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).

  • Patent number: 11441234
    Abstract: 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: Grant
    Filed: October 12, 2020
    Date of Patent: September 13, 2022
    Assignee: University of Louisville Research Foundation, Inc.
    Inventors: Mahendra K. Sunkara, Daniel F. Jaramillo-Cabanzo, Sonia J. Calero-Barney
  • Patent number: 11306261
    Abstract: 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: Grant
    Filed: April 6, 2020
    Date of Patent: April 19, 2022
    Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
  • Patent number: 11180702
    Abstract: 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: Grant
    Filed: January 31, 2020
    Date of Patent: November 23, 2021
    Assignee: Advanced Energy Materials, LLC
    Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
  • Patent number: 11142837
    Abstract: 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: Grant
    Filed: September 26, 2019
    Date of Patent: October 12, 2021
    Assignee: University of Louisville Research Foundation, Inc.
    Inventors: Joshua Spurgeon, Mahendra K. Sunkara
  • Publication number: 20210108330
    Abstract: 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: Application
    Filed: October 12, 2020
    Publication date: April 15, 2021
    Inventors: Mahendra K. Sunkara, Daniel F. Jaramillo-Cabanzo, Sonia J. Calero-Barney
  • Publication number: 20200403224
    Abstract: 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: Application
    Filed: June 19, 2020
    Publication date: December 24, 2020
    Inventors: Gamini U. Sumanasekera, Mahendra K. Sunkara, Alejandro Martinez-Garcia, Ruchira Ravinath Dharmasena
  • Publication number: 20200388857
    Abstract: 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: Application
    Filed: June 2, 2020
    Publication date: December 10, 2020
    Inventors: Mahendra K. Sunkara, William F. Paxton, Alex M. Bates
  • Publication number: 20200231883
    Abstract: 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: Application
    Filed: April 6, 2020
    Publication date: July 23, 2020
    Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
  • Publication number: 20200181510
    Abstract: 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: Application
    Filed: January 31, 2020
    Publication date: June 11, 2020
    Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
  • Publication number: 20200102661
    Abstract: 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: Application
    Filed: September 26, 2019
    Publication date: April 2, 2020
    Inventors: Joshua Spurgeon, Mahendra K. Sunkara
  • Patent number: 10584289
    Abstract: 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: Grant
    Filed: December 29, 2017
    Date of Patent: March 10, 2020
    Assignee: Advanced Energy Materials
    Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
  • Publication number: 20180187094
    Abstract: 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: Application
    Filed: December 29, 2017
    Publication date: July 5, 2018
    Applicant: Advanced Energy Materials, LLC
    Inventors: Mahendra K. Sunkara, Sivakumar Vasireddy, Juan He, Vivekanand Kumar
  • Patent number: 5865971
    Abstract: 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: Grant
    Filed: March 21, 1997
    Date of Patent: February 2, 1999
    Assignee: Faraday Technology, Inc.
    Inventor: Mahendra K. Sunkara
  • Patent number: 5599437
    Abstract: 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: Grant
    Filed: June 20, 1995
    Date of Patent: February 4, 1997
    Assignee: Faraday Technology, Inc.
    Inventors: E. Jennings Taylor, Chengdong Zhou, Robert P. Renz, Mahendra K. Sunkara