Patents Examined by Fred Zitomer
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Patent number: 6696534Abstract: Fluoropolymers consisting of alternating perfluorocyclobutane and aryl ether linkages possess suitable properties for optical waveguides and other devices using refractive properties of the polymers. Perfluorocyclobutane (PFCB) polymers having aryl groups alternating on an ether chain have shown useful physical properties for optical waveguide applications. Processes for micromolding such polymeric films by replicating a pattern or image directly from a silicon master, rather than from a polydimethyl siloxane (PDMS) mold, are disclosed.Type: GrantFiled: August 7, 2002Date of Patent: February 24, 2004Assignee: Clemson UniversityInventors: Dennis W. Smith, Hiren V. Shah, John Ballato, Stephen Foulger
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Patent number: 6689855Abstract: Fluoropolymers consisting of alternating perfluorocyclobutane and aryl ether linkages possess suitable properties for optical waveguides and other devices using refractive properties of the polymers. Perfluorocyclobutane (PFCB) polymers having aryl groups alternating on an ether chain have shown useful physical properties for optical waveguide applications. Processes for micromolding such polymeric films by replicating a pattern or image directly from a silicon master, rather than from a polydimethyl siloxane (PDMS) mold) are disclosed.Type: GrantFiled: July 16, 2002Date of Patent: February 10, 2004Assignee: Clemson UniversityInventors: Dennis W. Smith, Hiren V. Shah, John Ballato, Stephen Foulger
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Patent number: 6686426Abstract: In preparing a fluorinated thermoplastic with good flex life, high thermal conductivity and low average spherolite diameter from tetrafluoroethylene and perfluoro n-alkyl vinyl ether, perfluoro 2-propoxyalkyl vinyl ether is additionally incorporated into the fluorinated thermoplastic. A semicrystalline, thermoplastically processable copolymer is prepared, made from units of the tetrafluoroethylene, from 2 to 10% by weight of units of perfluoro n-propyl vinyl ether and from 0.1 to 6% by weight of units of perfluoro 2-propoxypropyl vinyl ether. The novel copolymer preferably contains fewer than 70 unstable end groups per 106 carbon atoms, has thermal conductivity of at least 0.19 W/mK at 23° C. and has a smooth surface with an average spherolite diameter of <5 &mgr;m. The novel terpolymer is suitable for extrusion of hose, in particular for heat exchangers, and also for ultrahigh-purity applications.Type: GrantFiled: August 28, 2001Date of Patent: February 3, 2004Assignee: 3M Innovative Properties CompanyInventors: Ralph Kaulbach, Helmut Traunspurger
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Patent number: 6680346Abstract: A phosphorus atom-containing fluorinated cation exchange membrane substantially constituted with the following repeating units (A) and (B), and a proton conduction type fuel cell using the membrane as a solid polymeric electrolyte are provided. One embodiment for the membrane is useful as a perfluoro cationic exchange membrane for use in electrolysis of sodium chloride even under severe electrolytic conditions of higher concentration, higher temperature and higher electric density. (in which m is 0 or 1, n is 2 or 3, X, Y represents H or C6H4SO3H and the ratio for the number of repeating units is (A)/(B)=1.5 to 15).Type: GrantFiled: December 15, 2000Date of Patent: January 20, 2004Assignees: Mirane Corporation, Premelec Electrode Ltd.Inventor: Kyoji Kimoto
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Patent number: 6677033Abstract: The present invention relates to in situ polymerization of fluoropolymer into porous substrates, to improve resistance to wear, tear and creep, decay, and degradation by wetting, staining and warping, and to improve durability while maintaining the appearance of the substrate.Type: GrantFiled: August 9, 2001Date of Patent: January 13, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Joy Sawyer Bloom, Kiu-Seung Lee, Robert Clayton Wheland
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Patent number: 6667369Abstract: (Meth)acrylic polymers having alkenyl or curable silyl groups at the chain ends in high functionality ratios are prepared by a process which comprises (i) preparing a (meth)acrylic polymer having halogen atoms at the chain ends, using an organohalogenated compound or a halosulfonyl compound as an initiator and a metal complex catalyst wherein the central metal atom is selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the periodic table; and (ii) transforming the halogen atom into an alkenyl group- or a curable silyl group-containing substituent. The obtained (meth)acrylic polymers form homogeneous curing materials.Type: GrantFiled: May 13, 2002Date of Patent: December 23, 2003Assignee: Kaneka CorporationInventors: Masato Kusakabe, Kenichi Kitano
