US Patent No: 7,226,541

Number of patents in Portfolio can not be more than 2000

Membrane polymer compositions

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ALSO PUBLISHED AS: 20040191894
ATTORNEY / AGENT: (SPONSORED)
 

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Abstract

The invention relates to a terpolymer of tetrafluoroethylene (TFE) monomer, polyvinylidene fluoride (PVDF) monomer and hexafluoropropylene (HFP) monomer for forming an ultrafiltration or microfiltration membrane, method of forming said membranes, and to the ultrafiltration or microfiltration membranes themselves. The invention also relates to a method of forming a polymeric ultrafiltration or microfiltration membrane including preparing a leachant resistant membrane dope which incorporates a leachable pore forming agent, casting a membrane from the dope and leaching the pore forming agent from the membrane. The invention also relates to a method of preparing a polymeric ultrafiltration or microfiltration membrane of improved structure including the step of adding a nucleating agent to the membrane dope before casting.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SIEMENS WATER TECHNOLOGIES HOLDING CORP.WARRENDALE, PA23

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Muller, Heinz-Joachim Thornleigh, AU 25 358
Mullette, Daniel Westmead, AU 15 84

Cited Art

Patent Info (Count) # Cites Year
 
SIEMENS INDUSTRY, INC. (13)
5,643,455 Concentration of solids in a suspension using hollow fibre membranes 90 1995
5,918,264 Fiber monitoring system 42 1995
6,159,373 Cleaning of hollow fibre membranes 41 1997
6,077,435 Filtration monitoring and control system 71 1998
6,156,200 Gas-scrubbed hollow fiber membrane module 87 1998
6,254,773 Microporous membrane filtration assembly 39 1999
6,555,005 Scouring method 61 1999
6,202,475 Predicting logarithmic reduction values 42 1999
D478913 Manifold header 32 2000
D462699 Manifold header cap 39 2000
6,524,481 Apparatus and method for cleaning membrane filtration modules 55 2001
6,641,733 Apparatus and method for cleaning membrane filtration modules 41 2002
6,884,350 Modified membranes 33 2003
 
ZENON ENVIRONMENTAL INC. (13)
5,227,063 Tubular membrane module 45 1990
5,104,535 Frameless array of hollow fiber membranes and module containing a stack of arrays 53 1990
5,182,019 Cartridge of hybrid frameless arrays of hollow fiber membranes and module containing an assembly of cartridges 56 1992
5,248,424 Frameless array of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate 139 1992
5,403,479 In situ cleaning system for fouled membranes 84 1993
5,958,243 Apparatus and method for membrane filtration with enhanced net flux 51 1997
5,910,250 Baffle for conversion of fine bubbles to coarse while filtering with a vertical skein of hollow fibers 87 1997
5,914,039 Filtration membrane with calcined .alpha.-alumina particles therein 59 1997
5,944,997 System for maintaining a clean skein of hollow fibers while filtering suspended solids 103 1998
6,045,698 Method for cleaning a filtration installation of the type with immersed membranes 61 1998
6,024,872 Method of making a dope comprising hydrophilized PVDF and .alpha.-alumina, and a membrane made therefrom 53 1999
6,214,231 System for operation of multiple membrane filtration assemblies 60 1999
6,645,374 Membrane module for gas transfer and membrane supported biofilm process 47 2003
 
ZENON TECHNOLOGY PARTNERSHIP (13)
5,639,373 Vertical skein of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate 128 1995
5,783,083 Vertical cylindrical skein of hollow fiber membranes and method of maintaining clean fiber surfaces 119 1996
6,042,677 Potted header for hollow fiber membranes and method for making it 70 1999
RE37549 Vertical skein of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate 63 1999
6,354,444 Hollow fiber membrane and braided tubular support therefor 61 1999
6,193,890 System for maintaining a clean skein of hollow fibers while filtering suspended solids 83 1999
6,375,848 Water filtration using immersed membranes 50 1999
6,245,239 Cyclic aeration system for submerged membrane modules 61 2000
6,325,928 Immersed membrane element and module 60 2000
6,294,039 Potted header for hollow fiber membranes 54 2000
6,893,568 Immersed membrane filtration system and overflow process 36 2000
6,550,747 Cyclic aeration system for submerged membrane modules 48 2001
6,620,319 Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes 50 2001
 
