Patents by Inventor Stewart A. Davis
Stewart A. Davis 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: 9411076Abstract: Provided is a polymerizable composition including: (a) a polymerizable component; and (b) a pigment component the pigment component includes: (i) an ionic or amphoteric dispersant material; and (ii) pigment nanoparticles uniformly dispersed in the dispersant material (i). The nanoparticles have a particle size of up to 500 nanometers. Also provided is a polymerizable composition of: (a) a polymerizable component including: (i) diethylene glycol bis(allyl carbonate); and (ii) a radical initiator; and (b) a pigment component which includes: (i) an ionic or amphoteric dispersant material derived from polycaprolactone; and (ii) pigment nanoparticles of ultramarine blue having an average particle size of up to 500 nanometers, uniformly dispersed in the dispersant material.Type: GrantFiled: September 12, 2013Date of Patent: August 9, 2016Assignee: PPG Industries Ohio, Inc.Inventors: Brandy D. Slezak, Royann L. Stewart-Davis, Robert D. Herold, Mark P. Bowman, Joseph S. Szul
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Publication number: 20140080972Abstract: Provided is a polymerizable composition including: (a) a polymerizable component; and (b) a pigment component the pigment component includes: (i) an ionic or amphoteric dispersant material; and (ii) pigment nanoparticles uniformly dispersed in the dispersant material (i). The nanoparticles have a particle size of up to 500 nanometers. Also provided is a polymerizable composition of: (a) a polymerizable component including: (i) diethylene glycol bis(allyl carbonate); and (ii) a radical initiator; and (b) a pigment component which includes: (i) an ionic or amphoteric dispersant material derived from polycaprolactone; and (ii) pigment nanoparticles of ultramarine blue having an average particle size of up to 500 nanometers, uniformly dispersed in the dispersant material.Type: ApplicationFiled: September 12, 2013Publication date: March 20, 2014Applicant: PPG INDUSTRIES OHIO, INC.Inventors: Brandy D. Slezak, Royann L. Stewart-Davis, Robert D. Herold, Mark P. Bowman, Joseph S. Szul
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Patent number: 7897259Abstract: Silicon compounds useful as coating reactants for the chemical vapor deposition of silicon oxide are disclosed, along with compounds useful as accelerants to increase the deposition rate of silicon oxide. The silicon-containing precursor comprises the structural formula wherein R1 is an alkyl, alkenyl, alkynyl or aryl radical which may be substituted, and R2 is a functional group which increases the reactivity of the silicon compound by withdrawing electron density away from the silicon atom, such as hydrogen, halogen, alkenyl, alkynyl, halogenated alkyl and perhalogenated alkyl radicals. The accelerant is a compound selected to take advantage of the partial positive charge on the silicon atom. Such accelerant compounds include Lewis acids and bases; water; ozone; trivalent compounds of nitrogen, boron and phosphorus; tetravalent compounds of sulfur and selenium; pentavalent compounds of phosphorus and a variety of metal compounds.Type: GrantFiled: April 9, 1998Date of Patent: March 1, 2011Assignee: PPG Industries Ohio, Inc.Inventors: David E. Lococq, George A. Neuman, Royann L. Stewart-Davis
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Publication number: 20060046010Abstract: A support structure is applied directly to the first side of a semiconductor work piece or wafer by a stereolithographic process layer by layer completely about and extending inwardly of the periphery of the wafer, but external to the selected area within which a desired circuitry pattern is placed, the support structure being of a desired height and of a material resistive to an acid etch process effective to seal the circuitry pattern in the selected area from acid when the work piece is subjected to an acid etch on the opposing second side and about the periphery. The support structure further strengthens the work piece against flexural failure.Type: ApplicationFiled: October 21, 2005Publication date: March 2, 2006Applicant: 3D Systems, Inc.Inventors: Stewart Davis, Grant Flaharty
