Patents Assigned to Cuno Incorporated
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Patent number: 6524411Abstract: A filter element comprising at least one elastomeric end-cap, a thin-walled pleated filter medium having edges thereon constructed and arranged for positioning proximate to the elastomeric end-caps, and a polymeric adhesive material within the end-caps for sealing the edges of the filter media therein, and a method for producing the same.Type: GrantFiled: January 31, 2001Date of Patent: February 25, 2003Assignee: CUNO IncorporatedInventors: John L. Pulek, Daniel Marcinczyk
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Patent number: 6513666Abstract: A three zone, reinforced, continuous, geometrically symmetrical microporous membrane including a porous support material encapsulated within a middle zone disposed between an upper zone and a lower zone wherein at least one of the three zones has a pore size at least about twenty (20%) percent different than the pore size of the other two zones is disclosed. Apparatus and methods for fabricating three zone reinforced, continuous, geometrically symmetrical, microporous membrane are also disclosed.Type: GrantFiled: January 17, 2001Date of Patent: February 4, 2003Assignee: Cuno IncorporatedInventors: Mark T Meyering, Jack H. Vining, Jr., C. Thomas Badenhop
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Patent number: 6464084Abstract: A fluid filtration cell is disclosed which includes a separator disposed between two media elements having outer peripheries which are secured together by an edge seal. The media elements are formed from a material which swells in size due to fluid absorption. The edge seal is formed from a thermoplastic material having a modulus of elasticity which is sufficient to permit radial expansion of the edge seal when the cell media swells in size.Type: GrantFiled: February 8, 2001Date of Patent: October 15, 2002Assignee: Cuno IncorporatedInventor: John L. Pulek
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Patent number: 6458269Abstract: A filter assembly is disclosed including a cartridge member having a body portion and a cylindrical neck portion depending from the body portion, the neck portion having at least one lug depending radially outwardly therefrom having a keyed surface formation thereon, and a reception member defining an axial bore for receiving the neck portion of the cartridge member, the bore having at least one reception area provided therein for receiving the at least one lug, the reception area having a compatible mating surface formation defined therein for engaging the keyed surface formation on the lug so as to prevent engagement with an incompatible cartridge member.Type: GrantFiled: April 20, 2000Date of Patent: October 1, 2002Assignee: Cuno IncorporatedInventors: Laurence W. Bassett, William Contaxis, III, Bruce G. Taylor, David A. Carbo
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Patent number: 6413070Abstract: Systems and methods for the manufacture of reinforced, three-zone, microporous phase inversion membrane having any one of a plurality of different possible pore sizes in any of the three zones from at least a single mother dope batch is disclosed. The systems and methods include formulating at least a single mother batch of dope in a vessel preferably maximizing the non-solvent to solvent ratio for a given weight percentage of polymer for use in a microporous phase inversion membrane production operation to produce three-zone phase inversion membranes having one of a plurality of different predetermined pore sizes in any or all of the three zones. The at least one mother dope batch is controllably formulated in at least one vessel such that the temperature of the dope does not exceed a predetermined maximum mixing temperature and is maintained at a relatively low temperature (lower than the mixing temperature) suitable for storage.Type: GrantFiled: March 9, 2000Date of Patent: July 2, 2002Assignee: Cuno IncorporatedInventors: Mark T. Meyering, William R. Kelly, Jack H. Vining, C. Thomas Baddenhop, Joseph G. Wallace
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Patent number: 6391200Abstract: A spiral wound filter element is disclosed which includes alternating layers of filter medium and diffusion medium wrapped about a cylindrical core defining a central axis of the filter element. The alternating layers extend from a radially innermost layer of the filter element to a radially outermost layer of the filter element, the diffusion medium is defined by a continuous lengthwise sheet of mesh material, and the filter medium is defined by at least one sheet of filter material arranged along the length of the continuous sheet of mesh material. The alternating layers of filter medium and diffusion medium define three distinct radially disposed layered filtering sections surrounding the cylindrical core, and include a first filtering section having radially outer prequalifying layers, a second filtering section having middle prequalifying layers and a third filtering section having radially inner qualifying layers.Type: GrantFiled: October 5, 1999Date of Patent: May 21, 2002Assignee: Cuno IncorporatedInventors: John L. Pulek, Thomas J. Hamlin, Richard Sale, C. Thomas Paul
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Patent number: 6325929Abstract: A filtration device having a base portion including a sump which has an inlet and an outlet and which accommodates a filter element. The base has a reception port for receiving the filter element. The sump optionally is enclosed by a housing which is engaged to a portion of the base.Type: GrantFiled: October 4, 2000Date of Patent: December 4, 2001Assignee: Cuno IncorporatedInventor: Laurence W. Bassett
