Patents by Inventor Sandeep S. Dhingra

Sandeep S. Dhingra 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: 8288311
    Abstract: A process and catalyst for the hydro-oxidation of an olefin having three or more carbon atoms, such as propylene, to form an olefin oxide, such as propylene oxide. The process involves contacting the olefin with oxygen in the presence of hydrogen and a hydro-oxidation catalyst under reaction conditions; the catalyst comprising gold nanoparticles deposited on a nanoporous titanium-containing support, prepared by depositing a gold-ligand cluster complex onto the support to form a catalyst precursor, and then heating and/or chemically treating the catalyst precursor to form the hydro-oxidation catalyst composition. The hydro-oxidation catalyst exhibits stabilized catalyst activity, enhanced lifetime, and improved hydrogen efficiency.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: October 16, 2012
    Inventors: Sandeep S. Dhingra, Rick C. Schroden, Keith J. Watson, David G. Barton, Robert G. Bowman, Larry N. Ito, David L. Trent, Heiko Weiner
  • Publication number: 20100076208
    Abstract: A process and catalyst for the hydro-oxidation of an olefin having three or more carbon atoms, such as propylene, to form an olefin oxide, such as propylene oxide. The process involves contacting the olefin with oxygen in the presence of hydrogen and a hydro-oxidation catalyst under reaction conditions; the catalyst comprising gold nanoparticles deposited on a nanoporous titanium-containing support, prepared by depositing a gold-ligand cluster complex onto the support to form a catalyst precursor, and then heating and/or chemically treating the catalyst precursor to form the hydro-oxidation catalyst composition. The hydro-oxidation catalyst exhibits stabilized catalyst activity, enhanced lifetime, and improved hydrogen efficiency.
    Type: Application
    Filed: November 7, 2007
    Publication date: March 25, 2010
    Inventors: Sandeep S. Dhingra, Rick C. Schroden, Keith J. Watson, David G. Barton, Robert G. Bowman, Larry N. Ito, David L. Trent, Heiko Weiner
  • Patent number: 7645717
    Abstract: Nano-scale DMC catalyst complexes are highly active alkylene oxide polymerization catalysts. Thy show a greatly improved ability to catalyze the formation of EO-capping onto secondary hydroxyl-terminated polyethers. The catalysts can be prepared by precipitation in the dispersed adequous phase of a water-in-oil emulsion.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: January 12, 2010
    Assignee: Dow Global Technologies, Inc.
    Inventors: Sandeep S. Dhingra, Karla F. Mabe, Keith Jeffrey Watson
  • Patent number: 6787124
    Abstract: A new synthetic porous crystalline material, designated EMM-1, is disclosed having, in its calcined form, the X-ray diffraction pattern of Table 2 above. Also disclosed are methods of making EMM-1 in the presence of HF using various organic nitrogen compounds as directing agents. Aluminum-containing EMM-1 can be produced either by inclusion of Al in the synthesis, or by incorporation of B or Ga in the synthesis, followed by post treatment with aluminum nitrate or other sources of Al. EMM-1 is useful as an acid catalyst and as an adsorbent.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: September 7, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Arthur W. Chester, Sandeep S. Dhingra, Stephen G. Casmer
  • Patent number: 6676922
    Abstract: This invention relates to a new synthetic porous crystalline material, designated MCM-71, a method for its preparation and its use in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern and has a unique 3-dimensional channel system comprising generally straight, highly elliptical channels, each of which is defined by 10-membered rings of tetrahedrally coordinated atoms, intersecting with sinusoidal channels, each of which is defined by 8-membered rings of tetrahedrally coordinated atoms.
    Type: Grant
    Filed: May 1, 2002
    Date of Patent: January 13, 2004
    Assignee: ExxonMobil Oil Corporation
    Inventor: Sandeep S. Dhingra
  • Patent number: 6656268
    Abstract: This invention relates to a new synthetic porous crystalline material, designated MCM-70, having, in its calcined form, the x-ray diffraction pattern of Table 1 above. The invention further resides in a method for preparing MCM-70 in borosilicate and in the conversion of organic compounds contacted with an active form of MCM-70.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: December 2, 2003
    Assignee: ExxonMobil Oil Corporation
    Inventors: Sandeep S. Dhingra, Simon C. Weston
  • Publication number: 20030185751
    Abstract: A new synthetic porous crystalline material, designated EMM-1, is disclosed having, in its calcined form, the X-ray diffraction pattern of Table 2 above. Also disclosed are methods of making EMM-1 in the presence of HF using various organic nitrogen compounds as directing agents. Aluminum-containing EMM-1 can be produced either by inclusion of Al in the synthesis, or by incorporation of B or Ga in the synthesis, followed by post treatment with aluminum nitrate or other sources of Al. EMM-1 is useful as an acid catalyst and as an adsorbent.
