Patents by Inventor David Pears
David Pears 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).
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Publication number: 20220072483Abstract: A separation membrane suitably for water separation. The membrane includes a porous substrate layer and an active layer arranged over at least a part of the substrate layer. The active layer includes a lamellar structure comprising at least two layers of treated two-dimensional material.Type: ApplicationFiled: December 20, 2019Publication date: March 10, 2022Inventors: Kangsheng LIU, David PEARS, Chris WYRES
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Patent number: 9399211Abstract: A microencapsulated catalyst-ligand system is provided comprising a catalyst and a ligand microencapsulated within a permeable polymer microcapsule shell, wherein the ligand is a polymeric ligand. Processes for the preparation of said microencapsulated catalyst-ligand system are also provided.Type: GrantFiled: August 4, 2015Date of Patent: July 26, 2016Assignee: Reaxa LimitedInventors: David A. Pears, Kevin E. Treacher, Mohammed Nisar
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Publication number: 20160030935Abstract: A microencapsulated catalyst-ligand system is provided comprising a catalyst and a ligand microencapsulated within a permeable polymer microcapsule shell, wherein the ligand is a polymeric ligand. Processes for the preparation of said microencapsulated catalyst-ligand system are also provided.Type: ApplicationFiled: August 4, 2015Publication date: February 4, 2016Inventors: David A. Pears, Kevin E. Treacher, Mohammed Nisar
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Publication number: 20070203285Abstract: A composition containing an anti-microbial agent that comprises a polymeric biguanide, either alone or in combination with at least one other microbiologically active component.Type: ApplicationFiled: April 27, 2007Publication date: August 30, 2007Inventors: David Hodge, David Pears, John Gerrard, Paula McGeechan
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Publication number: 20070027028Abstract: A microencapsulated catalyst-ligand system is prepared by dissolving or dispersing a catalyst and/or a ligand in a first phase (for example an organic phase), dispersing the first phase in a second, continuous phase (for example an aqueous phase) to form an emulsion, reacting one or more microcapsule wall-forming materials at the interface between the dispersed first phase and the continuous second phase to form a microcapsule polymer shell encapsulating the dispersed first phase core and when the first phase contains only a catalyst or a ligand, treating the microcapsules with the remaining ligand or catalyst component of the catalyst-ligand system. The catalyst is preferably a transition metal catalyst and the ligand is preferably an organic ligand. The encapsulated catalyst-ligand system may be used for conventional catalysed reactions. The encapsulated catalyst-ligand system may be recovered from the reaction medium and re-cycled.Type: ApplicationFiled: August 13, 2004Publication date: February 1, 2007Inventors: David Pears, Kevin Treacher, Mohammed Nisar
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Publication number: 20050215745Abstract: The present invention relates to polyvinyl ethers and to their use as supports for synthetic methods (organic synthesis, peptide synthesis, oligonucleotide synthesis, oligosaccharide synthesis or any other synthetic procedure) and to their use for chromatographic applications (such as affinity chromatography), immobilisation of enzymes, reagents or catalysts.Type: ApplicationFiled: December 3, 2004Publication date: September 29, 2005Inventors: Joachim Steinke, David Pears, Gabriel Cavalli-Petraglia
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Publication number: 20050014670Abstract: The present invention relates to a composition comprising: (i) an antimicrobial agent; and (ii) a non-ionic co-polymer of Formula (1) wherein: [A] is of Formula (9), [B] is of Formula (10), and [X] is of Formula (11), wherein [A] and [B] may be in any order; T is an optionally substituted substituent; L is an optionally substituted linking group; R1, R2 and R3 are each independently H, optionally substituted C1-20-alkyl or optionally substituted C3-20-cycloalkyl; R4 and R5 are each independently H or C1-4alkyl; q is 15 to 1000; p is 3 to 50; and the molar ratio of [A] to [B] (m:n), is 1:10 to 10:1; provided that R1, R2, R3, T and L do not contain an ionisable group and provided that at least one of R4 and R5 is H.Type: ApplicationFiled: May 20, 2004Publication date: January 20, 2005Inventors: David Hodge, David Pears, John Gerrard, Paula McGeechan
