Patents by Inventor Frank ONYEMAUWA

Frank ONYEMAUWA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11045773
    Abstract: Disclosed is a porous medium, e.g., a bead, fiber, or membrane, comprising a porous support and a crosslinked polymer coating, wherein the polymer of the crosslinked polymer coating comprises at least one of polymerized monomer (A), at least one of polymerized monomer (B), at least one of polymerized monomer (C), wherein monomers (A)-(C) are as defined herein. Also disclosed are methods of preparing the porous medium and of treating a fluid containing a desired protein and one or more negatively charged species or of removing metals from organic solvents used in the microelectronics industry.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: June 29, 2021
    Assignee: Pall Corporation
    Inventors: Frank Onyemauwa, Hassan Ait-Haddou
  • Patent number: 10737259
    Abstract: Disclosed is an anion exchange porous medium, e.g., a porous membrane, that includes a porous support and a crosslinked cationic polymer coating disposed thereon, wherein the cationic polymer of the crosslinked cationic polymer coating comprises polymerized monomer (A) and polymerized monomer (B) wherein A and B are as defined herein. Also disclosed are methods of preparing the anion exchange porous medium and of treating a fluid containing a biologic.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: August 11, 2020
    Assignee: Pall Corporation
    Inventors: Frank Onyemauwa, Hassan Ait-Haddou
  • Publication number: 20200070104
    Abstract: Disclosed is a porous medium, e.g., a bead, fiber, or membrane, comprising a porous support and a crosslinked polymer coating, wherein the polymer of the crosslinked polymer coating comprises at least one of polymerized monomer (A), at least one of polymerized monomer (B), at least one of polymerized monomer (C), wherein monomers (A)-(C) are as defined herein. Also disclosed are methods of preparing the porous medium and of treating a fluid containing a desired protein and one or more negatively charged species or of removing metals from organic solvents used in the microelectronics industry.
    Type: Application
    Filed: August 31, 2018
    Publication date: March 5, 2020
    Applicant: Pall Corporation
    Inventors: Frank Onyemauwa, Hassan Ait-Haddou
  • Publication number: 20200070140
    Abstract: Disclosed is an anion exchange porous medium, e.g., a porous membrane, that includes a porous support and a crosslinked cationic polymer coating disposed thereon, wherein the cationic polymer of the crosslinked cationic polymer coating comprises polymerized monomer (A) and polymerized monomer (B) wherein A and B are as defined herein. Also disclosed are methods of preparing the anion exchange porous medium and of treating a fluid containing a biologic.
    Type: Application
    Filed: August 31, 2018
    Publication date: March 5, 2020
    Applicant: Pall Corporation
    Inventors: Frank Onyemauwa, Hassan Ait-Haddou
  • Patent number: 9962662
    Abstract: Disclosed is a fluorinated polymer of the formula: R—S—P, wherein R is a fluorocarbyl group, S is sulfur, and P is: (i) polyglycerol; (ii) poly(allyl glycidyl ether); (iii) a copolymer of glycidol and allyl glycidyl ether, the copolymer having one or more allyl groups; or (iv) poly(allyl glycidyl ether) or copolymer of glycidol and allyl glycidyl ether, wherein one more of the allyl groups have been replaced with a functional group as described herein. Also disclosed is a method of preparing the fluorinated polymer. The fluorinated polymer finds use in improving the hydrophilicity of porous hydrophobic membranes such as PTFE and PVDF.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: May 8, 2018
    Assignee: Pall Corporation
    Inventors: Hassan Ait-Haddou, Frank Onyemauwa
  • Patent number: 9718924
    Abstract: Disclosed is a block copolymer of the formula: A-B-A (I) or A-B (II), wherein block A is: (i) a polymer of allyl glycidyl ether or (ii) a polymer of allyl glycidyl ether wherein one more of the allyl groups have been replaced with 1,2-dihydroxypropyl group or a group of the formula: —(CH2)a—S—(CH2)b—X, wherein a, b, and X are defined herein. The block copolymers find use as wetting agents in the preparation of porous membranes from aromatic hydrophobic polymers such as polyethersulfone. Also disclosed are methods of preparing such block copolymers and porous membranes therefrom.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: August 1, 2017
    Assignee: Pall Corporation
    Inventors: Hassan Ait-Haddou, Frank Onyemauwa
  • Patent number: 9394407
