Patents Represented by Attorney Ramesh Varadaraj
  • Patent number: 7413584
    Abstract: The present invention relates to emulsion compositions for starting a reformer of a fuel cell system. In particular, the invention includes emulsion compositions comprising hydrocarbon fuel, water and alkoxylated alcohol surfactants for starting a reformer of a fuel cell system.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: August 19, 2008
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Paul Joseph Berlowitz
  • Patent number: 7323342
    Abstract: A method for determination for a given oil the relative stability of a water-in-oil emulsion that will be formed by that oil with water comprises measuring for the given oil the weight fraction of the oil that is most strongly adsorbed on a silica gel column successively eluted with n-hexane, toluene and methylene chloride-methanol mixture solvents and determining whether said weight fraction is greater than about 0.05; with a value above 0.05 being determinative of an emulsion more stable than one with a value less than 0.05.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: January 29, 2008
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Patent number: 7316724
    Abstract: A cermet composition represented by the formula (PQ)(RS)X comprising: a ceramic phase (PQ), a binder phase (RS) and X wherein X is at least one member selected from the group consisting of an oxide dispersoid E, an intermetallic compound F and a derivative compound G wherein said ceramic phase (PQ) is dispersed in the binder phase (RS) as particles of diameter in the range of about 0.5 to 3000 microns, and said X is dispersed in the binder phase (RS) as particles in the size range of about 1 nm to 400 nm.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: January 8, 2008
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Narasimha-Rao Venkata Bangaru, Jayoung Koo, ChangMin Chun, Hyun-Woo Jin, John Roger Peterson, Robert Lee Antram, Christopher John Fowler
  • Patent number: 7232470
    Abstract: The present invention is directed to oil-in-water-in-oil (O/W/O) emulsion compositions for starring a reformer or a fuel cell system. The oil-in-water-in-oil (O/W/O) emulsion compositions include hydrocarbon fuel, water, alkoxylated alkyl alcohol, alkoxylated alkyl ester and alkyl polyglycerol surfactants, and are used for starring a reformer of a fuel cell system.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: June 19, 2007
    Assignee: ExxonMobil Research and Enigeering Company
    Inventors: Ramesh Varadaraj, Paul J. Berlowitz
  • Patent number: 7175687
    Abstract: A cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and binder phase (RS) wherein, P is at least one metal selected from the group consisting of Group IV, Group V, Group VI elements, Q is boride, R is selected from the group consisting of Fe, Ni, Co, Mn and mixtures thereof, S comprises at least one element selected from Cr, Al, Si and Y.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: February 13, 2007
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Narasimha-Rao Venkata Bangaru, ChangMin Chun, Neeraj Srinivas Thirumalai, Hyun-Woo Jin, Jayoung Koo, John Roger Peterson, Robert Lee Antram, Christopher John Fowler
  • Patent number: 7175686
    Abstract: The invention includes a cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and a binder phase (RS) wherein, P is a metal selected from the group consisting of Si, Mn, Fe, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and mixtures thereof, Q is nitride, R is a metal selected from the group consisting of Fe, Ni, Co, Mn and mixtures thereof, S consists essentially of at least one element selected from Cr, Al, Si, and Y, and at least one reactive wetting aliovalent element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and mixtures thereof.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: February 13, 2007
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: ChangMin Chun, Narasimha-Rao Venkata Bangaru, Hyun-Woo Jin, Jayoung Koo, John Roger Peterson, Robert Lee Antram, Christopher John Fowler
  • Patent number: 7153338
    Abstract: One embodiment of the invention includes a cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and a binder phase (RS) wherein, P is a metal selected from the group consisting of Al, Si, Mg, Ca, Y, Fe, Mn, Group IV, Group V, Group VI elements, and mixtures thereof, Q is oxide, R is a base metal selected from the group consisting of Fe, Ni Co, Mn and mixtures thereof, S consists essentially of at least one element selected from Cr, Al and Si and at least one reactive wetting element selected from the group consisting of Ti, Zr, Hf, Ta, Sc, Y, La, and Ce.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: December 26, 2006
    Assignee: Exxonmobil Research and Engineering Company
    Inventors: Narasimha-Rao Venkata Bangaru, ChangMin Chun, Hyun-Woo Jin, Jayoung Koo, John Roger Peterson, Robert Lee Antram, Christopher John Fowler
  • Patent number: 7132180
    Abstract: The present invention relates to emulsion compositions for starting a reformer of a fuel cell system. In particular, the invention includes emulsion compositions comprising hydrocarbon fuel, water and alkyl sorbitan surfactants for starting a reformer of a fuel cell system.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: November 7, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Paul Joseph Berlowitz
  • Patent number: 7117722
    Abstract: Method to determine the viscosity of a water-in-oil emulsion that will be formed by an oil comprising organic acids when mixed with water comprising: determining the value of the expression: ? ( emul ) = K ? ? ? ( oil ) ? TAN - r ( 1 - ? ) 2.5 wherein ?(oil) is the viscosity the oil, TAN is the total acid number of the oil, ? is a number in the range of 0.1 to 0.8, r is a number in the range of about 0.5 to 2, and K is a number from about 1 to 20, said determined value, ?(emul) being the viscosity of the water-in-oil emulsion. The method is used to prepare water-in-oil emulsions of predetermined viscosity and to improve desalting of oils.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: October 10, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Patent number: 7108780
    Abstract: A method for determination for a given oil the relative stability of a water-in-oil emulsion that will be formed by that oil with water comprises measuring for the given oil the weight percent asphaltenes (A), total acid number (TAN), and ratio of the amount of naphthenic acids in the 450+ molecular weight to 450 molecular weight range (R); calculating an emulsion stability parameter, S=A+TAN*R; and determining whether the emulsion stability parameter, S, is greater than about 3; with a value above 3 being determinative of an emulsion more stable than one with a value less than 3.