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Publication number: 20050013794Abstract: A composition comprising: (i) an anti-microbial agent; and (ii) an acidic co-polymer of the Formula (1) wherein: [A] is of Formula (9), [B] is of Formula (10), and [C] is of Formula (12), wherein: [X] is of Formula (11), wherein [A], [B] and [C] may occur in any order; T is an optionally substituted substituent; L and G each independently is an optionally substituted linking group; R1, R2 and R3 are each independently H, optionally substituted C1-20-alkyl or optionally substituted C3-20-cycloalkyl; R4/and R5 are each independently H or C1-4-alkyl; q is 15 to 1000; p is 3 to 50; J is an optionally substituted hydrocarbyl, group; F is an acidic substituent; b is 0, 1, or 2; m is 0 to 350; n is 1 to 75; v is 1 to 100; and w is 1 to 4; provided that at least one of R4 and R5 is H and provided that R1, R2, R3, T, L, J and G do not contain a basic group; and wherein the pka value of the acidic substituent F on the monomer from which [C] is derived is less than 5.5.Type: ApplicationFiled: May 20, 2004Publication date: January 20, 2005Inventors: David Hodge, David Pears, John Gerrard, Paula McGeechan
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Publication number: 20050009971Abstract: The present invention relates to a composition comprising: (i) an anti-microbial agent; and (ii) a basic co-polymer of the Formula (1): ?[A]m-[B]n-[D]?q??Formula (1) wherein: [A] is of Formula (9), [B] is of Formula (10), and [D] is of Formula (12), X is of Formula (11), wherein [A], [B] and [D] may occur in any order; T is an optionally substituted substituent; L and Z each independently is an optionally substituted linking group; R1, R2 and R3 are each independently H; optionally substituted C1-20-alkyl or optionally substituted C3-20-cycloalkyl; R4 and R5 are each independently H or C1-4-alkyl; E is a basic substituent; q is 15 to 1000; m is 0 to 350; n is 1 to 75; y is 1 to 100; s is 0 or 1; p is 3 to 50; and provided that at least one of R4 and R5 is H and provided that R1, R2, R3, T, L and Z do not contain an acidic group which can protonate E on [D].Type: ApplicationFiled: May 20, 2004Publication date: January 13, 2005Inventors: David Hodge, David Pears, John Gerrard, Paula McGeechan
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Publication number: 20050008534Abstract: The present invention relates to a composition comprising: (i) an anti-microbial agent comprising a polymeric biguanide, alone or in combination with at least one other microbiologically active component selected from the group consisting of quaternary ammonium compounds, monoquaternary heterocyclic amine salts, urea derivatives, amino compounds, imidazole derivatives, nitrile compounds, tin compounds or complexes, isothiazolin-3-ones, thiazole derivatives, nitro compounds, iodine compounds, aldehyde release agents, thiones, triazine derivatives, oxazolidine and derivatives thereof, furan and derivatives thereof, carboxylic acids and the salts and esters thereof, phenol and derivatives thereof, sulphone derivatives, imides, thioamides, 2-mercapto-pyridine-N-oxide, azole fungicides, strobilurins, amides, carbamates, pyridine derivatives, compounds with active halogen groups, and organometallic compounds; and (ii) an amphoteric co-polymer of the Formula (1): wherein: [A] is of Formula (9), [B] is of FoType: ApplicationFiled: May 20, 2004Publication date: January 13, 2005Inventors: David Hodge, David Pears, John Gerrard, Paula McGeechan
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Patent number: 5364891Abstract: Process for making a polymer with desired groups Y comprising reacting a precursor polymer having carbon- or nitrogen-bound --NH.sub.2 and/or --NH-- groups with at least one compound having a single enolic carbonyl group and at least one group Y. Also the polymer itself and a composition containing it.Type: GrantFiled: February 14, 1991Date of Patent: November 15, 1994Assignees: Imperial Chemical Industries PLC, ICI Resins BVInventors: David A. Pears, John G. Carey, Paul H. Stenson, Gerardus C. Overbeek