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Patent number: 6315130Abstract: A filter element according to the present disclosure includes a plurality of longitudinally extending pleats including outwardly radiating primary pleats and inwardly radiating secondary pleats, with at least one secondary pleat positioned between two adjacent primary pleats. Each primary pleat has a predetermined radial height, and each secondary pleat has a radial height that is less than the radial height of each primary pleat and different from the radial height of at least one other secondary pleat. A filter element according to the present disclosure provides greater filter area, an increased overall filter density, and access to more radial flow paths at the outer diameter of the filter element.Type: GrantFiled: January 7, 2000Date of Patent: November 13, 2001Assignee: Cuno IncorporatedInventor: Daniel K. Olsen
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Patent number: 6258409Abstract: A method for sealing the edges of a filter sheet (10) with wax to create a fluid-impermeable wax seal (11) enclosing a non-sealed portion (12). The method includes applying melted wax to the edges of the filter sheet, heating the treated filter sheet such that the wax permeates through the edges thereof, and then allowing the filter sheet to cool such that the wax congeals. The wax of the fluid-impermeable wax layer (11) has a durometer reading of about 75 to about 100 Shore A hardness at 25° C. and 85° C., a melt point of about 110° C. to about 180° C., a viscosity of less than about 100 cp at 155° C. and preferably includes ethylene bis stearamide. The wax layer increases the useful life of the filter sheet while providing a sheet which is easily released from a filter press and which retains integrity along the seal during repeated hot water sanitations.Type: GrantFiled: September 7, 2000Date of Patent: July 10, 2001Assignee: Cuno IncorporatedInventors: Richard D. Sale, Mark W. Schimmel, Richard A. Prince, Norbert Roessler
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Patent number: 6168722Abstract: A method for retrieving excess pharmaceutical process fluid from the hold-up volume of a primary fluid filtration device. The hold-up volume is the volume of excess process fluid which accumulates in the bottom of the filter housing below the outlet opening thereof. Because it is considered valuable, the excess pharmaceutical process fluid is retrieved from the lower housing (22) via a drainage port (23) formed therein below the level of the outlet. The excess process fluid is then filtered in a supplemental filtration device (100) that is connected to the drainage port. The supplemental filtration device has a smaller volumetric capacity than the capacity of the primary fluid filtration device.Type: GrantFiled: June 23, 1999Date of Patent: January 2, 2001Assignee: Cuno IncorporatedInventors: Daniel K. Olsen, John L. Pulek, Jeffrey A. Lucas, Laurie Iturrino, Thomas J. Hamlin, Eric Cizek, Clifford L. Schorr
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Patent number: 6139739Abstract: A combination filter element comprising a bundle of hollow microporous fibers housed within an extruded carbon block, wherein the carbon block is fabricated to balance particle retention capacity against absorption capacity to provide a composite filter with desirable pressure drop, filter life, and particulate and chemical contamination reduction, and a filtration device, in which combination filter element may be employed, having a base portion including a sump which has an inlet and an outlet and a base which has a reception port for receiving the filter element.Type: GrantFiled: April 27, 1999Date of Patent: October 31, 2000Assignee: Cuno IncorporatedInventors: Thomas J. Hamlin, William Contaxis, III, Wei-Chih Chen, Laurence W. Bassett
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Patent number: 6139741Abstract: A filter system (50) includes first and second filter heads each including a housing receptacle and a filter receptacle. The second filter head (10) includes an inlet (42) providing fluid communication to the housing receptacle; an unfiltered-fluid outlet (44) connected to the inlet of the first filter head (9) via an unfiltered-fluid line (64); and a filtered-fluid outlet (46) providing fluid communication to the filter receptacle and connected to the filtered-fluid opening (32) of the first head via a filter-fluid line (62). A filtered-fluid outlet (47) is provided in the first head for filtered fluid to leave the system. A plug (34) is also included to prevent fluid communication between the filtered- and unfiltered-fluid outlets within the bore (24) of the second filter head.Type: GrantFiled: June 19, 1998Date of Patent: October 31, 2000Assignee: Cuno IncorporatedInventor: Donald McGibbon
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Patent number: 6132608Abstract: A filter sheet positioned between plates (14) of a filter press has a fluid-impermeable wax layer (11) sealing the sheet's perimeter. The wax preferably comprises ethylene bis stearamide and has a durometer reading of about 75 to about 100 Shore A hardness at 25.degree. C. and 85.degree. C., a melt point of about 110.degree. C. to about 180.degree. C., and a viscosity of less than about 100 cp at 155.degree. C. The wax layer increases the useful life of the filter sheet while providing a sheet which is easily released from a filter press and which retains integrity along the seal during repeated hot water sanitations.Type: GrantFiled: September 29, 1998Date of Patent: October 17, 2000Assignee: Cuno IncorporatedInventors: Richard D. Sale, Mark W. Schimmel, Richard A. Prince, Norbert Roessler