    Type: Grant
    Filed: March 18, 2003
    Date of Patent: September 19, 2006
    Assignee: ExxonMobile Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Patent number: 7074253
    Abstract: Cermets are provided in which a substantially stoichiometric metal carbide ceramic phase along with a reprecipitated metal carbide phase, represented by the formula MxCy, is dispersed in a metal binder phase. In MxCy M is Cr, Fe, Ni, Co, Si, Ti, Zr, Hf, V, Nb, Ta, Mo or mixtures thereof, x and y are whole or fractional numerical values with x ranging from 1 to 30 and y from 1 to 6. These cermets are particularly useful in protecting surfaces from erosion and corrosion at high temperatures.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: July 11, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: ChangMin Chun, Narasimha-Rao Venkata Bangaru, Hyun-Woo Jin, Jayoung Koo, John Roger Peterson, Robert Lee Antram, Christopher John Fowler
  • Patent number: 7014773
    Abstract: The invention includes a method for demulsification of water-in-oil emulsions, oil-in-water emulsions, and mixtures of water-in-oil and oil-in-water emulsions by oscillatory mixing of the emulsions.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: March 21, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Patent number: 6876193
    Abstract: A method for deconvoluting a time dependent impedance spectrum and using the deconvoluted time dependent impedance spectrum as an indicator of the performance condition of a working fluid is disclosed. Also disclosed is a method to determine the viscosity ratio of a working fluid using the resistance ratio obtained from frequency dependent impedance data.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: April 5, 2005
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Alan M. Schilowitz, Walter D. Vann, Limin Song, John S. Szobota, Alexander Bolkhovsky
  • Patent number: 6869706
    Abstract: Emulsion compositions for starting a reformer of a fuel cell system comprises hyrdocarbon fuel, water and alkoxylated alkyl ester and alcohol surfactants.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: March 22, 2005
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Paul Joseph Berlowitz
  • Patent number: 6761818
    Abstract: The invention includes a compositon of matter comprising a heavy oil having dispersed therein surface modified solid wherein said surface modified solids comprise solids having adsorbed thereon air oxidized polar hydrocarbons from said heavy oil and wherein said surface modified solids have a diameter of about 10 microns or less and a method for preparing the same.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: July 13, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, James Chi Sung
  • Patent number: 6742603
    Abstract: A method and system is disclosed for extending the depth of a subterranean borehole that uses heated aqueous fluid to dissolve rock of the subterranean formation. The heated aqueous fluid comprises water and hydroxides of Group I elements of The Periodic Table of Elements and mixtures thereof. The drilling system comprises means for delivering aqueous fluid and heating the aqueous fluid prior to contacting rock of a subsurface formation.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: June 1, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Richard S. Polizzotti, Lee Hirsch, Amy B. Herhold, Mehmet D. Ertas
  • Patent number: 6736867
    Abstract: The present invention relates to emulsion compositions for starting a reformer of a fuel cell system. In particular, the invention includes emulsion compositions comprising hydrocarbon fuel, water and ethoxylated alkyl amine surfactants for starting a reformer of a fuel cell system.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 18, 2004
    Assignee: ExxonMobile Research and Engineering Company
    Inventors: Ramesh Varadaraj, Paul Joseph Berlowitz
  • Patent number: 6730138
    Abstract: The present invention relates to emulsion compositions for starting a reformer of a fuel cell system. In particular, the invention includes emulsion compositions comprising hydrocarbon fuel, water and alkyl polyglycerol surfactants for starting a reformer of a fuel cell system.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 4, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Paul Joseph Berlowitz
  • Patent number: 6716358
    Abstract: The invention includes a method for demulsification of water-in-oil emulsions.
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: April 6, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventor: Ramesh Varadaraj
  • Patent number: 6599949
    Abstract: The invention is directed towards a chemical demulsifier formulation comprising an alkyl aromatic sulfonic acid additive with at least 16 carbon atom alkyl group and at least two 6 carbon-ring aromatic group and a co-additive selected from the group consisting of dipropylene monobutyl ether, aromatic naphtha, isoparaffinic solvent, cycloparaffinic solvent, aromatic solvent, diethylene glycol monobutyl ether, benzyl alcohol and mixtures thereof and a process for demulsification and desalting crude oil using the demulsifier formulation.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: July 29, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ramesh Varadaraj, Cornelius Hendrick Brons