    Type: Application
    Filed: February 14, 2003
    Publication date: October 2, 2003
    Inventors: Arthur W. Chester, Sandeep S. Dhingra, Stephen G. Casmer
  • Patent number: 6548709
    Abstract: The present invention relates to methods for production of arylsulfides wherein an aromatic compound is reacted with elemental sulfur in the presence of solid acid catalyst. The solid acid catalyst can be a zeolite. The methods are useful for producing alkylated diphenylsulfides from aromatic compounds and elemental sulfur.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: April 15, 2003
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Margaret M. Wu, Philip Trotto, Shifang Luo, Jose G. Santiesteban, Hye Kyung C. Timken, Sandeep S. Dhingra, Simon C. Weston, Richard T. Spissell
  • Patent number: 6524551
    Abstract: This invention provides a process for the synthesis of MCM-58 using 1-(1-adamantyl)pyridinium cations as a directing agent. The resultant MCM-58 is useful in a variety of hydrocarbon conversion reactions including toluene disproportionation, transalkylation of aromatics, reaction of paraffins with aromatics, paraffin isomerization and alkylation of aromatics with olefins.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: February 25, 2003
    Assignee: ExxonMobil Oil Corporation
    Inventor: Sandeep S. Dhingra
  • Publication number: 20030012729
    Abstract: This invention relates to a new synthetic porous crystalline material, designated MCM-71, a method for its preparation and its use in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern and has a unique 3-dimensional channel system comprising generally straight, highly elliptical channels, each of which is defined by 10-membered rings of tetrahedrally coordinated atoms, intersecting with sinusoidal channels, each of which is defined by 8-membered rings of tetrahedrally coordinated atoms.
    Type: Application
    Filed: May 1, 2002
    Publication date: January 16, 2003
    Inventor: Sandeep S. Dhingra
  • Publication number: 20020174824
    Abstract: This invention relates to a new synthetic porous crystalline material, designated MCM-70, having, in its calcined form, the X-ray diffraction pattern of Table I above.
    Type: Application
    Filed: January 25, 2002
    Publication date: November 28, 2002
    Inventors: Sandeep S. Dhingra, Simon C. Weston
  • Publication number: 20020164284
    Abstract: This invention provides a process for the synthesis of MCM-58 using 1-(1-adamantyl) pyridinium cations as a directing agent.
    Type: Application
    Filed: January 25, 2002
    Publication date: November 7, 2002
    Inventor: Sandeep S. Dhingra
  • Publication number: 20020137971
    Abstract: The present invention relates to methods for production of arylsulfides wherein an aromatic compound is reacted with elemental sulfur in the presence of solid acid catalyst. The solid acid catalyst can be a zeolite. The methods are useful for producing alkylated diphenylsulfides from aromatic compounds and elemental sulfur.
    Type: Application
    Filed: October 9, 2001
    Publication date: September 26, 2002
    Inventors: Margaret M. Wu, Philip Trotto, Shifang Luo, Jose G. Santiesteban, Hye Kyung C. Timken, Sandeep S. Dhingra, Simon C. Weston, Richard T. Spissell
  • Patent number: 6310265
    Abstract: This invention relates to a process for isomerizing paraffins comprising the step of contacting a feed containing paraffins with a catalyst comprising a synthetic porous crystalline material, designated MCM-68, which exhibits a distinctive X-ray diffraction pattern and has a unique crystal structure which contains at least one channel system, in which each channel is defined by a 12-membered ring of tetrahedrally coordinated atoms, and at least two further, independent channel systems, in each of which each channel is defined by a 10-membered ring of tetrahedrally coordinated atoms, wherein the number of unique 10-membered ring channels is twice the number of 12-membered ring channels.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: October 30, 2001
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Arthur W. Chester, David C. Calabro, Sandeep S. Dhingra, Jean W. Beeckman, Timothy J. Fiebig, Glenn R. Sweeten, Terry E. Helton, Charles T. Kresge, Richard F. Socha, Simon C. Weston
  • Patent number: 6063262
    Abstract: This invention relates to a new synthetic porous crystalline material, designated MCM-67, a method for its preparation and use thereof in catalytic conversion of organic compounds. MCM-67 appears to be closely related in structure to VPI-8 and SSZ-41 but is synthesized without zinc and in the presence of manganese and/or cobalt ions.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: May 16, 2000
    Assignee: Mobil Oil Corporation
    Inventors: Sandeep S. Dhingra, Charles T. Kresge, Robin P. Ziebarth
  • Patent number: 6054052
    Abstract: Incorporation of zirconium, nickel and/or copper into M41S results in selective sorption of bulky organic molecules. Zirconium, nickel and/or copper may be incorporated into M41S by exchange or impregnation.
    Type: Grant
    Filed: December 14, 1995
    Date of Patent: April 25, 2000
    Assignee: Mobil Oil Corporation
    Inventors: Sandeep S. Dhingra, Charles T. Kresge, Sharon B. McCullen
  • Patent number: 6049018
    Abstract: This invention relates to a new synthetic porous crystalline material, designated MCM-68, a method and novel polycyclic organic cation for its preparation and its use in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern and has a unique crystal structure which contains at least one channel system, in which each channel is defined by a 12-membered ring of tetrahedrally coordinated atoms, and at least two further, independent channel systems, in each of which each channel is defined by a 10-membered ring of tetrahedrally coordinated atoms, wherein the number of unique 10-membered ring channels is twice the number of 12-membered ring channels.
    Type: Grant
    Filed: January 21, 1999
    Date of Patent: April 11, 2000
    Assignee: Mobil Corporation
    Inventors: David C. Calabro, Jane C. Cheng, Robert A. Crane, Jr., Charles T. Kresge, Sandeep S. Dhingra, Michael A. Steckel, David L. Stern, Simon C. Weston
  • Patent number: 5705695
    Abstract: The quaternary Zintl material (Et.sub.4 N).sub.4 ?Au(Ag.sub.1-x Au.sub.x).sub.2 Sn.sub.2 Te.sub.9 ! that contains 1-D semiconducting chains composed of four metallic elements is prepared by treating ethylenediamine extracts of a pentanary K--Au--Ag--Sn--Te alloy with Et.sub.4 NI.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: January 6, 1998
    Assignee: NEC Research Institute, Inc.
    Inventors: Robert C. Haushalter, Sandeep S. Dhingra