For Series Flow Patents (Class 210/489)
  • Patent number: 5723047
    Abstract: A filter has a series of porous, compressible filter elements sealed at their outer edge by a collar of silicone rubber that is flowed into the filter elements. The collar seals with an annular recess around the inside of a filter housing so that flow through the housing is confined to the filter elements without any compression of them.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: March 3, 1998
    Assignee: Smiths Industries Public Limited Co.
    Inventor: Christopher Stratton Turnbull
  • Patent number: 5723044
    Abstract: A water filtration system for preventing a Zebra Mussel from entering a water system having a water intake line extending into an aquatic environment exposed to Zebra Mussels. The system contains an intake line connection for connecting the filtration system to the intake line; at least one water collection line extending from the intake line connection; a water intake line which is disposed sub-statantially parallel to the water collection line and which contains an orifice with a top surface and a copper screen recessed at least about 2.5 inches from the top surface; a first water filter and a second water filter, wherein each of these filters has a largest pore size that is small enough to prevent passage of an egg or veliger of Zebra Mussels; a a copper screen surrounding each of the first water filter and said second water filter; and a housing surrounding each of the water filters and including a first filter intake and a second filter intake.
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: March 3, 1998
    Assignee: Zebra Mussel Filter Systems, Inc.
    Inventors: Harry C. Gleason, Jeffrey L. Bond
  • Patent number: 5720881
    Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: February 24, 1998
    Assignee: Derrick Manufacturing Corporation
    Inventors: William W. Derrick, John J. Bakula
  • Patent number: 5716526
    Abstract: The invention provides a method of separating liposomes or lipid complexes from a fluidic medium. The method involves passage of a fluidic medium containing liposomes or lipid complexes through a composite filter which retains the liposomes or lipid complexes while allowing the fluidic medium to pass through. The filter is composed of a ceramic membrane and a ceramic substrate that is thicker than the ceramic membrane. Moreover, the average pore size of the ceramic membrane, from about 0.1 to about 0.2 microns, is less than the average pore size of the substrate.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: February 10, 1998
    Assignee: The Liposome Company, Inc.
    Inventors: Robyne J. Kelemen, Anthony G. Durning
  • Patent number: 5711877
    Abstract: A thin metal foil disc etched on both sides in such a way as to form a crossover pattern of rectangular flow passages (or channels) spiraling out, in opposite directions, from the inner diameter to the outer diameter of the disc. In the preferred embodiment, these channels have a depth slightly greater than half of the disc thickness, creating an opening through the thickness of the disc at their points of intersection. This disc design, when stacked appropriately into a filter element, provides substantially lower flow losses than other existing designs. When used as a filter, it performs as an absolute surface filter featuring a tortuous flow path and high degree of porosity. When used as a surface tension device, it offers superior wetting and re-wetting characteristics.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: January 27, 1998
    Assignee: Vacco Industries
    Inventor: Antonio E. Gonzalez
  • Patent number: 5707521
    Abstract: A filter element having a first tube 2 and a second tube 3, the outer circumferential surface of the first tube 2 being surrounded by a nonwoven layer 4, and the second tube 3 surrounding the first tube 2. On the outer periphery of the second tube 3 there is a yarn and/or paper winding 5, and a shrink tube 6 presses the yarn and/or paper winding 5 against the second tube.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: January 13, 1998
    Assignee: Filterwerk Mann & Hummel GmbH
    Inventors: Hans Erdmannsdoerfer, Bruno Sommer
  • Patent number: 5702607
    Abstract: An on-site automated closed loop petroleum based hydrocarbon fluid filtration and recycling system that continuously recycles a spent petroleum based hydrocarbon fluid and simultaneously continuously dispenses the recycled petroleum based hydrocarbon fluid.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: December 30, 1997
    Inventor: David M. Lawson
  • Patent number: 5702616
    Abstract: The present invention provides a polymeric, particularly aramid, fiber filtration sheet having a relatively small pore size and high pore uniformity. The present inventive aramid fiber filtration sheet preferably has a titer reduction against bacteria such as Pseudomonas diminuta. The present invention also provides a method of preparing reduced-diameter aramid fibers, as well as a method of preparing an aramid fiber filtration sheet from such reduced-diameter aramid fibers. The present invention further provides a method of treating a fluid by passing a fluid through the present inventive aramid fiber filtration sheet, as well as a filter element incorporating the present inventive aramid fiber filtration sheet.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: December 30, 1997
    Assignee: Pall Corporation
    Inventors: Peter J. Degen, Warren M. Foss
  • Patent number: 5690825
    Abstract: An expansible, compressed foam is used a s a filter medium and captured particulates are released from the foam by expanding the foam to open its pores. Micro-organisms such as Cryptosporidium or Giardia cysts may be trapped and recovered at high eficiency in a small volume of wash liquid easing further analysis. A foam filter element comprises thirty discs (36) of retriculated foam compressed between end plates (28,30) to about one tenth of their original thickness.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: November 25, 1997
    Assignee: Genera Technologies Limited
    Inventor: Adrian Parton
  • Patent number: 5679248
    Abstract: A coextruded block composite which includes a porous first block. The block is permeable to fluids and includes a granular component and a binder component. The block has interconnected pores therethrough having a first average diameter. The composite also includes a second block. In addition, at least one of the first block and the second block is continuous and at least a portion of the second block is contiguous with at least a portion of the first block. The second block also may be permeable to fluids. Additional blocks may be present, if desired. One or more of the blocks other than the first block may be a porous block having a granular component and a thermoplastic binder component. The coextruded block composite may be employed as a filter medium.