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Patent number: 6667349Abstract: The present invention relates to a process for preparing gel-like anion exchangers by aminating crosslinked gel-like styrene divinybenzene bead polymers that contain halogenoalkyl groups in the presence of an inorganic salt and in the absence of organic solvents.Type: GrantFiled: October 11, 2000Date of Patent: December 23, 2003Assignee: Bayer AktiengesellschaftInventors: Holger Lütjens, Reinhold Klipper, Georg Martin, Alfred Mitschker, Michael Holzbrecher
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Patent number: 6660818Abstract: A method for producing a fluoropolymer, which comprises polymerizing a monomer containing a fluoromonomer having a polymerizable double bond, using an initiator, in a medium containing fluoroform and water, under a condition such that fluoroform is in a supercritical state.Type: GrantFiled: September 26, 2002Date of Patent: December 9, 2003Assignees: Asahi Glass Company, LimitedInventors: Yoshio Okahata, Toshiaki Mori, Yuri Tsuchiya
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Patent number: 6649715Abstract: Fluoropolymers consisting of alternating perfluorocyclobutane and aryl ether linkages possess suitable properties for optical waveguides and other devices using refractive properties of the polymers. Perfluorocyclobutane (PFCB) polymers having aryl groups alternating on an ether chain have shown useful physical properties for optical waveguide applications. Processes for micromolding such polymeric films by replicating a pattern or image directly from a silicon master, rather than from a polydimethyl siloxane (PDMS) mold, are disclosed.Type: GrantFiled: June 27, 2000Date of Patent: November 18, 2003Assignee: Clemson UniversityInventors: Dennis W. Smith, Hiren V. Shah, John Ballato, Stephen Foulger
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Patent number: 6649663Abstract: The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.Type: GrantFiled: August 21, 2000Date of Patent: November 18, 2003Assignee: Bayer AktiengesellschaftInventors: Reinhold Klipper, Werner Strüver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lütjens
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Patent number: 6646077Abstract: Peroxide curable fluoroelastomers having copolymerized units of vinylidene fluoride or tetrafluoroethylene major monomer, at least one other fluorinated major monomer, a cure site monomer having the general formula CH2═CH—(CF2)nI, where n is an integer between 2 and 8, and iodine bound at the terminal positions of polymer chains, process well and have excellent tensile properties.Type: GrantFiled: July 11, 2002Date of Patent: November 11, 2003Assignee: DuPont Dow Elastomers LLCInventor: Donald Frederick Lyons
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Patent number: 6646075Abstract: This invention relates to high molecular weight perfluorocyclobutane polymers and methods of polymerizing trifluorovinyl monomers to form high molecular weight perfluorocyclobutane polymers in the presence of a catalyst or initiator.Type: GrantFiled: November 30, 2000Date of Patent: November 11, 2003Assignee: 3M Innovative Properties CompanyInventors: Shane S. Mao, Allen Raymond Siedle
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Patent number: 6632902Abstract: A process for rotomolding using novel melt-extruded melt-fabricable TFE copolymer minicubes, wherein at least 80% of the minicubes are in the size range of 200 to 1200 &mgr;m.Type: GrantFiled: May 24, 2001Date of Patent: October 14, 2003Assignee: E. I. du Pont de Nemours and CompanyInventor: Jacob Lahijani
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Patent number: 6632847Abstract: Polymer composition, membrane comprising the same, process for production thereof and use thereof The composition described comprises 30 to 99.5% by weight of a sulfonated aromatic polyether ketone which has an ion-exchange capacity of from 1.3 to 4.0 meq (—SO3H)/g of polymer, and from 0.5 to 70% by weight of a polybenzimidazole. This composition can, as can a sulfonated polyether ketone of PEK type, be processed to give membranes, preferably used in fuel cells.Type: GrantFiled: October 22, 2001Date of Patent: October 14, 2003Assignee: Celanese Ventures GmbHInventors: Thomas Soczka-Guth, Georg Frank, Jochen Baurmeister, Jürgen Pawlik, Rüdiger Knauf