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Patent number: 5153259Abstract: A nonionic dispersing agent suitable for use in the production of aqueous polyurethane dispersions, said agent having the formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon radical containing 1-12 carbon atoms;R.sup.2 represents hydrogen or a mixture thereof with methyl and/or ethyl, at least 40% of the R.sup.2 substituents in said mixture being hydrogen;R.sup.3 represents an isocyanate-reactive organic radical;R.sup.4 represents H or an isocyanate-reactive organic radical;Z represents an alkylene radical containing 2-4 carbon atoms;m is an integer from 5 to 150, andn is 0 or 1.Type: GrantFiled: June 24, 1991Date of Patent: October 6, 1992Assignee: Imperial Chemical Industries PLCInventors: John C. Padget, David A. Pears, Stephen G. Yeates, Gerardus C. Overbeek
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Patent number: 5147925Abstract: A polyurethane polymer having desired chain-pendant or in-chain groups Y is prepared by 1) converting terminal isocyanate groups of an isocyanate-terminated polyurethane prepolymer to groups providing carbon- or nitrogen-bound --NH.sub.2 and/or --NH-- groups, and 2) chain extending modified prepolymer formed in 1) with a compound having at least two enolic carbonyl groups and also having at least one group Y which becomes chain-pendant or in-chain in the chain-extended polymer.Type: GrantFiled: February 14, 1991Date of Patent: September 15, 1992Assignees: Imperial Chemical Industries PLC, ICI Resins BVInventors: David A. Pears, Martinus P. J. Heuts
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Patent number: 5128406Abstract: A nonionic dispersing agent suitable for use in the production of aqueous polyurethane dispersions, said agent having the formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon radical containing 1-12 carbon atoms;R.sup.2 represents hydrogen or a mixture thereof with methyl and/or ethyl, at least 40% of the R.sup.2 substituents in said mixture being hydrogen;R.sup.3 represents an isocyanate-reactive organic radical;R.sup.4 represents H or an isocyanate-reactive organic radical;Z represents an alkylene radical containing 2-4 carbon atoms;m is an integer from 5 to 150, andn is 0 or 1.Type: GrantFiled: June 24, 1991Date of Patent: July 7, 1992Assignee: Imperial Chemical Industries PLCInventors: John C. Padget, David A. Pears, Stephen G. Yeates, Gerardus C. Overbeek
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Patent number: 5043098Abstract: A nonionic dispersing agent suitable for use in the production of aqueous polyurethane dispersions, said agent having the formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon radical containing 1-12 carbon atoms;R.sup.2 represents hydrogen or a mixture thereof with methyl and/or ethyl, at least 40% of the R.sup.2 substituents in said mixture being hydrogen;R.sup.3 represents an isocyanate-reactive organic radical;R.sup.4 represents H or an isocyanate-reactive organic radical;Z represents an alkylene radical containing 2-4 carbon atoms;m is an integer from 5 to 150, andn is 0 or 1.Type: GrantFiled: November 18, 1988Date of Patent: August 27, 1991Assignee: Imperial Chemical Industries PLCInventors: John C. Padget, David A. Pears, Stephen G. Yeates, Gerardus C. Overbeek
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Patent number: 5021544Abstract: A water dispersible polyester polymer is described having one or more polyester chains and one or more non-ionic polyoxyalkylene chains in which at least 40% of the repeating oxyalkylene units are oxyethylene units. The polyester polymer has a structure in which one or more of the polyoxyalkylene chains are pendent to at least one of the polyester chains. The poloxyalkylene chains provide the polyester with non-ionic stabilization enabling the polyester to form aqueous dispersions which possess good colloid stability.Type: GrantFiled: November 6, 1989Date of Patent: June 4, 1991Assignee: Imperial Chemical Industries PLCInventors: John C. Padget, David A. Pears