    Type: Grant
    Filed: December 19, 1995
    Date of Patent: October 21, 1997
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventor: Carol Ann Blaney
  • Patent number: 5679251
    Abstract: A diesel engine secondary oil filter is formed from a punched tinned steel spiral lock seam center tube, with a flanged cap at one end and a flanged threaded outlet at the other end. A layer of polyester non-woven media is wrapped in one wind around the center tube. A yarn is wound is a 27-diamond pattern in a first yarn section out to two inches outer diameter. The yarn is tied off. Knitted socks are first placed partially on axial ends of the first wound section, leaving half of the socks extending over the ends. A sheet of activated carbon paper about 1/6 of an inch thick and about 52 inches long is rolled onto the filter cartridge with about nine turns. The carbon paper is made of a cellulose paper impregnated with about 50% activated carbon powder by weight.
    Type: Grant
    Filed: July 24, 1995
    Date of Patent: October 21, 1997
    Assignee: The OilGuard Company, LLC
    Inventors: Kenneth E. Swanson, Charles W. Johnson
  • Patent number: 5676718
    Abstract: A computer drive bay cover with filter including a cover plate that has a front panel with a peripheral overhang. The front panel has a plurality of linear slots cut at a slant. The overhang has a pair of side portions with a pair of elongated projections for forming a rear channel. A filter sheet is positionable within the rear channel of the cover plate. Lastly, a rear panel is provided. The rear panel has an elongated rear edge that is hingedly coupled to the overhang. The rear panel has a bottom side with a plurality of pile-type fasteners that couple with a plurality of pile type fasteners affixed to a central processing unit housing. The rear panel is secured to the central processing unit housing for positioning of the cover plate, with the filter sheet, over a drive bay of the central processing unit housing.
    Type: Grant
    Filed: September 11, 1996
    Date of Patent: October 14, 1997
    Inventors: Lloyd S. Davison, Sharon M. Davison
  • Patent number: 5665233
    Abstract: Disclosed is a filter material for selectively removing leukocytes from a leukocyte-containing suspension, which comprises a porous element having an average pore diameter of 1 to 25 .mu.m and a total pore volume of 0.40 to 0.95 ml/ml of the porous element, and wherein the sum of respective pore volumes of pores of the porous element which have a pore diameter of 1 to 30 .mu.m is 90% or more, based on said total pore volume. Also disclosed is a filter apparatus for selectively removing leukocyte from a leukocyte-containing suspension which is packed with the above-mentioned filter material. By virtue of the filter material, the filter apparatus not only can remove leukocytes from a leukocyte-containing suspension at a leukocyte removal efficiency as excellent as 10.sup.-4 or less in terms of a leukocyte residual ratio without suffering from a pressure loss increase, but also can be rendered compact.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: September 9, 1997
    Assignee: Asahi Medical Co., Ltd.