PALL CORPORATION (11)
4,340,479 Process for preparing hydrophilic polyamide membrane filter media and product 202 1980
4,431,545 Microporous filter system and process 80 1982
4,609,465 Filter cartridge with a connector seal 109 1984
4,702,840 Charge modified polyamide membrane 71 1986
5,417,101 Method and apparatus for testing the integrity of filter elements 64 1992
6,045,899 Highly assymetric, hydrophilic, microfiltration membranes having large pore diameters 97 1996
6,083,393 Hydrophilic membrane 45 1997
6,039,872 Hydrophilic membrane 47 1998
6,770,202 Porous membrane 44 2002
6,811,696 Hydrophobic membrane materials for filter venting applications 29 2002
6,884,375 Hydrophobic membrane materials for filter venting applications 35 2004
 
U.S. FILTER WASTEWATER GROUP, INC. (7)
4,931,186 Concentration of solids in a suspension 52 1986
4,767,539 Cleaning of hollow fiber filters utilized in lumenal gas flow 58 1987
4,876,012 Hollow fibre filter cartridge and header 46 1988
5,024,762 Concentration of solids in a suspension 48 1990
2002/0148,767 Membrane filtration manifold system 38 2001
2003/0178,365 Scouring method 38 2003
2003/0226,797 Fibre membrane arrangement 35 2003
 
3M INNOVATIVE PROPERTIES COMPANY (6)
6,096,213 Puncture-resistant polyolefin membranes 50 1998
6,277,512 Polymer electrolyte membranes from mixed dispersions 69 1999
6,423,784 Acid functional fluoropolymer membranes and method of manufacture 48 1999
6,790,912 Extrudable fluoropolymer blends 35 2001
6,861,466 Fluoropolymer dispersion containing no or little low molecular weight fluorinated surfactant 63 2004
7,041,728 Aqueous dispersions of polytetrafluoroethylene having a low amount of fluorinated surfactant 44 2004
 
THE DOW CHEMICAL COMPANY (6)
4,656,865 System for analyzing permeation of a gas or vapor through a film or membrane 61 1985
4,797,187 Semi-permeable membranes prepared via reaction of cationic groups with nucleophilic groups 49 1987
4,904,426 Process for the production of fibers from poly(etheretherketone)-type polymers 38 1988
4,963,304 Process for preparing microporous membranes 44 1988
5,015,275 Isotropic microporous syndiotactic polystyrene membranes and processes for preparing the same 36 1989
5,221,478 Chromatographic separation using ion-exchange resins 41 1992
 
ASAHI KASEI KOGYO KABUSHIKI KAISHA (4)
4,702,836 Porous fluorine resin membrane and process for preparing the same 41 1986
6,299,773 Porous polyvinylidene fluoride resin film and process for producing the same 40 1999
6,322,703 Method for purifying aqueous suspension 32 2000
6,495,041 Method for purifying aqueous suspension 30 2001
 
MEMTEC LIMITED (4)
4,816,160 Cooling hollow fibre cross-flow separators 46 1986
4,793,932 Variable volume filter or concentrator 53 1986
4,935,143 Cleaning of filters 52 1988
4,921,610 Cleaning of hollow fibre filters 76 1988
 
E. I. DU PONT DE NEMOURS AND COMPANY (3)
5,137,631 Multiple bundle permeator 56 1991
5,320,760 Method of determining filter pluggage by measuring pressures 44 1992
5,470,469 Hollow fiber cartridge 85 1994
 
