Patents by Inventor Stephen H. Foulger
Stephen H. Foulger 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: 8691116Abstract: Disclosed are conductive polymer inks and methods for forming the inks. The disclosed inks include a dispersion of conductive core/shell nanoparticles. The core/shell nanoparticles include a polymeric core and a shell formed of a conducting polymer. The inks can include a dispersion of the core/shell nanoparticles in a liquid carrier, such as an alcohol. The disclosed inks can be formulated to high viscosities and can be utilized in high-speed printing processes including rotogravure and flexographic printing processes. Products encompassed by the disclosure include polymer devices such as sensors, OFETs, RFID tags, printed circuit board, electrochromic devices, non-volatile memory devices, photovoltaics, and the like.Type: GrantFiled: March 23, 2007Date of Patent: April 8, 2014Assignee: Clemson UniversityInventors: Moon Gyu Han, Jay K. Sperry, Samuel T. Ingram, Stephen H. Foulger
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Publication number: 20130236416Abstract: The present invention generally relates to surface modified colloidal particles. The invention further relates to methods of preparing and methods of using the same.Type: ApplicationFiled: March 7, 2013Publication date: September 12, 2013Applicant: Clemson UniversityInventors: Parul Rungta, Michael Daniele, JR., Stephen H. Foulger, Ragini Jetty
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Patent number: 7785496Abstract: Disclosed are electrochromic inks and devices incorporating the inks as well as methods for forming the inks and the devices. The disclosed inks include a dispersion of colloidal nanocomposite particles in a liquid carrier. The colloidal nanocomposites of the disclosed inks include nanoparticle templates, e.g., silica nanoparticles, and an intrinsically conductive polymer polymerized at the template nanoparticles. The inks can include a dispersion of the colloidal nanocomposites in a liquid carrier such as an aprotic polar organic solvent. The disclosed inks can be formulated to be utilized in any desired printing process such as inkjet printing processes. Products encompassed by the invention include all-polymer electronic, optic, photonic, electro-optic, and energy devices such as sensors, OFETs, RFID tags, printed circuit board, electrochromic devices, non-volatile memory devices, photovoltaics, and the like.Type: GrantFiled: January 24, 2008Date of Patent: August 31, 2010Assignee: Clemson University Research FoundationInventors: Goo Hwan Shim, Moon Gyu Han, Stephen H. Foulger
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Patent number: 7582231Abstract: The present invention is directed to a composite having tunable radiation diffracting properties which includes a flexible, water-free polymeric matrix and a crystalline colloidal array of particles having a lattice spacing, the array being embedded in the polymeric matrix and the lattice spacing changing responsive to stress applied to the polymeric matrix, thereby causing the radiation diffracting properties to change, wherein the polymeric matrix, the lattice spacing and the radiation diffracting properties all return to their original state essentially immediately upon removal of the stress. The present inventive composite is preferably made by a process, which involves forming a preliminary hydrogel polymerized crystalline colloidal array (PCCA), dehydrating the PCCA, and then forming a final, encapsulating polymeric matrix.Type: GrantFiled: September 16, 2005Date of Patent: September 1, 2009Inventors: Stephen H. Foulger, Ping Jiang
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Patent number: 7208682Abstract: An electrical power cable with a foamed, compressible, semiconductive insulation shield which serves as both a cushioning layer and an electrical shield.Type: GrantFiled: December 11, 2002Date of Patent: April 24, 2007Assignee: Prysmian Cavi e Sistemi Energia SrLInventors: Frank L. Kuchta, Stephen H. Foulger, Jason Carden, Chengjun Liu, Andrew Maunder, Alberto Bareggi, Luca Balconi, Cristiana Scelza
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Patent number: 7008567Abstract: The present invention is directed to a composite having tunable radiation diffracting properties which includes a flexible, water-free polymeric matrix and a crystalline colloidal array of particles having a lattice spacing, the array being embedded in the polymeric matrix and the lattice spacing changing responsive to stress applied to the polymeric matrix, thereby causing the radiation diffracting properties to change, wherein the polymeric matrix, the lattice spacing and the radiation diffracting properties all return to their original state essentially immediately upon removal of the stress. The present inventive composite is preferably made by a process, which involves forming a preliminary hydrogel polymerized crystalline colloidal array (PCCA), dehydrating the PCCA, and then forming a final, encapsulating polymeric matrix.Type: GrantFiled: October 2, 2002Date of Patent: March 7, 2006Assignee: Clemson UniversityInventors: Stephen H. Foulger, Ping Jiang