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Patent number: 6103122Abstract: A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uniformly throughout a cross-section of said matrix. A process for removing ionic impurities from a photoresist solution is also provided which comprises passing the photoresist solution through said filter sheet to remove ionic impurities therefrom.Type: GrantFiled: July 30, 1997Date of Patent: August 15, 2000Assignee: Cuno IncorporatedInventors: Kenneth C. Hou, Eugene A. Ostreicher, Richard D. Sale
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Patent number: 6048298Abstract: A method is disclosed for forming a filter cartridge which includes the steps of providing a cylindrical filter element having a plurality of radially extending longitudinal pleats, engaging an outer periphery of the cylindrical filter element along a substantial portion of the length thereof, and simultaneously moving the plurality of radially extending longitudinal pleats into a laid-over spiraled configuration along the entire length of the cylindrical filter element to form a spiral pleated filter element. An apparatus is also disclosed for effectuating the disclosed method.Type: GrantFiled: February 2, 1999Date of Patent: April 11, 2000Assignee: Cuno IncorporatedInventors: C. Thomas Paul, John A. Corey
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Patent number: 5965019Abstract: A fluid filtration device is disclosed which includes a capsule housing having an upper housing portion defining an axial fluid inlet and a lower housing portion defining an axial fluid outlet, a filter assembly including an elongated mounting post and a plurality of filtration cells supported on the mounting post in axially spaced apart relationship, and structure operatively associated with the mounting post and the lower housing portion for effectuating axial compression of the filtration cells relative to the mounting post when the mounting post is engaged in the lower housing portion during assembly.Type: GrantFiled: November 11, 1997Date of Patent: October 12, 1999Assignee: Cuno IncorporatedInventors: Daniel K. Olsen, John L. Pulek, Jeffrey A. Lucas, Laurie Iturrino, Thomas J. Hamlin, Eric Cizek, Clifford L. Schorr
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Patent number: 5928588Abstract: A process for the manufacture of porous structures comprises forming a dry mixture comprising a component providing primary separation capability, a component providing green strength reinforcement capability and, a component providing binding capability and selected from the group consisting of thermoplastic and thermosetting polymers; delivering the mixture to a suitable surface and building a desired thickness thereof; densifying the mixture into tile form desired for the porous structure; removing the densified porous structure from the surface; binding the component providing the primary separation capability by melting the mixture to a temperature of up to about 20.degree. C. higher than the melting point of any thermoplastic component providing binding capability.Type: GrantFiled: November 13, 1997Date of Patent: July 27, 1999Assignee: Cuno, IncorporatedInventors: Wei-Chih Chen, Ronald V. Repetti, Jack Slovak
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Patent number: 5882517Abstract: A process for the manufacture of porous structures comprises forming a dry mixture comprising a component providing primary separation capability, a component providing green strength reinforcement capability and, a component providing binding capability and selected from the group consisting of thermoplastic and thermosetting polymers; delivering the mixture to a suitable surface and building a desired thickness thereof; densifying the mixture into the form desired for the porous structure; removing the densified porous structure from the surface; binding the component providing the primary separation capability by melting the mixture to a temperature of up to about 20.degree. C. higher than the melting point of any thermoplastic component providing binding capability.Type: GrantFiled: September 10, 1996Date of Patent: March 16, 1999Assignee: Cuno IncorporatedInventors: Wei-Chih Chen, Ronald V. Repetti, Jack Slovak
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Patent number: 5882288Abstract: A method is disclosed for forming a filter cartridge which includes the steps of providing a cylindrical filter element having a plurality of radially extending longitudinal pleats, engaging an outer periphery of the cylindrical filter element along a substantial portion of the length thereof, and simultaneously moving the plurality of radially extending longitudinal pleats into a laid-over spiraled configuration along the entire length of the cylindrical filter element to form a spiral pleated filter element. An apparatus is also disclosed for effectuating the disclosed method.Type: GrantFiled: January 16, 1998Date of Patent: March 16, 1999Assignee: Cuno IncorporatedInventors: C. Thomas Paul, John A. Corey
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Patent number: D413961Type: GrantFiled: October 8, 1998Date of Patent: September 14, 1999Assignee: Cuno IncorporatedInventor: Laurence W. Bassett