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Patent number: 6632848Abstract: A heterogeneous anion exchanger comprising from 35 to 85 mass % of an anion exchange resin and from 15 to 65 mass % of a binder polymer, wherein the anion exchange resin is made of a polymer having repeating units represented by the following formula (1): wherein R is a C3-8 alkylene group or an alkyleneoxyalkyl group having a total carbon number of from 4 to 9, R1 is a C1-4 alkyl group which may be substituted by a hydroxyl group, each of R2 and R3 is a C1-4 alkyl group, and X− is an anion, and wherein any hydrogen atom bonded to the benzene ring may be substituted by an alkyl group or a halogen atom.Type: GrantFiled: July 23, 2001Date of Patent: October 14, 2003Assignee: Asahi Glass Company, LimitedInventor: Yoshio Sugaya
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Patent number: 6627709Abstract: Polymer particles are obtained by dispersion polymerization of styrene and acrylic acid ester along with an organosilane compound. The polymer particles have simultaneously an excellent particle size distribution, a large particle size and a satisfactory molecular weight. A toner in which the polymer particles are used as binder resin is especially suitable for high image quality and high-density printing.Type: GrantFiled: April 12, 2000Date of Patent: September 30, 2003Assignee: Brother Kogyo Kabushiki KaishaInventor: Akira Endo
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Patent number: 6624206Abstract: The invention relates to processes for the preparation of free-flowing end products of strongly acidic cation exchangers. In the case of the strongly acidic cation exchangers prepared by the processes described in Patent Application P 195 48 012.0, the particle beds of the end products are not free-flowing. By additions of wetting agents or water-soluble initiators or surfactants in the polymerization stage or after the filtration of the end product and/or process engineering means, a permanent or temporary free flowability of the particle beds of the strongly acidic cation exchangers is achieved using the following processes. 1. By additions of known wetting agents in amounts of 0.25 g/l of aqueous phase or water-soluble initiators in amounts of 0.05 to 20 g/l of aqueous phase to the copolymerization system 20 minutes to 120 minutes after reaching the gel point. 2. By treatment of the strongly acidic cation exchangers with aqueous solutions of surface-active substances having a content of 0.Type: GrantFiled: February 11, 2002Date of Patent: September 23, 2003Assignee: IAB Ionenaustauscher GmbH BitterfeldInventors: Reinhard Bachmann, Lothar Feistel, Rüdiger Seidel, Karl-Heinz Siekiera, Kurt Wegewitz
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Patent number: 6624279Abstract: The invention provides water-soluble, &bgr;-hydroxy carbamate-functional materials and coating compositions, especially waterborne coating compositions, containing the carbamate-functional materials. The invention further provide a coating prepared from the coating composition and a coated substrate, especially an automotive substrate, having the coating thereon.Type: GrantFiled: January 9, 2002Date of Patent: September 23, 2003Assignee: BASF CorporationInventors: Walter H. Ohrbom, David J. Law, Patricia A. Herrel
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Patent number: 6624269Abstract: Tetrafluoroethylene (TFE) thermoprocessable copolymer microspheres having a substantially spherical shape for at least 95% by weight, the average size of the microspheres being in the range 25 &mgr;m and 2 mm, the bulk density being in the range 0.5 and 1.1 g/cm3.Type: GrantFiled: June 25, 2001Date of Patent: September 23, 2003Assignee: Solvay Solexis S.p.A.Inventors: Hua Wu, Francesco Morandi
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Patent number: RE38913Abstract: A BIOCOMPATIBLE HYDROGEL, is provided for use in the treatment of humans for cosmetic and functional defects (e.g. in mammas, vocal cords, penis, etc. as endoprostheses), in the provision of intratissue storage sites the prolonged-action medicinal preparations, in various applications as electroconductive immersion media, and in the life-long tamponing of caverns. It contains an acrylamide-based polymer produced in the presence of an initiator of radical polymerization in apyrogenic water as the dispersion medium. An increase in elasticity, shape retention capability, and stability of bulky implants, as well as corresponding therapeutic and cosmetic efficacy, mainly in the endoprosthetic applications is achieved due to the hydrogel containing cross-linked polyacrylamide produced by using a biocompatible cross-linking agent, such as methylene-bis-acrylamide, and preferably a mixture of ammonium persulfate and tetramethylethylenediamine as the initiator of polymerzation.Type: GrantFiled: August 12, 1994Date of Patent: December 6, 2005Assignee: Contura SAInventor: Boris Ivanovich Pavlyk