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Patent number: 6946086Abstract: Crystalline colloidal arrays (CCA) which have been encapsulated in a polymer matrix to produce more robust polymerized crystalline colloidal arrays (PCCA) are provided. The PCCA's of the present invention can be in the form of a hydrogel which can be compatible for use with a biological system. The polymer matrix of the PCCA is formed of polymerized poly(ethylene glycol) based monomer units which can provide a desired functionality to the PCCA. The PCCA can be formed to exhibit a photonic bandgap at a certain wavelength. The photonic bandgap can be capable of shifting upon some form of environmental stimulation rendering the PCCA suitable for many optical applications, including active photonic switching and sensory applications.Type: GrantFiled: November 30, 2001Date of Patent: September 20, 2005Assignee: Clemson UniversityInventors: Stephen H. Foulger, Ping Jiang, Amanda C. Lattam, Travis Baughman, John Ballato, Dennis W. Smith
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Publication number: 20030122112Abstract: The present invention is directed to a composite having tunable radiation diffracting properties which includes a flexible, water-free polymeric matrix and a crystalline colloidal array of particles having a lattice spacing, the array being embedded in the polymeric matrix and the lattice spacing changing responsive to stress applied to the polymeric matrix, thereby causing the radiation diffracting properties to change, wherein the polymeric matrix, the lattice spacing and the radiation diffracting properties all return to their original state essentially immediately upon removal of the stress. The present inventive composite is preferably made by a process, which involves forming a preliminary hydrogel polymerized crystalline colloidal array (PCCA), dehydrating the PCCA, and then forming a final, encapsulating polymeric matrix.Type: ApplicationFiled: October 2, 2002Publication date: July 3, 2003Inventors: Stephen H. Foulger, Ping Jiang
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Patent number: 6569937Abstract: A conducting polymer composite that is crosslinked comprising a semicrystalline polymer minor phase with conducting filler material dispersed therein in an amount sufficient to generate a continuous conductive network in the minor phase, and which is mixed with major phase polymers, the materials being selected such that the minor phase and major phases will not engage in electrostatic interactions that promote miscibility. The minor phase being dispersed in the major phase in an amount sufficient to generate a continuous conductive network in the composite material. The composite material is crosslinked by physical or chemical means. The crosslinked conducting polymer composite having a reduced amount of conducting filler while supporting a continuous conductive network in the crosslinked polymer composite.Type: GrantFiled: July 19, 2001Date of Patent: May 27, 2003Assignee: Pirelli Cables and Systems, LLCInventors: Stephen H. Foulger, Jeffrey M. Quinn, Thierry T. Trial
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Patent number: 6514608Abstract: A semiconductive jacket material for jacketing a cable comprising a minor phase material which is a semicrystalline polymer; a conductive filler material dispersed in the minor phase material in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in the minor phase material; and a major phase material which is a polymer which when mixed with the minor phase material will not engage in electrostatic interactions that promote miscibility. The major phase material has the minor phase material dispersed therein in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in the major phase material, forming a semiconductive jacket material of a ternary composite having distinct co-continuous phases.Type: GrantFiled: July 10, 1998Date of Patent: February 4, 2003Assignee: Pirelli Cable CorporationInventor: Stephen H. Foulger
