Patents by Inventor Sundar Kilnagar Venkataraman
Sundar Kilnagar Venkataraman 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: 20170025204Abstract: A USB cable for transmitting data at superspeed at a frequency of at least 10 GHz is provided, comprising a jacket, and positioned within said jacket at least a power cable and a plurality of shielded insulated conductors for transmitting said data at speeds up to 10 Gbps per channel, the insulation of said insulated conductors exhibiting a dissipation factor of no greater than 0.00035 at 10 GHz, and comprising melt-fabricable perfluoropolymer, such as tetrafluoroethylene/hexafluoropropylene copolymer or tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.Type: ApplicationFiled: July 7, 2016Publication date: January 26, 2017Inventors: GREGORY ALLEN CHAPMAN, SUNDAR KILNAGAR VENKATARAMAN, XIANJIANG XIAO, ROBERT THOMAS YOUNG, LEIMING ZHANG
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Publication number: 20150175757Abstract: The present invention provides oriented film comprising the composition 55 to 95 wt % tetrafluoroethylene/hexafluoropropylene/-perfluoro(alkyl vinyl ether) copolymer and 45 to 5 wt % tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer to total 100 wt % based on the combined weight of said copolymers, wherein the alkyl in each copolymer comprises 1 to 4 carbon atoms and wherein the presence of the tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer in the composition and the presence of perfluoro(alkyl vinyl ether) in both copolymers improves the thermoformability of the film as compared to oriented film of the same film thickness comprising the tetrafluoroethylene/hexafluoropropylene/perfluoro-(alkyl vinyl ether) copolymer by itself.Type: ApplicationFiled: December 16, 2014Publication date: June 25, 2015Inventors: RALPH MUNSON ATEN, HEIDI ELIZABETH BURCH, SUNDAR KILNAGAR VENKATARAMAN, ROBERT THOMAS YOUNG
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Patent number: 8404756Abstract: A foamable fluoropolymer composition containing foam cell nucleating agent is provided, wherein the fluoropolymer comprises melt-fabricable tetrafluoroethylene-/hexafluoropropylene copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein the alkyl contains 1 to 4 carbon atoms, wherein the melting temperature of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer is no more than 35° C. greater than the melting temperature of said tetrafluoroethylene/hexafluoropropylene copolymer, and/or wherein said tetrafluoroethylene/hexafluoropropylene copolymer and said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer each have a melt flow rate (MFR) within the range of 1 to 40 g/10 min and the MFR of one of said copolymers is at least twice that of the other of said copolymers.Type: GrantFiled: April 13, 2012Date of Patent: March 26, 2013Assignee: E. I. du Pont de Nemours and CompanyInventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Robert Thomas Young
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Patent number: 8354461Abstract: The present invention discloses a foamable composition. The foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The foamable composition has a uniform foam cell size where the foam cell size of at least 90% of the foamed cells is 50 micrometers or less. The foam nucleating package ranges from 0.1 to 10 wt % of the combined weight of the perfluoropolymer and the foam nucleating package.Type: GrantFiled: March 24, 2009Date of Patent: January 15, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Sundar Kilnagar Venkataraman, Robert Thomas Young
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Publication number: 20120199377Abstract: A foamable fluoropolymer composition containing foam cell nucleating agent is provided, wherein the fluoropolymer comprises melt-fabricable tetrafluoroethylene-/hexafluoropropylene copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein the alkyl contains 1 to 4 carbon atoms, wherein the melting temperature of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer is no more than 35° C. greater than the melting temperature of said tetrafluoroethylene/hexafluoropropylene copolymer, and/or wherein said tetrafluoroethylene/hexafluoropropylene copolymer and said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer each have a melt flow rate (MFR) within the range of 1 to 40 g/10 min and the MFR of one of said copolymers is at least twice that of the other of said copolymers.Type: ApplicationFiled: April 13, 2012Publication date: August 9, 2012Applicant: E. I. DU PONT DE NEMOURS AND .COMPANYInventors: HEIDI ELIZABETH BURCH, SUNDAR KILNAGAR VENKATARAMAN, ROBERT THOMAS YOUNG
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Patent number: 8236898Abstract: A melt-mixed composition of non-melt flowable polytetrafluoroethylene (PTFE) and melt-fabricable perfluoropolymer is provided that exhibits thixotropy at increasing shear rate in the molten state and high elongation at break even at PTFE concentrations well above 4 wt %, based on the combined weight of the PTFE and the perfluoropolymer, e.g. at least 200% up to at least 30 wt % PTFE, the composition also exhibiting the structure of a dispersion of submicrometer-size particles of the PTFE in a continuous phase of the melt-fabricable perfluoropolymer.Type: GrantFiled: September 22, 2011Date of Patent: August 7, 2012Assignee: E I du Pont de Nemours and CompanyInventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Ralph Munson Aten