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Publication number: 20040229002Abstract: A support structure is applied directly to the first side of a semiconductor work piece or wafer by a stereolithographic process layer by layer completely about and extending inwardly of the periphery of the wafer, but external to the selected area within which a desired circuitry pattern is placed, the support structure being of a desired height and of a material resistive to an acid etch process effective to seal the circuitry pattern in the selected area from acid when the work piece is subjected to an acid etch on the opposing second side and about the periphery. The support structure further strengthens the work piece against flexural failure.Type: ApplicationFiled: May 15, 2003Publication date: November 18, 2004Applicant: 3D Systems, Inc.Inventors: Stewart A. Davis, Grant R. Flaharty
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Publication number: 20040166158Abstract: PEG-chitosan conjugates comprising chitosan and polyethylene glycol moieties or derivatives thereof which are bonded together and their use in medicine is described. In one embodiment, the conjugate comprises a chitosan moiety or a derivative thereof and a polyethylene glycol moiety or a derivative thereof which are bonded together via the amino function on the chitosan by the use of an activated chitosan species. In another embodiment, the conjugate comprises a chitosan moiety or a derivative thereof and a polyethylene glycol moiety or a derivative thereof which are bonded together, the chitosan portion of the conjugate having a molecular weight in the range of from 10 kilodaltons to 1000 kilodaltons.Type: ApplicationFiled: February 25, 2004Publication date: August 26, 2004Applicant: West Pharmaceutical Services Drug Delivery & Clinical Research Centre Limited.Inventors: Stanley Stewart Davis, Wu Lin, Fabio Bignotti, Paolo Ferruti
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Patent number: 6730735Abstract: PEG-chitosan conjugates comprising chitosan and polyethylene glycol moieties or derivatives thereof which are bonded together and their use in medicine is described. In one embodiment, the conjugate comprises a chitosan moiety or a derivative thereof and a polyethylene glycol moiety or a derivative thereof which are bonded together via the amino function on the chitosan by the use of an activated chitosan species. In another embodiment, the conjugate comprises a chitosan moiety or a derivative thereof and a polyethylene glycol moiety or a derivative thereof which are bonded together, the chitosan portion of the conjugate having a molecular weight in the range of from 10 kilodaltons to 1000 kilodaltons.Type: GrantFiled: January 24, 2003Date of Patent: May 4, 2004Assignee: West Pharmaceutical Services Drug Delivery & Clinical Research Centre LimitedInventors: Stanley Stewart Davis, Wu Lin, Fabio Bignotti, Paolo Ferruti
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Patent number: 6677438Abstract: A process for attaching a polyethylene glycol compound to a macromolecule to prepare a conjugate or adduct between the polyethylene glycol compound and the macromolecule is described. The process comprises the steps of (1) preparing an activated PEG or an activated PEG derivative by incorporating an acrylic ester, an acrylic thioester or an acrylamido group into the PEG or PEG derivative; (2) reacting the activated PEG or PEG derivative with a macromolecular material comprising one or more sulphydryl groups, primary amino groups and/or secondary amino groups and (3) recovering the conjugate of the PEG or PEG derivative and the macromolecular material.Type: GrantFiled: July 21, 2000Date of Patent: January 13, 2004Assignees: University of Nottingham, Universita Degli Studi di BresciaInventors: Martin Charles Garnett, Stanley Stewart Davis, Fabio Bignotti, Paolo Ferruti
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Patent number: 6635254Abstract: Lamellar particles are provided comprising a biodegradable and biocompatible polymer and carrying a cationic charge on their surface. These particles are prepared by mixing a preformed negatively charged lamellar particle with a positively charged material. Compositions using these particles may include genetic material or antigens, for example, and may be used as a drug delivery system, such as a sustained release system.Type: GrantFiled: September 6, 2001Date of Patent: October 21, 2003Assignee: West Pharmaceutical Services Drug Delivery & Clinical Research Centre LimitedInventors: Stanley Stewart Davis, Andrew Wells