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Patent number: 6506492Abstract: A conductive polymer composite material for semiconductive jackets for cables which has a significant reduction in conductive filler content while maintaining the required conductivity and mechanical properties specified by industry. Materials and processing approaches are selected to reduce the percolation threshold of the conductive filler in the composite, while balancing the material selection with the industry-required mechanical properties of the semiconductive jacket. The semiconductive jacket material comprises a minor phase material which is a semicrystalline polymer; a conductive filler material dispersed in the minor phase material in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in the minor phase material; and a major phase material which is a polymer which when mixed with the minor phase material will not engage in electrostatic interactions that promote miscibility.Type: GrantFiled: May 7, 1999Date of Patent: January 14, 2003Assignee: Pirelli Cables & Systems, LLCInventor: Stephen H. Foulger
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Publication number: 20020118435Abstract: Crystalline colloidal arrays (CCA) which have been encapsulated in a polymer matrix to produce more robust polymerized crystalline colloidal arrays (PCCA) are provided. The PCCA's of the present invention can be in the form of a hydrogel which can be compatible for use with a biological system. The polymer matrix of the PCCA is formed of polymerized poly(ethylene glycol) based monomer units which can provide a desired functionality to the PCCA. The PCCA can be formed to exhibit a photonic bandgap at a certain wavelength. The photonic bandgap can be capable of shifting upon some form of environmental stimulation rendering the PCCA suitable for many optical applications, including active photonic switching and sensory applications.Type: ApplicationFiled: November 30, 2001Publication date: August 29, 2002Applicant: Clemson UniversityInventors: Stephen H. Foulger, Ping Jiang, Amanda C. Lattam, Travis Baughman, John Ballato, Dennis W. Smith
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Patent number: 6417265Abstract: A conducting polymer composite that is crosslinked comprising a semicrystalline polymer minor phase with conducting filler material dispersed therein in an amount sufficient to generate a continuous conductive network in the minor phase, and which is mixed with major phase polymers, the materials being selected such that the minor phase and major phases will not engage in electrostatic interactions that promote miscibility. The minor phase being dispersed in the major phase in an amount sufficient to generate a continuous conductive network in the composite material. The composite material is crosslinked by physical or chemical means. The crosslinked conducting polymer composite having a reduced amount of conducting filler while supporting a continuous conductive network in the crosslinked polymer composite.Type: GrantFiled: September 27, 1999Date of Patent: July 9, 2002Assignee: Pirelli Cables and Systems LLCInventor: Stephen H. Foulger
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Publication number: 20020004556Abstract: A conducting polymer composite that is crosslinked comprising a semicrystalline polymer minor phase with conducting filler material dispersed therein in an amount sufficient to generate a continuous conductive network in the minor phase, and which is mixed with major phase polymers, the materials being selected such that the minor phase and major phases will not engage in electrostatic interactions that promote miscibility. The minor phase being dispersed in the major phase in an amount sufficient to generate a continuous conductive network in the composite material. The composite material is crosslinked by physical or chemical means. The crosslinked conducting polymer composite having a reduced amount of conducting filler while supporting a continuous conductive network in the crosslinked polymer composite.Type: ApplicationFiled: July 19, 2001Publication date: January 10, 2002Inventors: Stephen H. Foulger, Jeffrey M. Quinn, Thierry T. Trial
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Patent number: 6331353Abstract: A strand filling compound for electrical cables, and cables including such a compound, which prevents migration of water lengthwise of the stranded wires of the conductor of the cable. The strand filling compound has a low conductive filler content without reducing the level of conductivity of the compound and is readily pumpable at temperatures above about 100° C. The strand filling compound is provided by employing an immiscible polymer blend containing conductive filler located primarily in one phase, the immiscible polymer blend being comprised of a low molecular weight polymer and a second polymer, preferably an adhesive EVA. Preferably an adhesive extender which is miscible with the low molecular weight polymer, and fine particles of a material admixed with the filling compound and/or provided as a thin layer of fine particles of a material applied over the filling compound which swells when it absorbs water are also included in the filling compound.Type: GrantFiled: August 17, 1999Date of Patent: December 18, 2001Assignee: Pirelli Cables and Systems LLCInventor: Stephen H. Foulger
