Patents by Inventor Ravi B. Shankar

Ravi B. Shankar 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).

  • Publication number: 20130260229
    Abstract: Battery electrolyte solutions contain certain ester solvents, a lithium salt and vinylene carbonate, vinyl ethylene carbonate or fluoroethylene carbonate. Batteries containing these solvents have excellent specific discharge capacities and reduced weight compared to batteries in which the electrolyte is based on ethylene carbonate.
    Type: Application
    Filed: December 13, 2011
    Publication date: October 3, 2013
    Applicant: Dow Global Technologies LLC
    Inventors: Oktay Uzun, Dean M. Welsh, David R. Wilson, Ravi B. Shankar, David J. Brennan
  • Publication number: 20120315549
    Abstract: A battery electrolyte solution contains from 0.001 to 20% by weight of certain phosphorus-sulfur compounds. The phosphorus-sulfur compound performs effectively as a solid-electrolyte interphase (SEI) forming material. The phosphorus-sulfur compound has little adverse impact on the electrical properties of the battery, and in some cases actually improves battery performance. Batteries containing the electrolyte solution form robust and stable SEIs even when charged at high rates during initial formation cycles.
    Type: Application
    Filed: November 16, 2009
    Publication date: December 13, 2012
    Inventors: Houxiang Tang, William J. Kruper, JR., Ravi B. Shankar, Deidre A. Strand, Peter M. Margl, Andrew J. Pasztor, JR., David R. Wilson, Jerey R. Stajdi
  • Patent number: 8058332
    Abstract: Phosphorus-sulfur compounds have flame retardant activity in organic polymer systems. The phosphorus-sulfur compounds can be represented by the structure: wherein X is oxygen or sulfur, T is a covalent bond, oxygen, sulfur or nitrogen, provided that at least one of X and T is sulfur, each X? is independently oxygen or sulfur, each m is independently zero or 1 when X? is oxygen and zero, 1 or 2 when X? is sulfur, n is at least 1 and preferably at least 2, each R is independently an unsubstituted or inertly substituted hydrocarbyl group or the R groups together form an unsubstituted or inertly substituted divalent organic group and A is an organic linking group.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: November 15, 2011
    Assignee: Dow Global Technologies LLC
    Inventors: Ravi B. Shankar, David R. Wilson, William J. Kruper, Bruce A. King, Michelle L. Hudack, Chun Wang, Ted A. Morgan, Inken Beulich, Daniel J. Murray, William Gerald Stobby, Mark W. Beach, Ing Feng Hu
  • Publication number: 20110250503
    Abstract: A battery electrolyte solution contains from 0.01 to 80% by weight of an aromatic phosphorus compound. The aromatic phosphorus compound provides increased thermal stability for the electrolyte, helping to reduce thermal degradation, thermal runaway reactions and the possibility of burning. The aromatic phosphorus compound has little adverse impact on the electrical properties of the battery, and in some cases actually improves battery performance.
    Type: Application
    Filed: November 16, 2009
    Publication date: October 13, 2011
    Inventors: David R. Wilson, Ravi B. Shankar, Houxiang Tang, Andrew J. Pasztor, JR., Peter M. Margl, William J. Kruper, JR., Mark D. Newsham, Jing Jin, Matthew M. Yonkey, Deidre A. Strand, Thomas D. Gregory, Jamie L. Cohen, Jeremy R. Stajdl
  • Publication number: 20110152391
    Abstract: Expanded styrenic polymers contain 1 to 20% by weight of one or more aromatic polyphosphonate compounds corresponding to the following structure I: wherein a and b are each from 0 to 6, with a+b being from 2 to 6, each R is independently hydrogen, unsubstituted or inertly substituted alkyl having up to 6 carbon atoms, —NO2, —NR12, —C?N, —OR1, —C(O)OR1, or —C(O)NR12 (wherein R1 is hydrocarbyl or hydrogen), each R2 is independently hydrogen, alkyl or inertly substituted alkyl, each R3 is a covalent bond or a divalent linking group, and each R4 is independently an alkyl, aryl, inertly substituted alkyl or inertly substituted aryl group. The aromatic polyphosphonate compounds are effective FR additives for the expanded polymers.
