Patents by Inventor John David Schofield
John David Schofield 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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Patent number: 7732514Abstract: A composition comprising a plastics material, an inorganic particulate solid such as aluminium trihydrate and a coupling modified of formula A-(X—Y—CO)m(O—B—CO)nOH wherein A is a moiety containing a terminating ethylenic group with one or two adjacent carbonyl groups; X is a direct bond, O or N; Y is C1-18-alkylene or C2-18-alkenylene; B is C2-6-alkylene; m is from 1 to 4 and n is from 0 to 5 provided that when A contains two carbonyl groups adjacent to the ethylenic group then X is N. Specific examples of coupling modifiers are ?-carboxyl ethylacrylate and 5-carboxy pentyl maleimide.Type: GrantFiled: February 19, 2003Date of Patent: June 8, 2010Assignee: The Lubrizol CorporationInventors: Roger Norman Rothon, Dean Thetford, Stuart Nicholas Richards, John David Schofield
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Patent number: 7442327Abstract: Dispersions useful in making capacitors, printed circuit boards, etc., comprising an electronic particulate solid, a carrier and a dispersant of formula (1): R—(O-A-CO)x(O—B—CO)y-Z wherein R is hydrogen or a polymerisation terminating group; A is C8-20-alkylene and/or C8-20-alkenylene; B is C1-6-alkylene or a lactone thereof; Z is hydroxyl or a basic group or a moiety containing a basic group; x is from 2 to 45; Y is from 0 to 15; and the ration of x:y is not less than 3:1, the carrier is a high boiling organic liquid having a boiling point between 150 and 350° C. selected from monohydric alcohols and esters of dialkylene glycol monoalkyl esters.Type: GrantFiled: March 5, 2004Date of Patent: October 28, 2008Assignee: The Lubrizol CorporationInventors: Dean Thetford, John David Schofield
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Patent number: 7095044Abstract: A field effect transistor in which a continuous semiconductor layer comprises: a) an organic semiconductor; and, b) an organic binder which has an inherent conductivity of less than 10?6Scm?1 and a permittivity at 1,000 Hz of less than 3.3 and a process for its production comprising: coating a substrate with a liquid layer which comprises the organic semiconductor and a material capable of reacting to form the binder; and, converting the liquid layer to a solid layer comprising the semiconductor and the binder by reacting the material to form the binder.Type: GrantFiled: November 21, 2001Date of Patent: August 22, 2006Assignee: Merck Patent GmbHInventors: Beverley Anne Brown, Domenico Carlo Cupertino, Janos Veres, John David Schofield, Stephen William Leeming, Stephen George Yeates
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Patent number: 7008988Abstract: A paint comprising a film-forming resin, an organic liquid, a pigment and a dispersant of formula 1, including salts thereof (T-(O-A-CO)n(O-B-CO)mpZ wherein T is H or a polymerisation terminating group; A is C16-20-alkenylene; B is C10-20-alkylene; Z is the residue of a polyamine or polyimine; n is 2 to 50; m is 0 to 25; and p is not less than 2. Preferred dispersants are derived from poly(ricinoleic acid) and polyethylene imine.Type: GrantFiled: January 17, 2002Date of Patent: March 7, 2006Assignee: The Lubrizol CorporationInventors: Dean Thetford, John David Schofield
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Patent number: 6770704Abstract: The use of an amine functional polymer, including salts thereof, as a rheology modifier for solvent-based paints, inks, filled thermosetting resins and thermosetting resin-based gelcoats whereby the amine functional polymer contains not less that 42% by weight of the residue of one or more amine-containing monomers, or salts thereof, relative to the weight of the polymer. Preferably the amine functional polymer is obtainable from two or more monomers which contain at least one ethylenically unsaturated group such as styrene and 2-dimethylaminoethylmethacrylate.Type: GrantFiled: December 5, 2002Date of Patent: August 3, 2004Assignee: Avecia LimitedInventors: David John Cartridge, Dean Thetford, John David Schofield, Paul Gough, Stuart Nicholas Richards
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Publication number: 20040116568Abstract: A paint comprising a film-forming resin, an organic liquid, a pigment and a dispersant of formula 1, including salts thereofType: ApplicationFiled: January 23, 2004Publication date: June 17, 2004Inventors: Dean Thetford, John David Schofield
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Publication number: 20040038459Abstract: A field effect transistor in which a continuous semiconductor layer comprises:Type: ApplicationFiled: May 6, 2003Publication date: February 26, 2004Inventors: Beverley Anne Brown, Domenico Cupertino, Janos Veres, John David Schofield, Stephen William Leeming, Stephen George Yeates
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Publication number: 20030171485Abstract: The use of an amine functional polymer, including salts thereof, as a rheology modifier for solvent-based paints, inks, filled thermosetting resins and thermosetting resin-based gelcoats whereby the amine functional polymer contains not less that 42% by weight of the residue of one or more amine-containing monomers, or salts thereof, relative to the weight of the polymer. Preferably the amine functional polymer is obtainable from two or more monomers which contain at least one ethylenically unsaturated group such as styrene and 2-dimethylaminoethylmethacrylate.Type: ApplicationFiled: December 5, 2002Publication date: September 11, 2003Inventors: David John Catridge, Dean Thetford, John David Schofield, Paul Gough, Stuart Nicholas Richards