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Patent number: 6315956Abstract: An electrochemical sensor which is tailored for sensitivity to specific chemical analytes by selecting proper constituents. The electrochemical sensor is comprised of an immiscible polymer blend of at least two polymers in which a conductive filler is dispersed in one of the polymers of the blend through a multiple percolation approach to compounding. When in the presence of a chemical analyte which is in either a liquid or vapor phase, one phase of the dual immiscible polymer blend swells, effecting a decrease in the conductivity, or increase in resistivity, of the polymer blend. The electrochemical sensor is reversible in that when the chemical analyte evaporates or is removed, the polymer blend returns to its original conductivity.Type: GrantFiled: March 16, 1999Date of Patent: November 13, 2001Assignee: Pirelli Cables and Systems LLCInventor: Stephen H. Foulger
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Patent number: 6317540Abstract: An optical fiber or electrical power cable with at least one electrochemical chemical analyte sensor which includes a conductive polymer which extends longitudinally along the length of the cable. The polymer has electrical properties which undergo a reversible change when in contact with a chemical analyte. The conductive polymer can be a conductive polymer composite including an immiscible polymer blend of at least two polymers and a conductive filler which is dispersed in one of the polymers of the blend through a multiple percolation process.Type: GrantFiled: February 2, 2000Date of Patent: November 13, 2001Assignee: Pirelli Cables & Systems, LLCInventors: Stephen H. Foulger, James R. Curley
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Patent number: 6284832Abstract: A conducting polymer composite that is crosslinked comprising a semicrystalline polymer minor phase with conducting filler material dispersed therein in an amount sufficient to generate a continuous conductive network in the minor phase, and which is mixed with major phase polymers, the materials being selected such that the minor phase and major phases will not engage in electrostatic interactions that promote miscibility. The minor phase being dispersed in the major phase in an amount sufficient to generate a continuous conductive network in the composite material. The composite material is crosslinked by physical or chemical means. The crosslinked conducting polymer composite having a reduced amount of conducting filler while supporting a continuous conductive network in the crosslinked polymer composite.Type: GrantFiled: October 23, 1998Date of Patent: September 4, 2001Assignee: Pirelli Cables and Systems, LLCInventors: Stephen H. Foulger, Jeffrey M. Quinn, Thierry T. Trial
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Patent number: 6277303Abstract: A conductive polymer composite material comprises: a minor phase material comprising a semicrystalline polymer; a conductive filler material dispersed in said minor phase material in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in said minor phase material; and a major phase material, said major phase material being a polymer which when mixed with said minor phase material will not engage in electrostatic interactions that promote miscibility, said major phase material having said minor phase material dispersed therein in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in said major phase material, forming a (semi)conductive ternary composite having distinct co-continuous phases.Type: GrantFiled: July 10, 1998Date of Patent: August 21, 2001Assignee: Pirelli Cable CorporationInventor: Stephen H. Foulger
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Patent number: 6197219Abstract: A conductive polymer composite material comprises: a minor phase material comprising a semicrystalline polymer; a conductive filler material dispersed in said minor phase material in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in said minor phase material; and a major phase material, said major phase material being a polymer which when mixed with said minor phase material will not engage in electrostatic interactions that promote miscibility, said major phase material having said minor phase material dispersed therein in an amount sufficient to be equal to or greater than an amount required to generate a continuous conductive network in said major phase material, forming a (semi)conductive ternary composite having distinct co-continuous phases.Type: GrantFiled: May 7, 1999Date of Patent: March 6, 2001Assignee: Pirelli Cables and Systems LLCInventor: Stephen H. Foulger