Patents by Inventor Mallika Gummalla

Mallika Gummalla 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).

  • Publication number: 20200086239
    Abstract: Provided are techniques that include operating a spiral contactor. The techniques include receiving, by a spiral contactor, a first fluid, and receiving a second fluid, wherein the first fluid is different than the second fluid. The techniques also include exchanging the first fluid and the second fluid using the spiral contactor, and outputting a deoxygenated fluid from the spiral contactor, wherein the deoxygenated fluid has a lower oxygen concentration than the first fluid.
    Type: Application
    Filed: September 13, 2018
    Publication date: March 19, 2020
    Inventors: Haralambos Cordatos, Sergei F. Burlatsky, Mallika Gummalla
  • Patent number: 10135081
    Abstract: A system and method for warming a fuel cell on an aircraft, the system includes at least one fuel cell. The fuel cell includes an anode and a cathode for creating thermal and electrical energy. A temperature sensor measures a first temperature of the fuel cell. A control unit is coupled to the temperature sensor. The control unit increases the first temperature to a second temperature in response to the first temperature being at least equal to a selected temperature threshold. Increasing of the first temperature is indicative of the control unit operating in a warming mode. The second temperature is higher than the selected temperature threshold.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: November 20, 2018
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Conor Riordan, Dustin L. Kaap, Mallika Gummalla
  • Patent number: 9997794
    Abstract: A membrane electrode assembly is provided which includes an anode; a cathode; a membrane between the anode and the cathode; and a protective layer between the membrane and at least one electrode of the anode and the cathode, the protective layer having a layer of ionomer material containing a catalyst, the layer having a porosity of between 0 and 10%, an ionomer content of between 50 and 80% vol., a catalyst content of between 10 and 50% vol., and an electrical connectivity between catalyst particles of between 35 and 75%. A configuration using a precipitation layer to prevent migration of catalyst ions is also provided.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: June 12, 2018
    Assignee: Audi AG
    Inventors: Sergei F. Burlatsky, Ned E. Cipollini, David A. Condit, Thomas H. Madden, Sathya Motupally, Lesia V. Protsailo, Timothy W. Patterson, Lei Chen, Mallika Gummalla
  • Patent number: 9991521
    Abstract: A method for preparing dispersing particles in perfluorinated polymer ionomer includes combining particles and a perfluorinated ionomer precursor in a mixture, and converting the perfluorinated ionomer precursor to a perfluorinated proton-conducting ionomer in the presence of the particles.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: June 5, 2018
    Assignee: Audi AG
    Inventors: Zhiwei Yang, Mallika Gummalla
  • Patent number: 9923224
    Abstract: A proton exchange material includes a linear perfluorinated carbon backbone chain and a side chain extending off of the linear perfluorinated carbon backbone chain. The side chain includes at least one sulfonimide group, —SO2-NH—SO2-, and a carbon chain link between the at least one sulfonimide group and the linear perfluorinated carbon backbone chain. The carbon chain link has less than three carbon atoms.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: March 20, 2018
    Assignees: Audi AG, Toyota Jidosha Kabushiki Kaisha
    Inventors: Zhiwei Yang, Mallika Gummalla, Yoichi Hosokawa
  • Patent number: 9923223
    Abstract: A method of producing an electrolyte membrane includes providing a dispersion solution that has a crosslinked perfluorinated ionomer material and a linear perfluorinated ionomer material dispersed in a carrier fluid or mixture carrier fluids. The crosslinked perfluorinated ionomer material has an equivalent weight of 750 g/mol or less with respect to proton exchange acid groups. The linear perfluorinated ionomer material has an equivalent weight of 750 g/mol or more with respect to proton exchange as acid groups. At least a portion of the carrier fluid or fluids is removed from the dispersion solution to thereby form an electrolyte membrane with the crosslinked perfluorinated ionomer material and the linear perfluorinated ionomer material.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: March 20, 2018
    Assignee: Audi AG
    Inventors: Zhiwei Yang, Mallika Gummalla
  • Patent number: 9761899
    Abstract: An example of a stable electrode structure is to use a gradient electrode that employs large platinum particle catalyst in the close proximity to the membrane supported on conventional carbon and small platinum particles in the section of the electrode closer to a GDL supported on a stabilized carbon. Some electrode parameters that contribute to electrode performance stability and reduced change in ECA are platinum-to-carbon ratio, size of platinum particles in various parts of the electrode, use of other stable catalysts instead of large particle size platinum (alloy, etc), depth of each gradient sublayer. Another example of a stable electrode structure is to use a mixture of platinum particle sizes on a carbon support, such as using platinum particles that may be 6 nanometers and 3 nanometers. A conductive support is typically one or more of the carbon blacks.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: September 12, 2017