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Patent number: 6197877Abstract: A dispersant of general Formula I T—(A)n(B)p—Z (1) wherein T is hydrogen or a polymerisation terminating group; Z is an acidic or basic group or a moiety containing either an acidic or basic group; A and B are each, independently, oxyalkylene carbonyl groups derivable from &dgr;-valerolactone, &egr;-caprolactone or alkyl substituted &egr;-caprolactone provided that both are not &egr;-caprolactone or &dgr;-valerolactone; n and p are integers; and n+p is from 2 to 100; including salts thereof. Specific examples of dispersants are the reaction product of lauric acid, &dgr;-caprolactone, 7-methyl-&egr;-caprolactone with PEI, the reaction product of lauric acid, &egr;-caprolactone, &dgr;-valerolactone with PEI and the phosphate of the reaction product of dodecanol, &egr;-caprolactone and &dgr;-valerolactone.Type: GrantFiled: April 30, 1999Date of Patent: March 6, 2001Assignee: Zeneca LimitedInventors: Dean Thetford, John David Schofield, Patrick John Sunderland
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Patent number: 6197103Abstract: A composition of copper phthalocyanines containing, on average, from 0.1 to 3 methyl groups per phthalocyanine nucleus. The composition is suitable for the coloration of paints and plastics materials.Type: GrantFiled: November 10, 1994Date of Patent: March 6, 2001Assignee: Zeneca LimitedInventors: Peter Kingsley Davies, John David Schofield, John Michael McCarthy
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Patent number: 6191253Abstract: A dispersant for aqueous mill-bases obtainable by reacting a polyethylene glycol with a molar excess of a hydroxycarboxylic acid containing from 4 to 17 carbon atoms or lactone thereof and/or with a C3-4-alkylene oxide to form a polymeric diol and phosphating the diol. The preferred hydroxycarboxylic acid or lactone is &egr;-caprolactone.Type: GrantFiled: June 9, 1998Date of Patent: February 20, 2001Assignee: Zeneca LimitedInventors: John David Schofield, Dean Thetford
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Patent number: 6117935Abstract: A rheology modifier for solvent-based coatings which is a polyacrylic acid or a poly(C.sub.1-4)-alkyl acrylic acid wherein at least 30% of the --COOH groups are converted to ester and/or amide groups. Preferred compounds are esters of polyacrylic acid where about 50% of the --COOH groups are esterified with a C.sub.4-12 -alcohol.Type: GrantFiled: April 4, 1997Date of Patent: September 12, 2000Assignee: Zeneca LimitedInventors: John David Schofield, Paul Gough
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Patent number: 5954870Abstract: A composition of copper phthalocyanines containing, on average, from 0.1 to 3 methyl groups per phthalocyanine nucleus. The composition is suitable for the coloration of paints and plastics materials.Type: GrantFiled: June 7, 1995Date of Patent: September 21, 1999Assignee: Zeneca LimitedInventors: Peter Kingsley Davies, John David Schofield, John Michael McCarthy
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Patent number: 5837046Abstract: An ink jet printer ink of the kind comprising a dispersion of a pigment in a non-aqueous diluent wherein the diluent is a single phase liquid comprising a major amount of aliphatic hydrocarbon and a minor amount of a polar component, comprising oleyl alcohol alone or in combination with a least one other polar liquid such as an ether or an ester.Type: GrantFiled: July 23, 1997Date of Patent: November 17, 1998Assignee: Xaar Technology LimitedInventors: John David Schofield, John Philip Tatum, Jill Woods
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Patent number: 5785894Abstract: A dispersant for aqueous mill-bases obtainable by reacting a polyethylene glycol with a molar excess of a hydroxycarboxylic acid containing from 4 to 17 carbon atoms or lactone thereof and/or with a C.sub.3-4 -alkylene oxide to form a polymeric diol and phosphating the diol. The preferred hydroxycarboxylic acid or lactone is .epsilon.-caprolactone.Type: GrantFiled: December 13, 1996Date of Patent: July 28, 1998Assignee: Zeneca LimitedInventors: John David Schofield, Dean Thetford
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Patent number: 5753022Abstract: A method of preparing a non-aqueous dispersion of CuPc which comprises milling crude CuPc in a high boiling liquid at a temperature from 50.degree. to 150.degree. C. in the presence of a polyester amine or polyesterammonium salt and a CuPc fluidising agent. Preferred polyesterammonium salt is obtainable by reacting polyhydroxystearic acid with 3-dimethylaminopropylamine quaternised with dimethylsulphate.Type: GrantFiled: February 5, 1996Date of Patent: May 19, 1998Assignee: Zeneca LimitedInventors: John David Schofield, Dean Thetford
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Patent number: 5700395Abstract: A dispersant comprising a polyethyleneimine residue carrying polyester chains derived from a caprolactone and at least one other specified lactone or hydroxycarboxylic acid.Type: GrantFiled: September 25, 1995Date of Patent: December 23, 1997Assignee: Zeneca LimitedInventors: Dean Thetford, John David Schofield
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Patent number: RE44769Abstract: A dispersant of general Formula I T—(A)n(B)p—Z??(1) wherein T is hydrogen or a polymerisation terminating group; Z is an acidic or basic group or a moiety containing either an acidic or basic group; A and B are each, independently, oxyalkylene carbonyl groups derivable from ?-valerolactone, ?-caprolactone or alkyl substituted ?-caprolactone provided that both are not ?-caprolactone or ?-valerolactone; n and p are integers; and n+p is from 2 to 100; including salts thereof. Specific examples of dispersants are the reaction product of lauric acid, ?-caprolactone, 7-methyl-?-caprolactone with PEI, the reaction product of lauric acid, ?-caprolactone, ?-valerolactone with PEI and the phosphate of the reaction product of dodecanol, ?-caprolactone and ?-valerolactone.Type: GrantFiled: September 2, 2010Date of Patent: February 18, 2014Assignee: The Lubrizol CorporationInventors: Dean Thetford, John David Schofield, Patrick John Sunderland