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Publication number: 20120172466Abstract: A process for making an extruded foamable composition is disclosed where the foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The process makes a foamed product having uniform foam cell size at high speeds without loss of product quality.Type: ApplicationFiled: March 9, 2012Publication date: July 5, 2012Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Sundar Kilnagar Venkataraman, Robert Thomas Young
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Patent number: 8178592Abstract: A foamable fluoropolymer composition containing foam cell nucleating agent is provided, wherein the fluoropolymer comprises melt-fabricable tetrafluoroethylene-/hexafluoropropylene copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein the alkyl contains 1 to 4 carbon atoms, wherein the melting temperature of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer is no more than 35° C. greater than the melting temperature of said tetrafluoroethylene/hexafluoropropylene copolymer, and/or wherein said tetrafluoroethylene/hexafluoropropylene copolymer and said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer each have a melt flow rate (MFR) within the range of 1 to 40 g/10 min and the MFR of one of said copolymers is at least twice that of the other of said copolymers.Type: GrantFiled: May 7, 2010Date of Patent: May 15, 2012Assignee: E.I. du Pont de Nemours and CompanyInventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Robert Thomas Young
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Patent number: 8153701Abstract: A process for making an extruded foamable composition is disclosed where the foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The process makes a foamed product having uniform foam cell size at high speeds without loss of product quality.Type: GrantFiled: March 31, 2010Date of Patent: April 10, 2012Assignee: E. I. du Pont de Nemours and CompanyInventors: Sundar Kilnagar Venkataraman, Robert Thomas Young
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Publication number: 20120010368Abstract: A melt-mixed composition of non-melt flowable polytetrafluoroethylene (PTFE) and melt-fabricable perfluoropolymer is provided that exhibits thixotropy at increasing shear rate in the molten state and high elongation at break even at PTFE concentrations well above 4 wt %, based on the combined weight of the PTFE and the perfluoropolymer, e.g. at least 200% up to at least 30 wt % PTFE, the composition also exhibiting the structure of a dispersion of submicrometer-size particles of the PTFE in a continuous phase of the melt-fabricable perfluoropolymer.Type: ApplicationFiled: September 22, 2011Publication date: January 12, 2012Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Ralph Munson Aten
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Patent number: 8053527Abstract: A melt-mixed composition of non-melt flowable polytetrafluoroethylene (PTFE) and melt-fabricable perfluoropolymer is provided that exhibits thixotropy at increasing shear rate in the molten state and high elongation at break even at PTFE concentrations well above 4 wt %, based on the combined weight of the PTFE and the perfluoropolymer, e.g. at least 200% up to at least 30 wt % PTFE, the composition also exhibiting the structure of a dispersion of submicrometer-size particles of the PTFE in a continuous phase of the melt-fabricable perfluoropolymer.Type: GrantFiled: January 12, 2010Date of Patent: November 8, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Ralph Munson Aten
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Patent number: 7947775Abstract: Aqueous dispersions on non-melt flowable PTFE and melt-fabricable perfluoropolymer are mixed together, followed by recovery of the resultant mixture of the dispersed particles of each of these polymers, and melt mixing of the resultant mixture of particles to obtain a blend in which the PTFE particles form the disperse phase and the perfluoropolymer forms the continuous phase, the melt mixing producing advantageous melt viscosities and the blend exhibiting advantageous physical properties even at high PTFE contents of about 30 wt %.Type: GrantFiled: September 29, 2009Date of Patent: May 24, 2011Assignee: E.I. du Pont de Nemours and CompanyInventors: Sundar Kilnagar Venkataraman, Ralph Munson Aten, Heidi Elizabeth Burch
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Publication number: 20100326697Abstract: The present invention discloses an article made from a foamable thermoplastic polymer composition. The foamable composition of the article includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The foamable composition of the article has a uniform foam cell size where the foam cell size of at least 90% of the foamed cells is 50 micrometers or less. The foam nucleating package ranges from 0.1 to 10 wt % of the combined weight of the perfluoropolymer and the foam nucleating package.Type: ApplicationFiled: September 9, 2010Publication date: December 30, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: SUNDAR KILNAGAR VENKATARAMAN, ROBERT THOMAS YOUNG