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Publication number: 20030166783Abstract: PEG-chitosan conjugates comprising chitosan and polyethylene glycol moieties or derivatives thereof which are bonded together and their use in medicine is described. In one embodiment, the conjugate comprises a chitosan moiety or a derivative thereof and a polyethylene glycol moiety or a derivative thereof which are bonded together via the amino function on the chitosan by the use of an activated chitosan species. In another embodiment, the conjugate comprises a chitosan moiety or a derivative thereof and a polyethylene glycol moiety or a derivative thereof which are bonded together, the chitosan portion of the conjugate having a molecular weight in the range of from 10 kilodaltons to 1000 kilodaltons.Type: ApplicationFiled: January 24, 2003Publication date: September 4, 2003Applicant: West Pharmaceutical Services Drug Delivery and Clinical Research Center LimitedInventors: Stanley Stewart Davis, Wu Lin, Fabio Bignotti, Paolo Ferruti
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Patent number: 6413941Abstract: A composition for delivering a biologically active polyanionic molecule comprising a linear polymer with a backbone comprising amido and tertiary amino groups arranged regularly on the backbone and biologically active polyanionic molecule bound to the polymer. Preferably, the linear polymer comprises a poly(amidoamine). Preferably, the biologically active polyanionic molecule is a nucleic acid, more preferably a DNA. The compositions are useful for delivering nucleic acids to a cell in a cell transformation, transfection or gene therapy method.Type: GrantFiled: August 3, 1998Date of Patent: July 2, 2002Assignee: West Pharmaceutical Services Drug Delivery & Clinical Research Centre LimitedInventors: Martin Charles Garnett, Fiona Caroline Maclaughlin, Stanley Stewart Davis, Fabio Bignotti, Paolo Ferruti
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Publication number: 20020068091Abstract: Lamellar particles are provided comprising a biodegradable and biocompatible polymer and carrying a cationic charge on their surface. These particles are prepared by mixing a preformed negatively charged lamellar particle with a positively charged material. Compositions using these particles may include genetic material or antigens, for example, and may be used as a drug delivery system, such as a sustained release system.Type: ApplicationFiled: September 6, 2001Publication date: June 6, 2002Applicant: West Pharmaceutical Services Drug Delivery & Clinical Research Centre LimitedInventors: Stanley Stewart Davis, Andrew Wells
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Patent number: 6383513Abstract: There is provided a composition for the nasal delivery of a cannabinoid which comprises a cannabinoid in a biphasic delivery system or a cannabinoid in a microsphere delivery system.Type: GrantFiled: June 16, 2000Date of Patent: May 7, 2002Assignee: West Pharmaceutical Services Drug Delivery & Clinical Research Centre LimitedInventors: Peter James Watts, Stanley Stewart Davis
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Publication number: 20020044972Abstract: A composition is provided including: (a) a nucleic acid or an oligonucleotide; and (b) a block copolymer containing a hydrophilic block that carries functional groups that provide the block with a positive charge. These compositions may be used to deliver a nucleic acid or an oligonucleotide to a cell.Type: ApplicationFiled: August 31, 2001Publication date: April 18, 2002Applicant: West Pharmaceutical Services Drug Delivery & Clinical Research Centre, Ltd.Inventors: Stanley Stewart Davis, Lisbeth Illum, Burhan Daudali
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Publication number: 20010055569Abstract: The present invention provides a composition comprising an oil-in-water emulsion and a drug dissolved in the emulsion. The oil phase comprises a hydroxylated oil, particularly a hydroxylated vegetable oil. The preferred hydroxylated vegetable oil is castor oil.Type: ApplicationFiled: April 24, 2001Publication date: December 27, 2001Applicant: West Pharmaceutical Services Drug Delivery & Clinical Research Centre, LtdInventors: Stanley Stewart Davis, Lisbeth Illum
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Patent number: 6001395Abstract: The invention provides a composition for delivery of an active agent comprising a plurality of lamellar particles of a biodegradable polymer which is at least in part crystalline, and an active agent adsorbed to at least most of the particles. Preferably the biodegradablepolymer is at least 5% by weight crystalline. Preferred biodegradable polymers are poly(L-lactide) (L.PLA) or copolymers or blends of L.PLA. The particles are especially useful for the immobilization of antigens or allergens for vaccines.Type: GrantFiled: March 30, 1998Date of Patent: December 14, 1999Assignee: Danbiosyst UK LimitedInventors: Allan Gerald Arthur Coombes, Stanley Stewart Davis, Diane Lisa Major, John Michael Wood