    Abstract: Disclosed are block copolymers of the formula A-B-A (I) or A-B (II), comprising blocks A and B, wherein block A is a hydrophilic polymeric segment comprising polyglycerol and block B is an aromatic hydrophobic polymeric segment. The block copolymers find use as wetting agents in the preparation of porous membranes from aromatic hydrophobic polymers such as polyethersulfone.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: July 19, 2016
    Assignee: Pall Corporation
    Inventors: Hassan Ait-Haddou, Frank Onyemauwa
  • Patent number: 9309367
    Abstract: Disclosed is a porous membrane comprising a cellulosic material and a copolymer of the formula: A-B-A (I) or A-B (II), wherein block A, for example, polyglycerol, a polymer of allyl glycidyl ether, or a copolymer of glycidol and allyl glycidyl ether, or a polymer of allyl glycidyl ether or a copolymer of glycidol and allyl glycidyl ether wherein one or more allyl groups having been replaced by hydrophilic groups. Also disclosed is a method for preparing such a membrane.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 12, 2016
    Assignee: Pall Corporation
    Inventors: Lixiang Xiao, Hassan Ait-Haddou, Frank Onyemauwa
  • Patent number: 9303133
    Abstract: Disclosed is a hydrophilic porous membrane comprising a block copolymer of the formula: A-B-A (I) or A-B (II), wherein block A is (i) a copolymer of glycidol and allyl glycidyl ether, the copolymer having one or more allyl groups; or (ii) a copolymer of glycidol and allyl glycidyl ether, wherein one or more of the allyl groups of the copolymer have been replaced with 1,2-dihydroxypropyl group or a group of the formula: —(CH2)a—S—(CH2)b—X, wherein a, b, and X are as defined herein, and block B is an aromatic hydrophobic polymeric segment, for example, polyethersulfone. Also disclosure is a method of preparing such porous membranes.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 5, 2016
    Assignee: Pall Corporation
    Inventors: Hassan Ait-Haddou, Frank Onyemauwa
  • Patent number: 9260569
    Abstract: Disclosed are block copolymers suitable for preparing hydrophilic porous membranes, wherein the block copolymers are of the formula: A-B-A (I) and A-B (II), wherein block A is (i) a copolymer of glycidol and allyl glycidyl ether, the copolymer having one or more allyl groups; or (ii) a copolymer of glycidol and allyl glycidyl ether, wherein one or more of the allyl groups of the copolymer have been replaced with 1,2-dihydroxypropyl group or a group of the formula: —(CH2)a—S—(CH2)b—X, wherein a, b, and X are as defined herein, and block B is an aromatic hydrophobic polymeric segment, for example, polyethersulfone. Also disclosed is a method of preparing such block copolymers.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: February 16, 2016
    Assignee: Pall Corporation
    Inventors: Hassan Ait-Haddou, Frank Onyemauwa
  • Patent number: 9254466
    Abstract: Disclosed are crosslinked porous membranes comprising a cellulosic material and an aromatic hydrophobic moiety or a copolymer of the formula A-B-A (I) or A-B (II), wherein block A, for example, polyglycerol, a polymer of allylglycidyl ether, or a copolymer of glycidol and allyl glycidyl ether, or a polymer of allyl glycidyl ether or a copolymer of glycidol and allyl glycidyl ether wherein one or more allyl groups having been replaced by hydrophilic groups. Block B is an aromatic hydrophobic moiety. An example of the aromatic hydrophobic moiety is polyethersulfone. Also disclosed is a method for preparing such membranes.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: February 9, 2016
    Assignee: Pall Corporation
    Inventors: Lixiang Xiao, Hassan Ait-Haddou, Frank Onyemauwa, Lauren A. Spielman, Shant M. Hambarsoomian
  • Publication number: 20150376342
    Abstract: Disclosed are block copolymers suitable for preparing hydrophilic porous membranes, wherein the block copolymers are of the formula: A-B-A (I) and A-B (II), wherein block A is (i) a copolymer of glycidol and allyl glycidyl ether, the copolymer having one or more allyl groups; or (ii) a copolymer of glycidol and allyl glycidyl ether, wherein one or more of the allyl groups of the copolymer have been replaced with 1,2-dihydroxypropyl group or a group of the formula: —(CH2)a—S—(CH2)b—X, wherein a, b, and X are as defined herein, and block B is an aromatic hydrophobic polymeric segment, for example, polyethersulfone. Also disclosed is a method of preparing such block copolymers.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Hassan AIT-HADDOU, Frank ONYEMAUWA
  • Publication number: 20150375177
    Abstract: Disclosed are crosslinked porous membranes comprising a cellulosic material and an aromatic hydrophobic moiety or a copolymer of the formula A-B-A (I) or A-B (II), wherein block A, for example, polyglycerol, a polymer of allylglycidyl ether, or a copolymer of glycidol and allyl glycidyl ether, or a polymer of allyl glycidyl ether or a copolymer of glycidol and allyl glycidyl ether wherein one or more allyl groups having been replaced by hydrophilic groups. Block B is an aromatic hydrophobic moiety. An example of the aromatic hydrophobic moiety is polyethersulfone. Also disclosed is a method for preparing such membranes.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Lixiang XIAO, Hassan AIT-HADDOU, Frank ONYEMAUWA, Lauren A. SPIELMAN, Shant M. HAMBARSOOMIAN