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Publication number: 20100288533Abstract: A foamable fluoropolymer composition containing foam cell nucleating agent is provided, wherein the fluoropolymer comprises melt-fabricable tetrafluoroethylene-/hexafluoropropylene copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein the alkyl contains 1 to 4 carbon atoms, wherein the melting temperature of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer is no more than 35° C. greater than the melting temperature of said tetrafluoroethylene/hexafluoropropylene copolymer, and/or wherein said tetrafluoroethylene/hexafluoropropylene copolymer and said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer each have a melt flow rate (MFR) within the range of 1 to 40 g/10 min and the MFR of one of said copolymers is at least twice that of the other of said copolymers.Type: ApplicationFiled: May 7, 2010Publication date: November 18, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Robert Thomas Young
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Publication number: 20100190876Abstract: A process for making an extruded foamable composition is disclosed where the foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The process makes a foamed product having uniform foam cell size at high speeds without loss of product quality.Type: ApplicationFiled: March 31, 2010Publication date: July 29, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Sundar Kilnagar Venkataraman, Robert Thomas Young
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Patent number: 7763680Abstract: Core/shell polymer is provided wherein the core comprises non-melt flowable PTFE and the shell comprises melt-fabricable perfluoropolymer, the core/shell polymer providing a thixotropic melt blend and improved physical properties as compared to the melt-fabricable perfluoropolymer by itself.Type: GrantFiled: November 16, 2006Date of Patent: July 27, 2010Assignee: E.I. du Pont de Nemours and CompanyInventors: Ralph Munson Aten, Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman
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Patent number: 7744794Abstract: The present invention relates to the extrusion of a composition comprising tetrafluoroethylene/hexafluoropropylene copolymer, 10-60 wt % inorganic particulate filler, and hydrocarbon polymer for dispersing the filler in the copolymer, preferably 0.1 to 5 wt % hydrocarbon polymer, at low temperatures, e.g. up to 650° F. (343° C.).Type: GrantFiled: January 19, 2005Date of Patent: June 29, 2010Assignees: E. I. du Pont de Nemours and Company, AlphaGary CorporationInventors: Yevgeniy I. Globus, Mark A. Jozokos, John L. Netta, George Martin Pruce, Sundar Kilnagar Venkataraman
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Publication number: 20100113702Abstract: A melt-mixed composition of non-melt flowable polytetrafluoroethylene (PTFE) and melt-fabricable perfluoropolymer is provided that exhibits thixotropy at increasing shear rate in the molten state and high elongation at break even at PTFE concentrations well above 4 wt %, based on the combined weight of the PTFE and the perfluoropolymer, e.g. at least 200% up to at least 30 wt % PTFE, the composition also exhibiting the structure of a dispersion of submicrometer-size particles of the PTFE in a continuous phase of the melt-fabricable perfluoropolymer.Type: ApplicationFiled: January 12, 2010Publication date: May 6, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANY.Inventors: Heidi Elizabeth Burch, Sundar Kilnagar Venkataraman, Ralph Munson Aten
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Patent number: 7683130Abstract: The present invention relates to plenum cables jacketed with a composition comprising perfluoropolymer, inorganic char-forming agent, and fluoropolymer additive, which composition passes the NFPA-255 burn test.Type: GrantFiled: July 12, 2006Date of Patent: March 23, 2010Assignees: E.I. du Pont de Nemours and Company, Alphagary CorporationInventors: Yevgeniy I. Globus, Mark A. Jozokos, Sundar Kilnagar Venkataraman, Heidi Elizabeth Burch
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Publication number: 20100022713Abstract: Aqueous dispersions on non-melt flowable PTFE and melt-fabricable perfluoropolymer are mixed together, followed by recovery of the resultant mixture of the dispersed particles of each of these polymers, and melt mixing of the resultant mixture of particles to obtain a blend in which the PTFE particles form the disperse phase and the perfluoropolymer forms the continuous phase, the melt mixing producing advantageous melt viscosities and the blend exhibiting advantageous physical properties even at high PTFE contents of about 30 wt %.Type: ApplicationFiled: September 29, 2009Publication date: January 28, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: SUNDAR KILNAGAR VENKATARAMAN, RALPH MUNSON ATEN, HEIDI ELIZABETH BURCH