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Patent number: 5922357Abstract: The invention relates to microspheres which are suitable for biomedical uses which have a diameter in the range of 10 nm to 2 mm and which comprise a substantially spherical core particle of a non-water-soluble polymer and an outer surface layer consisting substantially of a water-soluble polymer. The water-soluble polymer is conjugated to polyethylene glycol and the non-water-soluble core particle is attached to the water-soluble polymer by the polyethylene glycol moiety. The microspheres are prepared by dissolving the non-water-soluble polymer in a suitable first solvent, dispersing the polymer solution in a solution of the PEG/water-soluble polymer conjugate and evaporating the first solvent to form microspheres in which the PEG anchors the water-soluble polymer to the core particle.Type: GrantFiled: March 4, 1997Date of Patent: July 13, 1999Assignees: University of Nottingham, University of GentInventors: Allan Gerald Arthur Coombes, Stanley Stewart Davis, Etienne Honore Schacht
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Patent number: 5869103Abstract: Provided are biodegradable microparticles, which exhibit a linear release profile of active agent, and methods for making the microparticles. The microparticles include a mixture of a biodegradable polymer, a water soluble polymer, and an active agent. Preferred biodegradable polymers include lactide homopolymers or copolymers of lactide and glycolide, and preferred water soluble polymers include poly(ethylene glycol) (PEG) or PEG copolymers. The microparticles are made using an emulsion/solvent extraction method, in which the continuous phase of the secondary emulsion contains an organic solvent that is miscible with the organic solvent in the primary emulsion.Type: GrantFiled: April 4, 1997Date of Patent: February 9, 1999Assignee: Danbiosyst UK LimitedInventors: Ming-Kung Yeh, Alan Gerald Coombes, Paul George Jenkins, Stanley Stewart Davis
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Patent number: 5776236Abstract: Silicon compounds useful as coating reactants for the chemical vapor deposition of silicon oxide are disclosed, along with compounds useful as accelerants to increase the deposition rate of silicon oxide. The silicon-containing precursor comprises the structural formula ##STR1## wherein R.sub.1 is an alkyl, alkenyl, alkynyl or aryl radical which may be substituted, and R.sub.2 is a functional group which increases the reactivity of the silicon compound by withdrawing electron density away from the silicon atom, such as hydrogen, halogen, alkenyl, alkynyl, halogenated alkyl and perhalogenated alkyl radicals. The accelerant is a compound selected to take advantage of the partial positive charge on the silicon atom. Such accelerant compounds include Lewis acids and bases; water; ozone; trivalent compounds of nitrogen, boron and phosphorus; tetravalent compounds of sulfur and selenium; pentavalent compounds of phosphorus and a variety of metal compounds.Type: GrantFiled: July 11, 1996Date of Patent: July 7, 1998Assignee: PPG Industries, Inc.Inventors: George A. Neuman, Patricia Ruzakowski Athey, Royann L. Stewart-Davis
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Patent number: 5599387Abstract: Silicon compounds useful as coating reactants for the chemical vapor deposition of silicon oxide are disclosed, along with compounds useful as accelerants to increase the deposition rate of silicon oxide. The silicon-containing precursor comprises the structural formula ##STR1## wherein R.sup.1 is an alkyl, alkenyl, alkynyl or aryl radical which may be substituted, and R.sub.2 is a functional group which increases the reactivity of the silicon compound by withdrawing electron density away from the silicon atom, such as hydrogen, halogen, alkenyl, alkynyl, halogenated alkyl and perhalogenated alkyl radicals. The accelerant is a compound selected to take advantage of the partial positive charge on the silicon atom. Such accelerant compounds include Lewis acids and bases; water; ozone; trivalent compounds of nitrogen, boron and phosphorus; tetravalent compounds of sulfur and selenium; pentavalent compounds of phosphorus and a variety of metal compounds.Type: GrantFiled: June 7, 1995Date of Patent: February 4, 1997Assignee: PPG Industries, Inc.Inventors: George A. Neuman, Patricia R. Athey, Royann L. Stewart-Davis