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).
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Patent number: 8288311Abstract: 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: GrantFiled: November 7, 2007Date of Patent: October 16, 2012Inventors: Sandeep S. Dhingra, Rick C. Schroden, Keith J. Watson, David G. Barton, Robert G. Bowman, Larry N. Ito, David L. Trent, Heiko Weiner
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Publication number: 20100076208Abstract: 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: ApplicationFiled: November 7, 2007Publication date: March 25, 2010Inventors: Sandeep S. Dhingra, Rick C. Schroden, Keith J. Watson, David G. Barton, Robert G. Bowman, Larry N. Ito, David L. Trent, Heiko Weiner
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Patent number: 7645717Abstract: 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: GrantFiled: May 21, 2004Date of Patent: January 12, 2010Assignee: Dow Global Technologies, Inc.Inventors: Sandeep S. Dhingra, Karla F. Mabe, Keith Jeffrey Watson
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Patent number: 6787124Abstract: 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: GrantFiled: February 14, 2003Date of Patent: September 7, 2004Assignee: ExxonMobil Research and Engineering CompanyInventors: Arthur W. Chester, Sandeep S. Dhingra, Stephen G. Casmer
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Patent number: 6676922Abstract: 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: GrantFiled: May 1, 2002Date of Patent: January 13, 2004Assignee: ExxonMobil Oil CorporationInventor: Sandeep S. Dhingra
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Patent number: 6656268Abstract: 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: GrantFiled: January 25, 2002Date of Patent: December 2, 2003Assignee: ExxonMobil Oil CorporationInventors: Sandeep S. Dhingra, Simon C. Weston
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Publication number: 20030185751Abstract: 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: ApplicationFiled: February 14, 2003Publication date: October 2, 2003Inventors: Arthur W. Chester, Sandeep S. Dhingra, Stephen G. Casmer
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Patent number: 6548709Abstract: 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: GrantFiled: October 9, 2001Date of Patent: April 15, 2003Assignee: 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
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Patent number: 6524551Abstract: 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: GrantFiled: January 25, 2002Date of Patent: February 25, 2003Assignee: ExxonMobil Oil CorporationInventor: Sandeep S. Dhingra
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Publication number: 20030012729Abstract: 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: ApplicationFiled: May 1, 2002Publication date: January 16, 2003Inventor: Sandeep S. Dhingra
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Publication number: 20020174824Abstract: 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: ApplicationFiled: January 25, 2002Publication date: November 28, 2002Inventors: Sandeep S. Dhingra, Simon C. Weston
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Publication number: 20020164284Abstract: This invention provides a process for the synthesis of MCM-58 using 1-(1-adamantyl) pyridinium cations as a directing agent.Type: ApplicationFiled: January 25, 2002Publication date: November 7, 2002Inventor: Sandeep S. Dhingra
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Publication number: 20020137971Abstract: 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: ApplicationFiled: October 9, 2001Publication date: September 26, 2002Inventors: Margaret M. Wu, Philip Trotto, Shifang Luo, Jose G. Santiesteban, Hye Kyung C. Timken, Sandeep S. Dhingra, Simon C. Weston, Richard T. Spissell
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Patent number: 6310265Abstract: 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: GrantFiled: November 1, 1999Date of Patent: October 30, 2001Assignee: 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
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Patent number: 6063262Abstract: 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: GrantFiled: December 30, 1998Date of Patent: May 16, 2000Assignee: Mobil Oil CorporationInventors: Sandeep S. Dhingra, Charles T. Kresge, Robin P. Ziebarth
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Patent number: 6054052Abstract: 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: GrantFiled: December 14, 1995Date of Patent: April 25, 2000Assignee: Mobil Oil CorporationInventors: Sandeep S. Dhingra, Charles T. Kresge, Sharon B. McCullen
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Patent number: 6049018Abstract: 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: GrantFiled: January 21, 1999Date of Patent: April 11, 2000Assignee: Mobil CorporationInventors: 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
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Patent number: 5705695Abstract: 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: GrantFiled: December 18, 1996Date of Patent: January 6, 1998Assignee: NEC Research Institute, Inc.Inventors: Robert C. Haushalter, Sandeep S. Dhingra