  • Publication number: 20150376341
    Abstract: Disclosed is a block copolymer of the formula: A-B-A (I) or A-B (II), wherein block A is: (i) a polymer of allyl glycidyl ether or (ii) a polymer of allyl glycidyl ether wherein one more of the allyl groups have been replaced with 1,2-dihydroxypropyl group or a group of the formula: —(CH2)a—S—(CH2)b—X, wherein a, b, and X are defined herein. The block copolymers find use as wetting agents in the preparation of porous membranes from aromatic hydrophobic polymers such as polyethersulfone. Also disclosed are methods of preparing such block copolymers and porous membranes therefrom.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Hassan AIT-HADDOU, Frank ONYEMAUWA
  • Publication number: 20150376340
    Abstract: Disclosed are block copolymers of the formula A-B-A (I) or A-B (II), comprising blocks A and B, wherein block A is a hydrophilic polymeric segment comprising polyglycerol and block B is an aromatic hydrophobic polymeric segment. The block copolymers find use as wetting agents in the preparation of porous membranes from aromatic hydrophobic polymers such as polyethersulfone.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Hassan AIT-HADDOU, Frank ONYEMAUWA
  • Publication number: 20150376364
    Abstract: Disclosed is a hydrophilic porous membrane comprising a block copolymer of the formula: A-B-A (I) or A-B (II), wherein block A is (i) a copolymer of glycidol and allyl glycidyl ether, the copolymer having one or more allyl groups; or (ii) a copolymer of glycidol and allyl glycidyl ether, wherein one or more of the allyl groups of the copolymer have been replaced with 1,2-dihydroxypropyl group or a group of the formula: —(CH2)a—S—(CH2)b—X, wherein a, b, and X are as defined herein, and block B is an aromatic hydrophobic polymeric segment, for example, polyethersulfone. Also disclosure is a method of preparing such porous membranes.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Hassan AIT-HADDOU, Frank ONYEMAUWA
  • Publication number: 20150375181
    Abstract: Disclosed is a fluorinated polymer of the formula: R—S—P, wherein R is a fluorocarbyl group, S is sulfur, and P is: (i) polyglycerol; (ii) poly(allyl glycidyl ether); (iii) a copolymer of glycidol and allyl glycidyl ether, the copolymer having one or more allyl groups; or (iv) poly(allyl glycidyl ether) or copolymer of glycidol and allyl glycidyl ether, wherein one more of the allyl groups have been replaced with a functional group as described herein. Also disclosed is a method of preparing the fluorinated polymer. The fluorinated polymer finds use in improving the hydrophilicity of porous hydrophobic membranes such as PTFE and PVDF.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Hassan AIT-HADDOU, Frank ONYEMAUWA
  • Publication number: 20150376362
    Abstract: Disclosed is a porous membrane comprising a cellulosic material and a copolymer of the formula: A-B-A (I) or A-B (II), wherein block A, for example, polyglycerol, a polymer of allyl glycidyl ether, or a copolymer of glycidol and allyl glycidyl ether, or a polymer of allyl glycidyl ether or a copolymer of glycidol and allyl glycidyl ether wherein one or more allyl groups having been replaced by hydrophilic groups. Also disclosed is a method for preparing such a membrane.
    Type: Application
    Filed: June 30, 2014
    Publication date: December 31, 2015
    Inventors: Lixiang XIAO, Hassan AIT-HADDOU, Frank ONYEMAUWA
  • Patent number: 8802448
    Abstract: Substrates comprising a solid support, a ligand, and a linker comprising at least one C, O, N, or S atom covalently connecting the solid support to the ligand, are disclosed, along with methods of using and making the substrates, and devices including the substrates.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: August 12, 2014
    Assignee: Pall Corporation
    Inventors: Hassan Ait-Haddou, Frank Onyemauwa, Jonathan Haigh, Samuel Nochumson
  • Publication number: 20130030154
    Abstract: Substrates comprising a solid support, a ligand, and a linker comprising at least one C, O, N, or S atom covalently connecting the solid support to the ligand, are disclosed, along with methods of using and making the substrates, and devices including the substrates.
    Type: Application
    Filed: July 23, 2012
    Publication date: January 31, 2013
    Applicant: PALL CORPORATION
    Inventors: Hassan AIT-HADDOU, Frank ONYEMAUWA, Jonathan HAIGH, Samuel NOCHUMSON