JAPAN ORGANO CO., LTD. (3)
4,886,601 Column filter using bundles of long fibers 49 1989
5,209,852 Process for scrubbing porous hollow fiber membranes in hollow fiber membrane module 79 1991
5,151,191 Filtration process using hollow fiber membrane module 61 1991
 
KUBOTA CORPORATION (3)
5,192,456 Apparatus for treating activated sludge and method of cleaning it 96 1992
5,451,317 Solid-liquid separator 48 1994
5,647,988 Method of back-washing submerged-type ceramic membrane separation apparatus 60 1994
 
MEDIVATORS INC. (3)
5,543,002 Method of manufacture of hollow fiber filter cartridge with porous ring 46 1994
5,554,283 Hollow fiber filter having a porous collar/ring seal 61 1995
5,531,848 Method of manufacturing of hollow fiber cartridge with porous ring 48 1995
 
MILLIPORE CORPORATION (3)
5,079,272 Porous membrane formed from interpenetrating polymer network having hydrophilic surface 63 1989
5,211,823 Process for purifying resins utilizing bipolar interface 72 1991
5,158,721 Porous membrane formed from interpenetrating polymer network having hydrophilic surface 52 1991
 
SIEMENS WATER TECHNOLOGIES CORP. (3)
5,094,750 Hollow fibre filter cartridge and header 41 1989
5,194,149 Filter cartridge manifold 44 1991
5,405,528 Modular microporous filter assemblies 62 1992
 
TEIJIN LIMITED (3)
4,302,336 Semipermeable composite membrane 60 1979
4,353,802 Semipermeable composite membrane 48 1979
4,388,189 Process for preparation of improved semipermeable composite membranes 62 1980
 
AKZO N.V. (2)
4,744,240 Method for determining the bubble point or the largest pore of membranes or of filter materials 56 1987
5,066,401 Flat or capillary membrane based on a homogeneous mixture of polyvinylidene fluoride and a second polymer which can be rendered hydrophilic by chemical reaction 54 1990
 
EBARA CORPORATION (2)
4,775,471 Hollow fiber filter device 50 1986
4,876,006 Hollow fiber filter device 100 1988
 
KOCH MEMBRANE SYSTEMS, INC. (2)
6,074,718 Self supporting hollow fiber membrane and method of construction 36 1996
6,890,435 Hollow fiber microfiltration membranes and a method of making these membranes 38 2002
 
MEMBRANA GMBH (2)
4,708,799 Hollow fiber membrane for plasma separation 48 1985
4,968,733 Process for producing microporous powders and membranes 72 1989
 
MILLIPORE INVESTMENT HOLDINGS LIMITED (2)
4,203,848 Processes of making a porous membrane material from polyvinylidene fluoride, and products 101 1977
4,632,745 Electrodeionization apparatus 136 1985
 
MOBIL OIL CORPORATION (2)
5,069,065 Method for measuring wettability of porous rock 59 1991
5,297,420 Apparatus and method for measuring relative permeability and capillary pressure of porous rock 59 1993
 
NEPHROS, INC. (2)
6,315,895 Dual-stage hemodiafiltration cartridge 38 1999
6,635,179 Sterile fluid filtration cartridge and method for using same 37 1999
 
PTI TECHNOLOGIES, INC. (2)
4,218,324 Filter element having removable filter media member 56 1979
4,812,235 Filter element assembly replaceable mesh pack 48 1983
 
SPECIALTY MATERIALS INC. (2)
4,384,474 Method and apparatus for testing and using membrane filters in an on site of use housing 59 1981
4,888,115 Cross-flow filtration 53 1983
 
USF FILTRATION AND SEPARATIONS GROUP INC. (2)
4,629,563 Asymmetric membranes 208 1981
5,906,742 Microfiltration membranes having high pore density and mixed isotropic and anisotropic structure 57 1997
 
ABC GROUP (1)
D396726 Combined air intake manifold and filter 33 1997
 
ADVANCED CARDIOVASCULAR SYSTEMS, INC. (1)
6,994,867 Biocompatible carrier containing L-arginine 34 2002
 
AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH (1)
4,407,975 Polymeric membrane having maleic anhydride residues 32 1982
 
ASAHI GLASS COMPANY, LIMITED (1)
4,385,150 Organic solution of fluorinated copolymer having carboxylic acid groups 46 1981
 
BASF AKTIENGESELLSCHAFT (1)
6,264,839 Phosphonomethylated polyvinylamines and preparation and use thereof 32 1993
 
BAXTER INTERNATIONAL INC. (1)
4,248,648 Method of repairing leaks in a hollow capillary fiber diffusion device 48 1979
 
BAYER AKTIENGESELLSCHAFT (1)
4,968,430 Composite membranes, processes for their preparation and their use 55 1989
 
BDF IP HOLDINGS LTD. (1)
6,723,758 Graft polymeric membranes and ion-exchange membranes formed therefrom 30 2001
 
CELGARD LLC (1)
5,043,113 Process for formation of halogenated polymeric microporous membranes having improved strength properties 30 1990
 
CHAPIN MANUFACTURING, INC. (1)
6,440,303 Fluid filter 46 2001
 
CLACK CORPORATION (1)
5,389,260 Brine seal for tubular filter 64 1993
 
CMS TECHNOLOGIES HOLDINGS, INC. (1)
6,221,247 Dioxole coated membrane module for ultrafiltration or microfiltration of aqueous suspensions 41 1999
 
CORNING INCORPORATED (1)
5,275,766 Method for making semi-permeable polymer membranes 36 1992
 
COULTER ELECTRONICS, LTD. (1)
4,718,270 Porosimeter and methods of assessing porosity 54 1985
 
D.W. WALKER & ASSOCIATES (1)
5,198,116 Method and apparatus for measuring the fouling potential of membrane system feeds 45 1992
 
DELAWARE PMC-SIERRA, INC. (1)
5,479,590 Anti-aliasing method for polynomial curves using integer arithmetics 44 1994
 
DONALDSON COMPANY, INC. (1)
4,779,448 Photoelectric bubble detector apparatus and method 48 1986
 
DOW GLOBAL TECHNOLOGIES INC. (1)
6,337,018 Composite membrane and method for making the same 42 2000
 
DRAGERWERK AKTIENGESELLSCHAFT (1)
4,840,227 Process for producing a hollow fiber mass transfer module and module produced by this process 36 1988
 
DRM, DR MULLER AG (1)
4,511,471 Filter apparatus for continuously thickening suspensions 45 1983
 
EASTMAN KODAK COMPANY (1)
6,721,529 Release agent donor member having fluorocarbon thermoplastic random copolymer overcoat 51 2001
 
ECO-TEC LIMITED (1)
4,673,507 Fluid treatment process and apparatus 50 1985
 
ELECTRIC POWER RESEARCH INSTITUTE, INC. (1)
5,005,430 Automated membrane filter sampler 48 1990
 
ELF ATOCHEM S.A. (1)
5,747,605 Mixtures of polymers including a halogen-containing polymer and compatibilized with a grafted aliphatic polyester 30 1995
 
FILTERWERK MANN & HUMMEL GMBH (1)
4,688,511 Dirt accumulation indicator for air intake filters 65 1985
 
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V. (1)
5,151,193 Polymer membranes on the basis of polyvinylidene fluoride, a process for the production thereof and their use 47 1990
 
FUJIFILM MANUFACTURING EUROPE B.V. (1)
6,890,645 Photocatalytic sheet or film and its manufacturing process 30 2001
 
HENKEL CHILE S.A. (HENKEL CHILE) (1)
6,727,305 Filler-containing polymer dispersion, method for its production and its use 32 2001
 
HENKEL KOMMANDITGESELLSCHAFT AUF AKTIEN (1)
4,650,596 Pour point depressants for paraffin solutions 30 1985
 