    Inventors: Tatsuya Fukuda, Takao Nishimura, Naokuni Yamawaki
  • Patent number: 5665238
    Abstract: The present invention provides an apparatus for separating a relatively large volume of blood into cellular and acellular fractions without the need for centrifugation. The apparatus comprises a housing divided by a fibrous filter into a blood sample collection chamber having a volume of at least about 1 milliliter and a serum sample collection chamber. The fibrous filter has a pore size of less than about 3 microns, and is coated with a mixture of mannitol and plasma fraction protein (or an animal or vegetable equivalent thereof). The coating causes the cellular fraction to be trapped by the small pores, leaving the cellular fraction intact on the fibrous filter while the acellular fraction passes through the filter for collection in unaltered form from the serum sample collection chamber.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: September 9, 1997
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Peggy A. Whitson, Vaughan L. Clift
  • Patent number: 5656166
    Abstract: A substantially cylindrical, unitized filter element for separating contaminant material from a flowing media includes an outer, substantially cylindrical wall portion which is fabricated by a two step process involving both a compacting step followed by a sintering step. The result of these processing steps is to create a rigid, porous filtering matrix. The filter element also includes an inner, substantially cylindrical wall portion which is also constructed through a two step process of a granular material which has been compacted and sintered into a rigid and porous filtering matrix. Disposed between the two cylindrical wall portions is a substantially cylindrical structural support member which is fabricated from a non-restrictive material and a material which is compatible with the material selected for the inner and outer wall portions.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: August 12, 1997
    Assignee: Fleetguard, Inc.
    Inventors: Staffan B. Linnersten, Anatolie Hobet
  • Patent number: 5653869
    Abstract: Filtration chamber consisting of a cylindrical vessel having a bottom plate (1a) forming a support for the filtering system (11), this latter comprising a filter sheet (11a) and a filter netting bed (11b), both anchored to the bottom plate (1a). The filter sheet (11a) and the filter bed (11b) are fixed at their periphery onto an anchor ring (10), provided with a bayonet system (10a, 1c) for rapidly locking it onto the bottom support plate (1a). The filter sheet (11a), in the form of a punched plate or of a gate, and the filter bed (11b), in the form of a wire net, are fixed to the anchor ring (10), along its entire periphery, by welding. Three O-Ring type toroidal sealing gaskets (13, 15, 16) are positioned between opposed horizontal surfaces--of the bottom plate (1a), of the anchor ring (10), and of a rib (14) of the chamber wall (2)--so that the operation to for closing the bottom (1) of the chamber causes the simultaneous tightening of all the gaskets.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: August 5, 1997
    Assignee: 3V Cogeim S.p.A.
    Inventor: Ivano Evangelisti
  • Patent number: 5639370
    Abstract: A hollow, cylindrical, resin-bonded filter cartridge has an inner, depth-type filter media with a graded density which decreases (becomes porous) in the radial direction from the inner surface to the outer surface. An outer strip of filter media is then wound in a spiral or helix around the inner filter media. The outer filter media is also a depth type of filter media and has uniform density and is wound with adjacent windings abutting one another such that a continuous groove or channel is provided along the length of the cartridge. The groove or channel provides a greater effective surface area on the outer surface of the filter cartridge. The outer strip of filter media preferably comprises a lengthwise-extending body panel with a pair of leaves extending along either edge of the body panel. The leaves are folded against the lower surface of the outer filter media to provide a multi-layer outer filter media structure.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: June 17, 1997
    Assignee: Parker-Hannifin Corporation
    Inventors: Ronald E. Fall, Mehrdad Jafarabadi, John M. Ruddock
  • Patent number: 5637213
    Abstract: Filter apparatus for filtering contaminants from a fluid, such as machine tool coolant, are disclosed. One filter apparatus includes a filter drum unit having a generally cylindrical open perforated support sheet with a cylindrical screen element mounted thereabout. Circumference varying mechanisms, such as turnbuckles, are connected relative to the support plate to vary the circumference of the support plate and the tautness of the screen element. A disc filter assembly having a mandrel and fluidly attached annular disc filter elements is also described. Each annular disc filter element has an inner structure with concentric ribs forming concentric grooves therebetween which are connected to radially extending grooves. A screen element is supported by the ribs so that the microscreen will not tear while allowing filtering of fluid into the grooves which are in fluid communication with the mandrel.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: June 10, 1997
    Assignee: Henry Filters, Inc.