    Type: Application
    Filed: September 3, 2008
    Publication date: June 23, 2011
    Inventors: David R. Wilson, Duane R. Romer, William J. Kruper, JR., Ravi B. Shankar, William G. Stobby, Anteneh Z. Worku
  • Publication number: 20110034573
    Abstract: Phosphorus-sulfur compounds have flame retardant activity in organic polymer systems. The phosphorus-sulfur compounds can be represented by the structure: wherein X is oxygen or sulfur, T is a covalent bond, oxygen, sulfur or nitrogen, provided that at least one of X and T is sulfur, each X? is independently oxygen or sulfur, each m is independently zero or 1 when X? is oxygen and zero, 1 or 2 when X? is sulfur, n is at least 1 and preferably at least 2, each R is independently an unsubstituted or inertly substituted hydrocarbyl group or the R groups together form an unsubstituted or inertly substituted divalent organic group and A is an organic linking group.
    Type: Application
    Filed: October 18, 2010
    Publication date: February 10, 2011
    Inventors: Ravi B. Shankar, David R. Wilson, William J. Kruper, Bruce A. King, Michelle L. Hudack, Chun Wang, Ted A. Morgan, Inken Beulich, Daniel J. Murray, William Gerald Stobby, Mark W. Beach, Ing Feng Hu
  • Publication number: 20100298475
    Abstract: The present invention relates to flame resistance additives for organic polymers, and in particular polyphosphonate-type flame resistance additives in a polycarbonate or a polyester carbonate and/or in blends of polycarbonate or a polyester carbonate with an acrylonitrile, butadiene, and styrene terpolymer. The aromatic polyphosphonate compounds of the present invention are represented by the structure, wherein a and b are each from 0 to 6, with a+b being from 2 to 6, each R is independently hydrogen, unsubstituted or inertly substituted alkyl having up to 6 carbon atoms, —NO2, —NR12, —C?N, —OR1, —C(O)OR1, or —C(O)NR12 (wherein R1 is hydrocarbyl or hydrogen), each R2 is independently hydrogen, alkyl or inertly substituted alkyl, each R3 is a covalent bond or a divalent linking group, and each R4 is independently an alkyl, aryl, inertly substituted alkyl or inertly substituted aryl group.
    Type: Application
    Filed: January 8, 2009
    Publication date: November 25, 2010
    Inventors: David R. Wilson, Ravi B. Shankar, Ashwin R. Bharadwaj, Bruce A. King
  • Publication number: 20080153950
    Abstract: Phosphorus-sulfur compounds have flame retardant activity in organic polymer systems. The phosphorus-sulfur compounds can be represented by the structure: wherein X is oxygen or sulfur, T is a covalent bond, oxygen, sulfur or nitrogen, provided that at least one of X and T is sulfur, each X? is independently oxygen or sulfur, each m is independently zero or 1 when X? is oxygen and zero, 1 or 2 when X? is sulfur, n is at least 1 and preferably at least 2, each R is independently an unsubstituted or inertly substituted hydrocarbyl group or the R groups together form an unsubstituted or inertly substituted divalent organic group and A is an organic linking group.