INDUSTRIAL AIR, INC. (1)
4,193,780 Air filter construction 56 1978
 
IONICS, INCORPORATED (1)
5,147,553 Selectively permeable barriers 59 1991
 
JGC CORPORATION (1)
4,540,490 Apparatus for filtration of a suspension 70 1983
 
KABUSHIKI KAISHA ITO TEKKOUSHO (1)
4,647,377 Filter apparatus 71 1984
 
KABUSHIKI KAISHA TOSHIBA (1)
4,756,875 Apparatus for filtering water containing radioactive substances in nuclear power plants 55 1986
 
KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH (1)
4,797,211 Cross flow microfilter 89 1986
 
KURARAY CO., LTD. (1)
4,547,289 Filtration apparatus using hollow fiber membrane 70 1984
 
L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE (1)
4,670,145 Multiple bundle fluid separation apparatus 63 1986
 
LOCTITE CORPORATION (1)
5,135,663 Method of treating (meth)acrylic monomer-containing wastewater 33 1991
 
LYONNAISE DES EAUX-DUMEZ (1)
5,066,402 Method of changing operating modes in automatic water filtering apparatus using tubular membranes 84 1990
 
MASSEY-FERGUSON INC. (1)
4,192,750 Stackable filter head unit 79 1978
 
MEMCOR, INC., A CORP. OF DE (1)
4,614,109 Method and device for testing the permeability of membrane filters 64 1985
 
MEMTEC JAPAN LIMITED (1)
5,353,630 Apparatus for testing membrane filter integrity 59 1993
 
MICRON SEPARATIONS, INC. (1)
5,411,663 Alcohol-insoluble nylon microporous membranes 31 1993
 
MITSHUBISHI RAYON ENGINEERING CO., LTD. (1)
6,280,626 Membrane separator assembly and method of cleaning the assembly utilizing gas diffuser underneath the assembly 59 1999
 
MITSUBISHI RAYON CO., LTD. (1)
5,480,553 Hollow fiber membrane module 85 1993
 
MOCON, INC. (1)
4,660,411 Apparatus for measuring transmission of volatile substances through films 51 1985
 
NALCO COMPANY (1)
5,419,816 Electrolytic process and apparatus for the controlled oxidation of inorganic and organic species in aqueous solutions 60 1993
 
ORGANO CORPORATION (1)
5,525,220 Filtration equipment 30 1994
 
ORGANO CORPORATION 5-16, HONGO 5-CHOME, BUNKYO-KU (1)
5,484,528 Filtration equipment for hollow fiber module 41 1994
 
OSMONICS, INC. (1)
4,846,970 Cross-flow filtration membrane test unit 67 1987
 
OTV SA (1)
5,607,593 Installation for making water potable with submerged filtering membranes 104 1994
 
PALL FILTRATION AND SEPARATIONS GROUP INC. (1)
6,146,747 Highly porous polyvinylidene difluoride membranes 59 1998
 
PBI-DANSENSOR A/S (1)
5,138,870 Apparatus for measuring water vapor permeability through sheet materials 49 1991
 
RHONE-POULENC RECHERCHES (1)
4,810,384 Hydrophilic PVDF semipermeable membrane 63 1987
 
SCIMAT LIMITED (1)
5,198,162 Microporous films 42 1989
 
SECURTIY STATE BANK OF PINE ISLAND (1)
5,361,625 Method and device for the measurement of barrier properties of films against gases 53 1993
 
SIEMENS WATER TECHNOLOGIES HOLDING CORP. (1)
5,104,546 Pyrogens separations by ceramic ultrafiltration 62 1990
 
SNECMA (1)
5,477,731 Method and apparatus for detecting a fouled fluid filter 54 1994
 
STANDARD OIL COMPANY (INDIANA) (1)
4,188,817 Method for detecting membrane leakage 46 1978
 
SUMITOMO HEAVY INDUSTRIES, LTD. (1)
6,284,135 Membrane filter apparatus with gas discharge cleaning means 55 1998
 