    Inventors: Stephen N. McEwen, Jay M. Creps, Scott M. McEwen, Richard A. Hallet, Robert F. Benschoter, Barry Benschoter
  • Patent number: 5632891
    Abstract: A septum adapted to be pre-coated with a filter and/or chemical treatment composition is formed of a tubular core member having a top and a bottom end. A plurality of top openings is provided in the core member immediately adjacent to the top end. A short actual length portion of the tubular core is impervious adjacent to the plurality of the top opening. The balance, extending for the major portion of the length of the tubular core is perforated. A multi-layer filter screen is positioned about the exterior of the tubular core. A tubular air release shield is positioned on the filter screen having a length to substantially extend from the tubular core top to cover the top openings in the tubular core and the tubular core impervious portion. A vent opening is provided in the air release shield. An end fitting closes the top end of the tubular core.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: May 27, 1997
    Assignee: Purolator Products Company
    Inventor: Stephen Krasicky, Jr.
  • Patent number: 5630940
    Abstract: The filter device (10), provided for the filtration of fluids, comprises two interconnected material structures (14,16) forming a filter unit (12). The two material structures (14,16) are mechanically stable, at least one of the two material structures (14,16) being elastically deformable. The two material structures (14,16) are connected to each other at opposite connecting sites, with one (16) of the material structures forming an arch between the connecting sites. This arch has been generated by elastic deformation of the respective material structure (16) so that this material structure (16) is mechanically biased. A stretching movement of this material structure (16) is prevented by the connection of this material structure (16) to the other material structure (14) which in turn is of substantially plane configuration and is tensioned.
    Type: Grant
    Filed: August 30, 1995
    Date of Patent: May 20, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Leonard M. Van Rossen, Bertus Dijkman
  • Patent number: 5628901
    Abstract: A single vessel with no moving parts is constructed to perform the functions of coalescing, vacuum dehydration, and thin film evaporation.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: May 13, 1997
    Assignee: Castrol Industrial North America Inc.
    Inventors: William L. Lawrence, Robert D. Coyle
  • Patent number: 5626752
    Abstract: A device for filtering and separating a flow medium by reverse osmosis, micro filtration, ultra filtration, or nano filtration has a pressure-tight housing having an inlet for the flow medium and a first outlet for the retentate and a second outlet for the permeate. A plurality of stacked units comprised of spaced apart membrane filter elements is provided, wherein the membrane filter elements are stacked atop one another to form a stack. The stacked units are sequentially arranged in the housing. The flow medium flows in sequence through the stacked units. Each one of the membrane filter elements includes areal outer membrane elements and an areal stabilizing element positioned between the areal outer membrane elements.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: May 6, 1997
    Assignee: DT Membranfilter Vertriebs GmbH
    Inventors: Jurgen Mohn, Wilhelm Heine, Robert Rautenbach, Rainer Mellis, Klaus Vossenkaul
  • Patent number: 5624560
    Abstract: A filter is provided which combines a woven wire mesh over a supporting body. The supporting body is typically a metal perforated tube which provides fluid communication between the well bore and the production equipment string. The woven wire mesh acts as a filter to prevent the influx of sand particles, provides openings oriented at various angles relative to its surface, so that some area is available for fluid entry even when particulate matter is lodged on the surface above an opening, provides interior channels that allow fluid to travel from one location on the mesh surface to another location over an opening into the supporting body, and does not provide "straight-through" openings, thus forcing the fluid to make multiple turns to pass through the mesh, thereby dissipating the fluid's energy and increases the mesh's erosion resistance. When particulate matter accumulates on the mesh's surface, the resulting particle cake remains porous, heightening the filter's resistance to plugging.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: April 29, 1997
    Assignee: Baker Hughes Incorporated
    Inventors: Benn A. Voll, Bennett M. Richard, Allen D. Gabrysch
  • Patent number: 5620599
    Abstract: A filter assembly for decreasing fluid hold-up waste and providing uniform flow while maintaining desired flow rates and pressures comprises a housing, a filter element including first and second end caps and a filter fastened therebetween, and a sleeve. The sleeve is positioned around the filter and may be joined to the first and second end caps, thereby forming the cage as a single integral unit which is positioned within the housing.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 15, 1997
