Patents by Inventor Mahendra K. Sunkara
Mahendra K. Sunkara 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: 11441234Abstract: Provided herein are methods of performing liquid phase epitaxy (LPE) of III-V compounds and alloys at low pressures using pulsed nitrogen plasma to form an epitaxial layer e.g. on a substrate. The pulse sequence of plasma (with on and off time scales) enables LPE but avoids crust formation on top of molten metal. The concentration of nitrogen inside the molten metal is controlled to limit spontaneous nucleation.Type: GrantFiled: October 12, 2020Date of Patent: September 13, 2022Assignee: University of Louisville Research Foundation, Inc.Inventors: Mahendra K. Sunkara, Daniel F. Jaramillo-Cabanzo, Sonia J. Calero-Barney
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Patent number: 11306261Abstract: The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.Type: GrantFiled: April 6, 2020Date of Patent: April 19, 2022Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
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Patent number: 11180702Abstract: The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.Type: GrantFiled: January 31, 2020Date of Patent: November 23, 2021Assignee: Advanced Energy Materials, LLCInventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
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Patent number: 11142837Abstract: Electrocatalysts of formula Al?x,BxO3??, wherein A=a metal with an acid-stable oxide and B=a platinum-group-metal (PGM), are provided, as are methods of making the electrocatalysts via rapid plasma oxidation, methods of using the electrocatalysts to catalyze e.g. oxygen evolution reactions (OERs), and devices comprising the electrocatalysts.Type: GrantFiled: September 26, 2019Date of Patent: October 12, 2021Assignee: University of Louisville Research Foundation, Inc.Inventors: Joshua Spurgeon, Mahendra K. Sunkara
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Publication number: 20210108330Abstract: Provided herein are methods of performing liquid phase epitaxy (LPE) of III-V compounds and alloys at low pressures using pulsed nitrogen plasma to form an epitaxial layer e.g. on a substrate. The pulse sequence of plasma (with on and off time scales) enables LPE but avoids crust formation on top of molten metal. The concentration of nitrogen inside the molten metal is controlled to limit spontaneous nucleation.Type: ApplicationFiled: October 12, 2020Publication date: April 15, 2021Inventors: Mahendra K. Sunkara, Daniel F. Jaramillo-Cabanzo, Sonia J. Calero-Barney
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Publication number: 20200403224Abstract: A high capacity anode material comprising pre-lithiated ?-MoO3 nanostructures is provided. A lithium sulfur full cell, battery, or pouch cell comprising the anode material and methods of fabricating the same are also provided.Type: ApplicationFiled: June 19, 2020Publication date: December 24, 2020Inventors: Gamini U. Sumanasekera, Mahendra K. Sunkara, Alejandro Martinez-Garcia, Ruchira Ravinath Dharmasena
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Publication number: 20200388857Abstract: A redox flow battery comprising a positive electrode; a negative electrode; and an ion-exchange separator, wherein at least one of the positive electrode and the negative electrode is a conductive diamond electrode, and wherein a positive electrode electrolyte and/or a negative electrode electrolyte is in contact with diamond is provided. A boron doped diamond configured as an electrode in a redox flow battery is also provided.Type: ApplicationFiled: June 2, 2020Publication date: December 10, 2020Inventors: Mahendra K. Sunkara, William F. Paxton, Alex M. Bates
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Publication number: 20200231883Abstract: The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.Type: ApplicationFiled: April 6, 2020Publication date: July 23, 2020Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
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Publication number: 20200181510Abstract: The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.Type: ApplicationFiled: January 31, 2020Publication date: June 11, 2020Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
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Publication number: 20200102661Abstract: Electrocatalysts of formula Al?x,BxO3??, wherein A=a metal with an acid-stable oxide and B=a platinum-group-metal (PGM), are provided, as are methods of making the electrocatalysts via rapid plasma oxidation, methods of using the electrocatalysts to catalyze e.g. oxygen evolution reactions (OERs), and devices comprising the electrocatalysts.Type: ApplicationFiled: September 26, 2019Publication date: April 2, 2020Inventors: Joshua Spurgeon, Mahendra K. Sunkara
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Patent number: 10584289Abstract: The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.Type: GrantFiled: December 29, 2017Date of Patent: March 10, 2020Assignee: Advanced Energy MaterialsInventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
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Publication number: 20180187094Abstract: The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.Type: ApplicationFiled: December 29, 2017Publication date: July 5, 2018Applicant: Advanced Energy Materials, LLCInventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
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Patent number: 5865971Abstract: A sealing ring containing an electrode for sensing electrochemical conditions within a fluid handling system, in particular, the occurrence of crevice corrosion, has a body formed of a continuous loop of an electrically insulating fluid-impervious material having a surface which can form a fluid-tight seal with elements of a fluid handling apparatus, an electrode embedded within the body and electrically insulated from electronic conductive contact with those portions of the surface of the body that contact the fluid handling apparatus, and channels extending between the electrode and the surface of the body of the sealing ring to permit electrochemical contact between the electrode and the fluid within the system. The sealing ring also includes electronically conductive wires to connect the embedded electrode to external electrical devices, e.g., electronic measuring equipment.Type: GrantFiled: March 21, 1997Date of Patent: February 2, 1999Assignee: Faraday Technology, Inc.Inventor: Mahendra K. Sunkara
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Patent number: 5599437Abstract: A waste solution containing electroactive species, e.g., metal ions, can be remediated to very low levels of contaminant by an electrolysis method including the steps of introducing an electrolyte containing an electroactive species into an electrolytic cell having a cathode and an anode, producing a flow of the electrolyte past at least one of the electrodes at an electrolyte flow rate, and passing an electric current through the solution between the anode and the cathode whereby the electroactive species undergoes an electrochemical reaction at one of the electrodes at an electrochemical reaction rate, using an electric current pulsed at a frequency of 0.5 to 1000 Hertz and a duty cycle of not greater than 50%, and adjusting the electrolyte flow rate for the pulsed current electrolysis such that the electrochemical reaction rate for pulsed current electrolysis is greater than the electrochemical reaction rate for direct current electrolysis.Type: GrantFiled: June 20, 1995Date of Patent: February 4, 1997Assignee: Faraday Technology, Inc.Inventors: E. Jennings Taylor, Chengdong Zhou, Robert P. Renz, Mahendra K. Sunkara