    Type: Application
    Filed: December 20, 2007
    Publication date: June 26, 2008
    Inventors: Ravi B. Shankar, William J. Kruper, David R. Wilson, Bruce A. King, Michelle L. Hudack, Daniel J. Murray, Chun Wang, William Gerald Stobby, Ted A. Morgan, Mark W. Beach, Inken Beulich, Ing Feng Hu
  • Patent number: 7012121
    Abstract: Supported catalyst compositions use for use in the gas-phase polymerization of one or more ?-olefins and methods for making and using the same, the catalyst composition including A) an inert support; B) a Group 4–10 metal complex corresponding to the formula: where M is a metal from one of Groups 4 to 10 of the Periodic Table of the Elements in the +2 or +4 formal oxidation state, Cp is a ?-bonded anionic ligand group, Z is divalent moiety bound to Cp and bound to M by either covalent or coordinate/covalent bonds and contains boron or a member of Group 14 of the Periodic Table of the Elements, and also nitrogen, phosphorus, sulfur or oxygen, and X is a neutral conjugated diene ligand group having up to 60 atoms, or a dianionic derivative thereof; and C) an ionic cocatalyst capable of converting the metal complex into an active polymerization catalyst represented by the formula: [L*-H]+[(C6F5)3BC6H4—O—MORCx-1Xay]?, wherein L* is a neutral Lewis base, Mo is a metal or metalloid selected from Groups 1–14 o
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: March 14, 2006
    Assignee: BP Chemicals Limited
    Inventors: Edmund M Carnahan, David R Neithamer, Ravi B Shankar
  • Patent number: 6946531
    Abstract: Low molecular weight olefin polymers are prepared by a polymerization process employing titanium complexes comprising a 3-aryl-substituted cyclopentadienyl ring or substituted derivatives thereof as polymerization catalysts.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: September 20, 2005
    Assignee: Dow Global Technologies Inc.
    Inventors: David D. Graf, Jerzy Klosin, Timothy A. Herzog, Peter N. Nickias, Carlos G. Ortiz, Jorge Soto, Ravi B. Shankar, Daniel D. VanderLende
  • Patent number: 6927264
    Abstract: A metal complex useful as a component of a catalyst composition for addition polymerizations comprising an anionic, polycyclic, fused ring ligand system containing at least 4 fused rings, at least one such ring comprising at least one heteroatom, said ligand being bonded to M by means of delocalized ?-electrons and an addition polymerization process using the same.
    Type: Grant
    Filed: May 27, 2004
    Date of Patent: August 9, 2005
    Assignee: Dow Global Technologies Inc.
    Inventors: Shaoguang Feng, Ravi B. Shankar, Francis J. Timmers
  • Publication number: 20040249092
    Abstract: A metal complex useful as a component of a catalyst composition for addition polymerizations comprising an anionic, polycyclic, fused ring ligand system containing at least 4 fused rings, at least one such ring comprising at least one heteroatom, said ligand being bonded to M by means of delocalized &pgr;-electrons and an addition polymerization process using the same.
    Type: Application
    Filed: May 27, 2004
    Publication date: December 9, 2004
    Inventors: Shaoguang Feng, Ravi B. Shankar, Francis J. Timmers
  • Patent number: 6825147
    Abstract: Titanium complexes comprising a 3-aryl-substituted cyclopentadienyl ring or substituted derivative thereof and at least one additional aryl substituent on the cyclopentadienyl ring, polymerization catalysts, and olefin polymerization processes using the same are disclosed.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: November 30, 2004
    Assignee: Dow Global Technologies Inc.
    Inventors: Jerzy Klosin, Ravi B. Shankar, Shaoguang S. Feng, Francis J. Timmers
  • Publication number: 20040235646
    Abstract: The invention provides supported catalyst and methods for making and using the same, which are characterized as employing organometallic Group 4-10 catalysts with specially selected dienes, which, when combined with a cocatalyst, result in a supported catast which has improved kinetic profiles in the gas polymerization process.
    Type: Application
    Filed: July 1, 2004
    Publication date: November 25, 2004
    Applicant: BP Chemical Limited
    Inventors: Edmund M. Carnahan, David R. Neithamer, Ravi B. Shankar
  • Patent number: 6806327
    Abstract: Metal complexes comprising a polycyclic, fused ring ligand or inertly substituted derivative thereof comprising at least: (1) a cyclopentadienyl ring, (2) a 7 membered polyatomic ring, and (3) one or more aromatic ring systems, with the proviso that said 7 membered ring (2), is fused to both the cyclopentadienyl ring (1), and said one or more aromatic ring systems (3), and substituted in at least one ring position with a substituent group resulting in sp2 hybridization on the ring atom bonded thereto; polymerization catalysts; and olefin polymerization processes using the same are disclosed.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: October 19, 2004
    Assignee: Dow Global Technologies Inc.