    Assignee: PALL Corporation
    Inventors: Scott D. Hopkins, Timothy P. Pierce
  • Patent number: 5605625
    Abstract: A filter assembly includes a disposable filter element and a reusable perforated supporting core, the filter element being removably mounted around the perforated core. The filter assembly may include first and second end caps and each end cap may include a first segment or adapter attached to one end of the filter element and a second segment or adapter attached to a corresponding end of the core. The first and second segments or adapters of each end may be detachably sealed to each other. The filter assembly may include a wrap having one or more strips wrapped at least once around the filter element.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: February 25, 1997
    Assignee: Pall Corporation
    Inventor: Steven L. Mills
  • Patent number: 5601714
    Abstract: A disposable device for filtration and collection of blood during a surgical operation, which device comprises a housing with a cup-shaped portion, in which a wall section is forming a ledge in the reservoir inside the housing. A first self-supporting filtration element for venuous blood is upstanding from the ledge, and a second filtration element for cardiotomy blood is suspended from the cover, the two elements being arranged side by side in a parallel relationship. The filter elements have an elongate, oval cross-section.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: February 11, 1997
    Assignee: Polystan Holding A/S
    Inventor: Sverre M. Haveland
  • Patent number: 5593580
    Abstract: A filtration cassette, of a type comprising membrane filter sheets arranged in a peripherally bonded array of multilaminate character wherein the filter sheets alternate with foraminous (e.g., screen or mesh) sheet members, ribbed retentate sheet members, and a cross-flow filter comprising a multiplicity of stacked filtration cassettes of such type. The filtration cassettes and filter of the invention may be advantageously employed for dewatering of aqueous biomass suspensions, desalting of proteins, removal of secreted metabolites from cellular suspensions, and the like.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: January 14, 1997
    Inventor: Henry B. Kopf
  • Patent number: 5593581
    Abstract: An inorganic filtration unit includes a filter element made up of an inorganic rigid porous support having a face covered with at least one separating layer, and an element for circulating a liquid medium containing particles to be separated therefrom which forms, together with the face of the filter element, a sheet of the liquid, the sheet having a height of between 0.1 and 3 mm and preferably between 0.2 and 1.5 mm.
    Type: Grant
    Filed: August 7, 1995
    Date of Patent: January 14, 1997
    Assignee: Societe Anonyme: T.A.M.I. Industries
    Inventor: Philippe Lescoche
  • Patent number: 5591330
    Abstract: An oil filter utilizes a thermoplastic material having oil oxidation and acidification arresting additives mounted in a casing between a particle filtering material (such as cotton fibers) and a felt pad. The thermoplastic material is desirably high molecular polypropylene in the form of rice-shaped pellets, or spaghetti-shaped strands. The additives comprise about 10-17 weight % of the thermoplastic material/additive combination, and as the thermoplastic material is dissolved by above ambient temperature oil, the additives are released. The thermoplastic material pellets or strands are formed by mixing anti-oxidation and anti-acidification additives with liquid thermoplastic material to form a mixture, extruding the mixture into spaghetti like strands having a thickness of about 0.0625-0.125 inches, cooling the strands, cutting the strands into discrete elements, and then placing the discrete elements into an oil filter held in place to contact oil and to gradually dissolve to release the additives.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: January 7, 1997
    Assignee: T/F Purifiner, Inc.
    Inventor: Byron Lefebvre
  • Patent number: 5591337
    Abstract: A blood filtration device encapsulates a filter pad assembly Within a flexible housing. The filter pad assembly includes first and second filter media layers. A first heat and pressure sealed region integrally bonds the peripheries of the first and second media layers together. The flexible housing comprises a peripheral rim aligned with the first heat and pressure sealed region of the first media layer. A second heat and pressure sealed region, formed after the first heat and pressure sealed region, joins the rim of the flexible housing to the first heat and pressure sealed region, thereby forming a composite seal that encapsulates the filter pad assembly within the housing.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: January 7, 1997
    Assignee: Baxter International Inc.
