phases.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: August 12, 1997
    Assignee: MST Micro-Sensor Technologie GmbH
    Inventors: Elena J. Nikolskaja, Natalia W. Maltzeva, Elena W. Loseva, Evgenia B. Koroljeva
  • Patent number: 5656176
    Abstract: An apparatus and method of manufacturing a prepacked resin bonded well liner comprised of bonding granular particles to a perforated pipe. The granular particles are coated with a partially polymerized resin that is hard and tacky to the touch. Upon the introduction of heat, the polymerization proceeds, curing the resin into an insoluble and infusible cross-linked state. The contact regions between the adjacent particles bond the packed particles into a porous and permeable matrix.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: August 12, 1997
    Inventor: Gregory D. Scott
  • Patent number: 5645627
    Abstract: 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, oleophobic fluorochemical surfactants, and mixtures thereof.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: July 8, 1997
    Assignee: Hollingsworth & Vose Company
    Inventors: Norman Lifshutz, Richard E. Gahan, Graham C. Stevens
  • Patent number: 5645057
    Abstract: A nonwoven disposable face mask includes a filtration layer formed of a plurality of thermoplastic microfine meltblown microfibers having an average fiber diameter of less than 1.5 microns. The filtration layer also has a basis weight of less than ten grams per square meter. The resultant face mask provides improved wearer comfort and barrier and filtration properties.
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: July 8, 1997
    Assignee: Fiberweb North America, Inc.
    Inventors: James M. Watt, Deborah K. Lickfield
  • Patent number: 5643507
    Abstract: Filter media is provided. The filter media comprises a web of melt blown microfibers having one surface substantially flat and the other surface having periodic wrinkle-like undulations. A method of making the filter media is also provided. The filter media is useful in electret filters when charged.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: July 1, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Michael R. Berrigan, David A. Olson
  • Patent number: 5643345
    Abstract: A filter for an inflatable vehicle occupant restraint inflator includes a tubular filter element having a generally cylindrical interior surface and a generally cylindrical outer surface having a predetermined diameter and a predetermined axial length and spaced radially outwardly from the inner surface. A tubular support member surrounds the outer surface. The support member is of an axial length equal to at least a major portion of the axial length of the outer surface and has an inner diameter substantially similar to the diameter of the outer surface for close surrounding engagement therewith. The support member has a plurality of through openings.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: July 1, 1997
    Assignee: Morton International, Inc.
    Inventors: Matthew A. Cox, Alan J. Ward, Michael P. Jordan
  • Patent number: 5639368
    Abstract: A channelized mass transfer membrane (MTM) is disclosed which has improved ion separation characteristics when employed in electrodialysis cells. The MTM exploits the unexpected ion separation ability of channelized membrane geometries. A major improvement of the disclosed invention is the use of tubular channels formed by means of hollow fibers which limit the directions in which ions can diffuse. The chief embodiments of the MTM exploit either the formation of capillary voids in solid material or the use of hollow fibers to form capillary channels. Additional levels of MTM porosity are achieved by filling of the channels with microporous material. Means are disclosed for cooling the MTM and adaptation of the MTM hydraulic resistance.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: June 17, 1997
    Inventors: Dennis W. Davis, John L. Bill
  • Patent number: 5620641
    Abstract: Sheath-core bicomponent fibers comprising a core of a low-cost, high strength, thermoplastic material, preferably polypropylene or polybutylene terephthalate, completely covered with a sheath formed of polyethylene terephthalate or a copolymer thereof are produced, preferably melt blown to an average diameter of 12 microns or less, and formed into a self-sustaining, three-dimensional, porous element having various applications, principally as an ink reservoir element for a marking or writing instrument, although the porous element may also find utility as a tobacco smoke filter. Other forms of the product have utility in diverse applications where its excellent capillary, absorption and filtering properties are advantageous. The resultant products retain or improve upon the desirable features and processing capabilities of conventional elements, but are substantially less expensive, requiring less high cost polyester for equivalent or better properties.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: April 15, 1997
    Assignee: American Filtrona Corporation
    Inventor: Richard M. Berger
  • Patent number: 5620785
    Abstract: A nonwoven disposable face mask includes a filtration layer formed of a plurality of thermoplastic microfine meltblown microfibers having an average fiber diameter of less than 1.5 microns. The filtration layer also has a basis weight of less than ten grams per square meter. The resultant face mask provides improved wearer comfort and barrier and filtration properties.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 15, 1997
    Assignee: Fiberweb North America, Inc.
    Inventors: James M. Watt, Deborah K. Lickfield