TORAY INDUSTRIES, INC. (1)
5,286,324 Polytetrafluoroethylene resin porous membrane, separator making use of the porous membrane and methods of producing the porous membrane and the separator 38 1992
 
TOYO BOSEKI KABUSHIKI KAISHA (1)
4,451,369 Fluid separation apparatus 93 1981
 
U.S. FILTER/IONPURE, INC. (1)
4,687,561 Process and apparatus for treatment of fluids, particularly demineralization of aqueous solutions 88 1985
 
UBS AG (1)
5,066,375 Introducing and removing ion-exchange and other particulates from an assembled electrodeionization stack 92 1990
 
UNITED PET GROUP, INC. (1)
5,401,401 Hang on tank canister filter 59 1993
 
UNITED STATES FILTER CORPORATION (1)
4,636,296 Process and apparatus for treatment of fluids, particularly desalinization of aqueous solutions 87 1985
 
UNIVERSITY OF ARIZONA (1)
5,531,900 Modification of polyvinylidene fluoride membrane and method of filtering 52 1994
 
WATER PURE INC. (1)
4,784,771 Method and apparatus for purifying fluids 66 1987
 
X-FLOW B.V. (1)
5,076,925 Process for preparing a microporous membrane and such a membrane 68 1990
 
YAMAHA HATSUDOKI KABUSHIKI KAISHA (1)
4,763,612 Intake system for internal combustion engine 48 1987
 
ZAO STC "VALDIPOR" (1)
5,988,400 Pourous fluorocarbon membrane, method for producing thereof and cartridge filter based on said membrane 39 1997
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (9)
4,230,583 Supported anisotropic reverse osmosis membranes based on synthetic polyamides and processes for their preparation 41 1978
4,642,182 Multiple-disc type filter with extensible support 61 1985
4,999,038 Filter unit 77 1989
H1045 Air bubble leak detection test device 36 1990
5,364,527 Apparatus and process for treating water 40 1992
D396046 Steer device for an outboard motor 32 1996
6,048,454 Oil filter pack and assembly 62 1997
5,942,113 Solid-liquid separating filter medium for sewage, waste water, etc 42 1997
D400890 Automotive manifold 38 1997

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
SIEMENS INDUSTRY, INC. (26)
7,938,966 Backwash method 9 2003
8,372,282 Mixing chamber 0 2003
8,268,176 Backwash 0 2004
7,387,723 Filtration apparatus comprising a membrane bioreactor and a treatment vessel for digesting organic materials 18 2005
7,819,956 Gas transfer membrane 10 2005
7,931,463 Apparatus for potting membranes 8 2005
7,862,719 Square membrane manifold system 8 2005
8,377,305 Continuously variable aeration 0 2005
7,867,417 Membrane post treatment 3 2005
8,048,306 Scouring method 1 2005
7,455,765 Wastewater treatment system and method 12 2006
7,591,950 Submerged cross-flow filtration 11 2006
7,988,891 Monopersulfate treatment of membranes 0 2006
7,563,363 System for treating wastewater 10 2006
7,632,439 Poly(ethylene chlorotrifluoroethylene) membranes 12 2007
8,293,098 Infiltration/inflow control for membrane bioreactor 0 2007
8,182,687 Methods of minimising the effect of integrity loss in hollow fibre membrane modules 0 2008
8,318,028 Infiltration/inflow control for membrane bioreactor 0 2008
7,722,769 Method for treating wastewater 11 2008
7,718,065 Filtration method and apparatus 10 2008
7,718,057 Wastewater treatment system 10 2008
8,382,981 Frame system for membrane filtration modules 0 2009
8,057,574 Membrane post treatment 0 2009
8,287,743 Membrane cleaning with pulsed airlift pump 0 2010
8,262,778 Membrane post treatment 0 2011
8,372,276 Membrane cleaning with pulsed airlift pump 0 2011

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Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00