    Inventors: Daniel R. Lynn, Billy W. Minshall, Allen R. Wons, David P. Fisher
  • Patent number: 5591335
    Abstract: Filtration medium is formed of a mass of nonwoven melt blown support and filtration fibers which are integrally co-located with one another. The support fibers have, on average, relatively larger diameters as compared to the filtration fibers which are integrally co-located therewith. Preferably, the filtration medium is disposed within at least one annular zone of a filtration element, for example, a disposable cylindrical filter cartridge having an axially elongate central hollow passageway which is surrounded by the filtration media. A depth filter cartridge in accordance with the present invention may thus be formed having one or more additional filtration zones (which additional filtration zones may or may not respectively be provided with integrally co-located support fibers) in annular relationship to one another.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: January 7, 1997
    Assignee: Memtec America Corporation
    Inventors: Steven D. Barboza, Charles Hoffman, Jr., Clinton V. Kopp, Robert J. Schmitt, Anthony C. Shucosky
  • Patent number: 5578207
    Abstract: The invention relates to a filter device for extruders and injection-molding machines, the screen elements being formed by a candle filter and, if required, by a plurality of candle filters, which are arranged in the circumferential direction on the screen plunger, extending parallel to the longitudinal axis of the screen plunger, and are flowed through from the outside inward for filtering purposes and from the inside outward for backwashing purposes.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: November 26, 1996
    Assignee: Firma Kreyenborg Verwaltungen und Beteiligungen KG
    Inventor: Jan U. Kreyenborg
  • Patent number: 5575910
    Abstract: There is disclosed a filtration unit for the selective separation of substances from fluids by membrane adsorbers, comprising a plurality of filtration chambers arranged in parallel and using membrane adsorber packs having a variable number of porous laminar sections, and wherein at each membrane adsorber pack, the same pressure drop is maintained between feed and permeate.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: November 19, 1996
    Assignee: Sartorius AG
    Inventors: Massoud Karbachsch, Peter Konstantin, G unter Pradel, Dieter Schmidt
  • Patent number: 5571413
    Abstract: A layered composite material for filtration having a filter layer, a buffer layer, and a support, layer. The buffer layer is a material more compressible and extensible than the support layer and imparts strength and durability to the composite material.
    Type: Grant
    Filed: June 18, 1993
    Date of Patent: November 5, 1996
    Assignee: Junkosha Company Ltd.
    Inventors: Yoshiaki Mogami, Akira Moriya
  • Patent number: 5566611
    Abstract: The invention relates to an apparatus for separating liquid from solids-liquid mixtures, in particular fibrous matter suspensions, more particularly under pressure, comprising a solid retention component having liquid passages, composed of a screen and a supporting body for the screen. The invention is primarily characterized in that the solids retention component is designed in multiple layers, that layer which faces the solids-liquid mixture taking the form of a screen (3) with apertures (7) and that layer which faces away from the solids-liquid mixture being designed as a support body (4) having slot-shaped apertures (5). The invention furthermore relates to an apparatus according to the present invention in the form of a worm press.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: October 22, 1996
    Assignee: Andritz- Patentverwaltungs-Gesellschaft m.b.H
    Inventors: Peter Scheucher, Gerhard Heindler, Walter Schinninger, Gerhard Paier, Peter Mraz
  • Patent number: 5567308
    Abstract: A point-of-use water filtration and dispensing unit including an unfiltered water storage container removably supported above a filtered water reservoir. The container has an inlet for unfiltered water and an outlet communicating with the reservoir, with the water in the container being exposed to atmospheric pressure. The filtered water reservoir communicates with a dispensing outlet having tap means which in its closed position resists the hydrostatic pressure of the water in the reservoir and the container. A seal removably seals the reservoir to the container, and a filter is removably located within the unfiltered water container such that water flows through said filter by gravity feed as filtered water is dispensed from the reservoir.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: October 22, 1996
    Assignee: Visshill-Tech (Patents) Pty. Limited
    Inventor: Timon J. Visser
  • Patent number: 5552046
    Abstract: A multiple stage filter having an extended useful life comprising a first stage having granulated activated carbon enclosed by multiple filter wafers, the filter wafer comprising a number of filter media having pore size ranging from 0.45 microns to 5 microns, and a second stage comprising a filter membrane having pore size of 0.2 microns or less and a surface area of several square feet, such that greater than 99 percent of particulates greater than 0.5 microns are removed in the first stage and greater than 99.9 percent of the bacteria and cysts are removed in the second stage.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: September 3, 1996
    Inventors: Arthur W. Johnston, Arthur F. Johnston
  • Patent number: 5552048
    Abstract: A filter includes a pleated filter element having longitudinally extending pleats and a wrap member wrapped around the filter element. The wrap member is joined to the peaks of the pleats and has openings for increasing the dirt capacity of the filter. The filter element may be a composite of a filter layer, upstream and downstream support and drainage layers, a cushioning layer between the upstream support and drainage layer and the filter layer, and polymeric beads on the downstream side of the downstream support and drainage layer. An extruded polymeric mesh may comprise one or both of the upstream and downstream support and drainage layers.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: September 3, 1996
    Assignee: Pall Corporation
    Inventors: John D. Miller, Kenneth M. Williamson, Joseph R. Swiezbin
  • Patent number: 5549826
    Abstract: A fluid filtration bag includes an outer porous fabric sleeve, and inner porous fabric liner, and a coherent filler material between the sleeve and liner. The filler material can act as the ancillary filtering media, while the sleeve and liner can act as containment mechanisms for the filler material. The liner has a pleated configuration, in which trough areas of the pleats are stitched to the fabric sleeve to form a series of tubes for containment and support of the filler material.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: August 27, 1996
    Inventor: John H. Lapoint, Jr.
