Patents by Inventor Tapan Chakrabarty

Tapan Chakrabarty 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).

  • Patent number: 6677388
    Abstract: Wax in water emulsions prepared from Fischer-Tropsch derived waxes, Fischer-Tropsch process water, and two alkyl ethoxylated phenol nonionic surfactants having different hydrophilic-lipophilic balances provide high performance pipeline transport of waxes with reduced pipeline fouling.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: January 13, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Tapan Chakrabarty, Robert Jay Wittenbrink, Paul Joseph Berlowitz, Loren Leon Ansell
  • Publication number: 20030163946
    Abstract: Emulsions of a hydrocarbon and water in which the hydrocarbon preferably is a Fischer-Tropsch derived hydrocarbon fuel and in which emulsion a major portion of the hydrocarbon has particle sizes of 1 micron or less produce reduced particulate matter emissions upon combustion.
    Type: Application
    Filed: March 1, 2002
    Publication date: September 4, 2003
    Inventors: Paul Joseph Berlowitz, Robert Jay Wittenbrink, Tapan Chakrabarty
  • Publication number: 20020077370
    Abstract: Wax in water emulsions prepared from waxes, Fischer-Tropsch water and two surfactants provide high performance pipeline transport of waxes with reduced pipeline fouling.
    Type: Application
    Filed: July 20, 2001
    Publication date: June 20, 2002
    Inventors: Tapan Chakrabarty, Robert Jay Wittenbrink, Paul Joseph Berlowitz, Loren Leon Ansell
  • Patent number: 6355159
    Abstract: A heavy hydrocarbon is rendered pipelineable by hydroconverting the heavy hydrocarbon under conditions sufficient to obtain a product oil of lowered viscosity and an API gravity suitable for pipelining and thereafter adding a diluent modified hydrocarbon to the product oil in an amount sufficient to stabilize the product oil against asphaltene phase separation and when phase separated asphaltene is present to dissolve the phase separated asphaltenes.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: March 12, 2002
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ronald Damian Myers, Mainak Ghosh, Michelle A. Young, Tapan Chakrabarty, Bruce M. Sankey, Irwin Andrew Wiehe
  • Patent number: 6284806
    Abstract: Hydrocarbon in water emulsions comprising Fischer-Tropsch process water, at least 20 to about 90 weight percent of a Fischer-Tropsch wax, a first nonionic surfactant having an HLB of at least 11 and a second nonionic surfactant having an HLB less than 11. Said emulsions are liquid at room temperature and pour by ordinary gravity. Also disclosed are methods of making said hydrocarbon in water emulsions.
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: September 4, 2001
    Assignee: Exxon Research and Engineering Company
    Inventors: Tapan Chakrabarty, Robert J. Wittenbrink, Paul J. Berlowitz, Loren L. Ansell
  • Patent number: 6277269
    Abstract: A bitumen is rendered pipelineable by partially hydroconverting the bitumen and then adding sufficient diluent to the partially hydroconverted bitumen to provide a mixture having an API gravity at 15° C. of at least 19° and a viscosity at 40° C. in the range of about 35 to about 60 cP.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: August 21, 2001
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Ronald Damian Myers, John Brenton MacLeod, Mainak Ghosh, Tapan Chakrabarty
  • Patent number: 6096192
    Abstract: A bitumen is rendered pipelineable by partially hydroconverting the bitumen and then adding sufficient diluent to the partially hydroconverted bitumen to provide a mixture having an API gravity at 15.degree. C. of at least 19.degree. and a viscosity at 40.degree. C. in the range of about 35 to about 60 cP.
    Type: Grant
    Filed: July 14, 1998
    Date of Patent: August 1, 2000
    Assignee: Exxon Research and Engineering Co.
    Inventors: Ronald Damian Myers, John Brenton MacLeod, Mainak Ghosh, Tapan Chakrabarty
  • Patent number: 4623022
    Abstract: A method for producing hydrocarbons from a subterranean formation which reduces sand packing in a producing well completed in a zone adjacent the hydrocarbon-bearing formation. The method includes the steps of producing a fluid from the formation which contains both a hydrocarbon phase and an aqueous phase, and simultaneously therewith, injecting a sand control agent, such as a quarternized acylated condensed alkanolamine, into the well adjacent the production zone at a rate to obtain a wellhead concentration of the agent in the aqueous phase in the produced fluid effective to flocculate the concomitantly produced sand particles. The sand particles so treated have a reduced tendency to pack in the well bore and are safely produced with the formation fluids. The method may be practiced in conjunction with conventional sand control techniques, or may be employed as the sole means of sand control.
    Type: Grant
    Filed: December 6, 1984
    Date of Patent: November 18, 1986
    Assignee: Exxon Production Research Co.
    Inventors: Tapan Chakrabarty, Ray Thomas