Patents by Inventor Daniel N. Levy
Daniel N. Levy 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: 20120067616Abstract: The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.Type: ApplicationFiled: November 28, 2011Publication date: March 22, 2012Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Daniel N. Levy, Kurt Aeschbach
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Process for removing fluorosurfactant from an aqueous fluoropolymer dispersion using sorbent pouches
Patent number: 7803277Abstract: A process for reducing the fluorosurfactant content of an aqueous fluoropolymer dispersion by filling a container with fluoropolymer dispersion, inserting into the container a fabric pouch containing a fluorosurfactant sorbent so that the sorbent contacts the fluorosurfactant-containing aqueous fluoropolymer dispersion in the container and retains the fluorosurfactant to reduce fluorosurfactant content of said fluorosurfactant-containing aqueous fluoropolymer dispersion, and removing the fabric pouch from the container.Type: GrantFiled: February 13, 2008Date of Patent: September 28, 2010Assignee: E.I. du Pont de Nemours and CompanyInventors: Charles Joseph Noelke, Clay Woodward Jones, Daniel N. Levy, Michael Gene McClusky, David William Johnson -
Publication number: 20100218968Abstract: The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.Type: ApplicationFiled: May 12, 2010Publication date: September 2, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Daniel N. Levy, Kurt Aeschbach
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Publication number: 20080135488Abstract: A process for reducing the fluorosurfactant content of an aqueous fluoropolymer dispersion by filling a container with fluoropolymer dispersion, inserting into the container a fabric pouch containing a fluorosurfactant sorbent so that the sorbent contacts the fluorosurfactant-containing aqueous fluoropolymer dispersion in the container and retains the fluorosurfactant to reduce fluorosurfactant content of said fluorosurfactant-containing aqueous fluoropolymer dispersion, and removing the fabric pouch from the container.Type: ApplicationFiled: February 13, 2008Publication date: June 12, 2008Applicant: E. I. du Pont de Nemours and CompanyInventors: Charles Joseph Noelke, Clay Woodward Jones, Daniel N. Levy, Michael Gene McClusky, David William Johnson
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Patent number: 6956078Abstract: An aqueous dispersion composition of about 30 to about 70 weight % non-melt-processible fluoropolymer particles having a standard specific gravity (SSG) of less than 2.225 and about 2 to about 11 weight % surfactant based on the weight of said fluoropolymer comprising a compound or mixture of compounds of the formula: R(OCH2CH2)nOH wherein R is a branched alkyl, branched alkenyl, cycloalkyl, or cycloalkenyl hydrocarbon group having 8-18 carbon atoms and n is an average value of 5 to 18. The fluoropolymer particles of the dispersion comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. Preferably, the aqueous dispersion composition comprises about 45 to about 65 weight % non-melt-processible fluoropolymer particles.Type: GrantFiled: March 13, 2002Date of Patent: October 18, 2005Assignee: E.I. du Pont de Nemours and CompanyInventors: Robert John Cavanaugh, Clay Woodward Jones, Kazuo Konabe, Daniel N. Levy, Philippe Andre Fernand Thomas, Theodore A. Treat
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Publication number: 20030130393Abstract: An aqueous dispersion composition of about 30 to about 70 weight % non-melt-processible fluoropolymer particles having a standard specific gravity (SSG) of less than 2.Type: ApplicationFiled: March 13, 2002Publication date: July 10, 2003Inventors: Robert John Cavanaugh, Clay Woodward Jones, Kazuo Konabe, Daniel N. Levy, Philippe Andre Fernand Thomas, Theodore A. Treat
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Patent number: 6528574Abstract: This invention relates to an aqueous dispersion of (a) from 0.5 to 99.5 weight percent of a fluoropolymer having an average particle size of from 0.01 to 30 microns; and (b) from 0.5 to 99.5 weight percent of an ethylene copolymer which comprises at least 50% by weight ethylene, 1-35% by weight of an acid-containing unsaturated mono-carboxylic acid, and optionally 0-49% by weight of a moiety selected from at least one of alkyl acrylate, alkyl methacrylate, vinyl ether, carbon monoxide and sulfur dioxide, and further wherein the acid groups are neutralized from 0-100% by a metal ion or other cations, the weight percents being based on the total amounts of (a) and (b) only. The invention also relates to a coprecipate of this aqueous dispersion and a dry powder made by drying the aqueous dispersion or coprecipitate.Type: GrantFiled: March 11, 1999Date of Patent: March 4, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Daniel N. Levy, Eleni Karayianni
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Patent number: 6506043Abstract: An extrusion head for use in the paste extrusion of lubricated PTFE fine powder, the extrusion head comprising an external die having an inlet, a chamber, and an outlet, a tip positioned in the chamber of the die, the tip having a circumferential ridge formed therein that extends into the chamber, the chamber having a shape complementary to the ridge so as to form a space between the external die and the tip to allow lubricated PTFE fine powder to pass therethrough, and a mandrel which extends through the external die and supports the tip in the chamber.Type: GrantFiled: November 13, 2000Date of Patent: January 14, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Daniel N. Levy, Fabrice Aubertin
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Patent number: 6174473Abstract: The present invention relates to a process of paste extruding lubricated PTFE fine powder in an extrusion device by forcing the lubricated PTFE fine powder through the extrusion device and out of an orifice as a lubricated green extrudate, wherein before exiting through the orifice, the direction of the flow of the lubricated PTFE fine powder in the extrusion device is reoriented in a direction at least 60 degrees different from the initial direction of the flow of the lubricated PTFE fine powder through the extrusion device.Type: GrantFiled: July 27, 1998Date of Patent: January 16, 2001Assignee: E.I. du Pont de Nemours and CompanyInventors: Daniel N. Levy, Fabrice Aubertin
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Patent number: 5965074Abstract: Paste extrusion of lubricated PTFE fine powder is carried out by using the extrusion head of the extruder as the ram for forcing the powder through the extrusion orifice in the extrusion head, i.e. the extrusion head is moved against the powder, whether in particle form or preform form, to cause the extrusion.Type: GrantFiled: February 12, 1998Date of Patent: October 12, 1999Assignee: E.I. du Pont de Nemours and CompanyInventors: Fabrice Aubertin, Daniel N. Levy