  • Patent number: 5549825
    Abstract: A filter screen structure for a backflushed liquid filter has a screen separating the raw-liquid side of the filter from the clean-liquid side thereof, including at least one row of substantially parallel rods extending along the screen, wherein the screen is threaded between the rods, partially enveloping the rods alternatingly from the raw-liquid side of the filter and from the clean-liquid side thereof. At least some of the rods are provided with substantially circumferential groove-like recesses, facilitating the passage of the liquid from the raw-liquid side via the screen to the clean-liquid side.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: August 27, 1996
    Assignees: Filtration Ltd., Ytzhak Barzuza
    Inventor: Ytzhak Barzuza
  • Patent number: 5527452
    Abstract: A device providing for tribochemical regime in the lubrication system of a mechanism comprises a casing (1), a cover (2) with inlet openings (3) and an outlet sleeve (4) for the inlet and outlet of the oil, a non-return valve (5), a relief valve (6), a standard hollow full-flow filtering element (7), a tribochemical package consisting of coaxial perforated shells (8 and 9) enveloped in a filtering material (11), granulated alkaline reagent (12) placed between the shell (9) and the filtering element (7), as well as iodine with which is impregnated the filtering material (11) of the shell (8). The shells (8 and 9) consist of truncated cones with oppositely oriented bases. Their larger and smaller bases, respectively, are secured with tension on the casing of the relief valve (6), the larger base of the shell (9) is secured with tension on the outlet sleeve (4) and inside it is secured, at interference fit, a smaller base of the shell (8).
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: June 18, 1996
    Assignee: Metzhotraslevoe Nauchno-Proizvodstvennoe Obedinenie Ekologiya
    Inventors: Boris P. Grigoriev, deceased, Dmitry N. Glebovsky, Anatoly I. Belotserkovets, Mikhail E. Judovich, Elena A. Busko
  • Patent number: 5525222
    Abstract: Disclosed herein are improvements to a water filtration system on a water intake line that prevent the infestation of Zebra Mussels in the water system. The water filtration system filters any water entering the water intake line through a filter having a largest pore size that is small enough to prevent the passage of an eggs or veliger of Zebra Mussels. To prevent accumulation of Zebra Mussels on the filters and the filtration unit, copper screens surround the filters and the water intake to the filtration system. The filters are also provided with threaded ends to facilitate easy and reliable removal and replacement of the filters when needed.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: June 11, 1996
    Assignee: Zebra Mussel Filter Systems, Inc.
    Inventors: Harry Gleason, Jeffery Bond
  • Patent number: 5512175
    Abstract: An assembly for removing hydrophilic contaminants and a method of removing hydrophilic contaminants such as sodium included in an oil-state liquid using the removing assembly, which is able to remove positively the hydrophilic contaminants such as the sodium included in the oil-state liquid in each process of the plant such as a phenol producing apparatus as well as maintain a certain level of the removing performance for a long duration, consisting of: a coalescing element for coalescing and separating from the oil-state liquid the moisture including the hydrophilic contaminants such as sodium by being penetrated the fiber layer having the characteristics of alkali resistance and solvent resistance, typified by a carbon fiber; a liquid feeding means for feeding and supplying a mixed liquid of the moisture including the hydrophilic contaminants and the oil-state liquid; a water collecting means for collecting the moisture including the hydrophilic contaminants which is coalesced and separated; and a oil colle
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: April 30, 1996
    Assignee: Wako Industrial Co., Ltd.