    Inventors: Richard E. Campbell, Jr., Jerzy Klosin, Ravi B. Shankar, Francis J. Timmers, Robert K. Rosen, Shaoguang Feng
  • Patent number: 6800701
    Abstract: Compounds and metal complexes comprising a polycyclic, fused ring ligand or inertly substituted derivative thereof having up to 60 atoms other than hydrogen, said ligand comprising at least: (1) a cyclopentadienyl ring, (2) a 6, 7, or 8 membered ring other than a 6-carbon aromatic ring, and (3) an aromatic ring, with the proviso that said 6, 7, or 8 membered ring (2), is fused to both the cyclopentadienyl ring (1), and the aromatic ring (3), polymerization catalysts, a process to prepare the novel compounds and complexes, and olefin polymerization processes using the same are disclosed.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: October 5, 2004
    Assignee: Dow Global Technologies Inc.
    Inventors: Richard E. Campbell, Jr., Jerzy Klosin, Ravi B. Shankar, Francis J. Timmers, Robert K. Rosen
  • Publication number: 20040092680
    Abstract: Low molecular weight olefin polymers are prepared by a polymerization process employing titanium complexes comprising a 3-aryl-substituted cyclopentadienyl ring or substituted derivatives thereof as polymerization catalysts.
    Type: Application
    Filed: September 18, 2003
    Publication date: May 13, 2004
    Inventors: David D. Graf, Jerzy Klosin, Timothy A. Herzog, Peter N. Nickias, Carlos G. Ortiz, Jorge Soto, Ravi B. Shankar, Daniel D. VanderLende
  • Publication number: 20030216529
    Abstract: Compounds and metal complexes comprising a polycyclic, fused ring ligand or inertly substituted derivative thereof having up to 60 atoms other than hydrogen, said ligand comprising at least: (1) a cyclopentadienyl ring, (2) a 6, 7, or 8 membered ring other than a 6-carbon aromatic ring, and (3) an aromatic ring, with the proviso that said 6, 7, or 8 membered ring (2), is fused to both the cyclopentadienyl ring (1), and the aromatic ring (3), polymerization catalysts, a process to prepare the novel compounds and complexes, and olefin polymerization processes using the same are disclosed.
    Type: Application
    Filed: May 13, 2003
    Publication date: November 20, 2003
    Inventors: Richard E. Campbell, Jerzy Klosin, Ravi B. Shankar, Francis J. Timmers, Robert K. Rosen
  • Patent number: 6613921
    Abstract: Compounds and metal complexes comprising a polycyclic, fused ring ligand or inertly substituted derivative thereof having up to 60 atoms other than hydrogen, said ligand comprising at least: (1) a cyclopentadienyl ring, (2) a 6, 7, or 8 membered ring other than a 6-carbon aromatic ring, and (3) an aromatic ring, with the proviso that said 6, 7, or 8 membered ring (2), is fused to both the cyclopentadienyl ring (1), and the aromatic ring (3), polymerization catalysts, a process to prepare the novel compounds and complexes, and olefin polymerization processes using the same are disclosed.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: September 2, 2003
    Assignee: Dow Global Technologies Inc.
    Inventors: Richard E. Campbell, Jr., Jerzy Klosin, Ravi B. Shankar, Francis J. Timmers, Robert K. Rosen
  • Publication number: 20020183464
    Abstract: Titanium complexes comprising a 3-aryl-substituted cyclopentadienyl ring or substituted derivative thereof, polymerization catalysts, and olefin polymerization processes using the same are disclosed.
    Type: Application
    Filed: April 15, 2002
    Publication date: December 5, 2002
    Inventors: Jerzy Klosin, Ravi B. Shankar, Shaoguang S. Feng, Francis J. Timmers