    Inventors: Mikio Saito, Tsuneo Yamaguchi
  • Patent number: 5501804
    Abstract: In a mechanical cell for blending elastomer particles and solution into uniform mixtures, a solid core with an entrance surface, an exit surface spaced apart from and substantially parallel to the entrance surface, and a plurality of minute core passageways therebetween for flow of an elastomer-containing hydrocarbon solution from the entrance surface to the exit surface, the passageways have a characteristic dimension of predetermined size to reduce globules of elastomer to small particles distributed evenly in liquid hydrocarbon solution without plugging the passageways. Typically the passageways have a characteristic dimension of predetermined size to reduce globules of elastomer selected from the group consisting of natural rubber, styrene-butadiene rubber, polybutadiene rubber, polyisoprene, a nitrile rubber, and a copolymer of a 1,4-conjugated diene and a vinyl aromatic monomer, to small particles distributed evenly in liquid hydrocarbon solution comprising a vinyl aromatic monomer.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: March 26, 1996
    Assignee: Amoco Corporation
    Inventors: Richard A. Hall, Michael G. O'Connell, Evelyn A. Taylor
  • Patent number: 5501795
    Abstract: A high efficiency leucocyte-depletion filter for use with packed red cell concentrate derived from freshly drawn blood comprises a fibrous filter medium with a pore size of from about 0.5 to less than 3.6 .mu.m and a CWST of from 53 to about 80. The filter is preferably used in conjunction with a gel prefilter and, optionally, a microaggregate filter so as to minimize clogging. In a preferred embodiment, the voids volume is about 60% to about 85%.
    Type: Grant
    Filed: July 18, 1994
    Date of Patent: March 26, 1996
    Assignee: Pall Corporation
    Inventors: David B. Pall, Thomas C. Gsell
  • Patent number: 5498334
    Abstract: A filter for a synthetic resin melt has a housing formed from two blocks through which a melt channel for the passage of the plastics melt passes. A screen plate is rotatably mounted to intrude between the blocks and a plurality of recesses are distributed in a circular pattern around the periphery of the screen plate so that rotation can bring two of the recesses in to line with the channel. A plurality of filter elements are accommodated, one each in each recess, so that the plastic melt must pass through the filters in the recesses in line with the channel. To support the filter elements against melt pressure a stationary perforated plate is located in the channel immediately adjacent and downstream of the screen plate. By rotating the screen plate exhausted filter elements can be readily replaced. The filter elements are made of woven wire cloth and may be dished to prevent distortion of the mesh.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: March 12, 1996
    Assignee: Gneuss Kunststofftechnik GmbH
    Inventor: Detlef Gneuss
  • Patent number: 5482625
    Abstract: A filtration membrane module submerged with processed liquid in the processing tank. Plural plate-like, rigid membrane cartridges are vertically placed in parallel to each other as properly spaced from the adjoining membrane cartridges. The cleaning stream generating means for supplying a flow parallel to the membrane surfaces of the membrane cartridges opposes the gaps between the membrane cartridges opposite to each other. The sucking means for sucking the permeated liquid in each membrane cartridge is communicated with each passage of permeated liquid in each membrane cartridge. The membrane supporting plate for retaining the filtration membrane of the membrane cartridge is made hollow using a rigid structure member.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: January 9, 1996
    Assignee: Kubota Corporation
    Inventors: Kenji Shimizu, Hiroshi Ishida, Yutaka Yamada, Kiyoshi Izumi, Masashi Moro, Yuji Soeda
  • Patent number: 5476585
    Abstract: A filter assembly includes a disposable filter element and a reusable perforated supporting core, the filter element being removably mounted around the perforated core. The filter assembly may include first and second end caps and each end cap may include a first segment or adapter attached to one end of the filter element and a second segment or adapter attached to a corresponding end of the core. The first and second segments or adapters of each end may be detachably sealed to each other. The filter assembly may include a wrap having one or more strips wrapped at least once around the filter element.
    Type: Grant
    Filed: February 24, 1993
    Date of Patent: December 19, 1995
    Assignee: Pall Corporation
    Inventor: Steven L. Mills
  • Patent number: 5472606
    Abstract: A coreless filter comprises a pleated, spirally wound loop of material disposed in a housing. The loop includes a layer of filter material, such as a membrane filter, interposed between two support layers.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: December 5, 1995
    Assignee: Gelman Sciences Inc.
    Inventors: William C. Steere, Eric Sklar
  • Patent number: 5468382
    Abstract: A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibres which are free of fibre-to-fibre bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.
    Type: Grant
    Filed: December 30, 1993
    Date of Patent: November 21, 1995
    Assignee: Pall Corporation
    Inventors: Nigel J. D. Cook, Kenneth R. Weight, Richard G. Gutman, Roger A. Buttery, Michael Grimes