    Assignee: Audi AG
    Inventors: Lesia V. Protsailo, Laura Roen Stolar, Jesse M. Marzullo, Mallika Gummalla, Sergei F. Burlatsky
  • Patent number: 9716285
    Abstract: A method of manufacturing a proton conducting fuel cell composite membrane includes the step of electrospinning a non-charged polymeric material, such as PVDF and PSF, into fiber mats. The fibers are fused to one another to provide a welded porous mat. The welded porous mat is filled with proton conducting electrolyte, such as PFSA polymer, to generate a proton conducting composite membrane. The resulting proton conducting fuel cell membrane comprises a randomly oriented, three dimensional interlinked fiber lattice structure filled with proton conducting electrolyte, such as PFSA polymer.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: July 25, 2017
    Assignee: Audi AG
    Inventors: Mallika Gummalla, Zhiwei Yang, Peter Pintauro, Kyung Min Lee, Ryszard Wycisk
  • Patent number: 9663600
    Abstract: A method of fabricating low EW, water insoluble electrolyte materials includes providing a perfluorinated polymer resin that includes perfluorinated carbon-carbon backbone chain and sulfonyl fluoride ended perfluorinated side chains, extending from the perfluorinated backbone chains via an ether linkage, exposing the perfluorinated polymer resin to ammonia gas to convert the sulfonyl fluoride groups to sulfonamide groups, —SO2—NH2, which reacts with sulfonyl fluoride containing chemical agent(s) to form sulfonimide groups, and at the same time, generates low EW, 3-dimensional cross-linked, water-insoluble perfluorinated polymer electrolyte materials.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: May 30, 2017
    Assignees: Audi AG, Toyota Jidosha Kabushiki Kaisha, The Board of Trustees of the University of Alabama
    Inventors: Zhiwei Yang, Mallika Gummalla, Yoichi Hosokawa, Joseph S. Thrasher, Todd S. Sayler, Andrej Matsnev, Richard Edward Fernandez, Alfred Waterfeld
  • Publication number: 20160380288
    Abstract: A system and method for warming a fuel cell on an aircraft, the system includes at least one fuel cell. The fuel cell includes an anode and a cathode for creating thermal and electrical energy. A temperature sensor measures a first temperature of the fuel cell. A control unit is coupled to the temperature sensor. The control unit increases the first temperature to a second temperature in response to the first temperature being at least equal to a selected temperature threshold. Increasing of the first temperature is indicative of the control unit operating in a warming mode. The second temperature is higher than the selected temperature threshold.
    Type: Application
    Filed: September 13, 2016
    Publication date: December 29, 2016
    Inventors: Conor Riordan, Dustin L. Kaap, Mallika Gummalla
  • Patent number: 9472819
    Abstract: A system and method for warming a fuel cell on an aircraft, the system includes at least one fuel cell. The fuel cell includes an anode and a cathode for creating thermal and electrical energy. A temperature sensor measures a first temperature of the fuel cell. A control unit is coupled to the temperature sensor. The control unit increases the first temperature to a second temperature in response to the first temperature being at least equal to a selected temperature threshold. Increasing of the first temperature is indicative of the control unit operating in a warming mode. The second temperature is higher than the selected temperature threshold.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: October 18, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Conor Riordan, Dustin L. Kaap, Mallika Gummalla
  • Publication number: 20160181643
    Abstract: A method of fabricating an electrolyte membrane includes providing a reinforcement substrate that has impregnated therein a linear perfluorinated electrolyte polymer resin, and cross-linking the electrolyte polymer resin in-situ in the reinforcement substrate to thereby form a reinforced electrolyte membrane with cross-linked perfluorinated electrolyte polymer material impregnated therein.
    Type: Application
    Filed: August 6, 2013
    Publication date: June 23, 2016
    Inventors: Zhiwei YANG, Mallika GUMMALLA, Joseph S. THRASHER, Yoichi HOSOKAWA
  • Publication number: 20150349362
    Abstract: A membrane electrode assembly is provided which includes an anode; a cathode; a membrane between the anode and the cathode; and a protective layer between the membrane and at least one electrode of the anode and the cathode, the protective layer having a layer of ionomer material containing a catalyst, the layer having a porosity of between 0 and 10%, an ionomer content of between 50 and 80% vol., a catalyst content of between 10 and 50% vol., and an electrical connectivity between catalyst particles of between 35 and 75%. A configuration using a precipitation layer to prevent migration of catalyst ions is also provided.
    Type: Application
    Filed: April 1, 2015
    Publication date: December 3, 2015
    Inventors: Sergei F. Burlatsky, Ned E. Cipollini, David A. Condit, Thomas H. Madden, Sathya Motupally, Lesia V. Protsailo, Timothy W. Patterson, Lei Chen, Mallika Gummalla
  • Publication number: 20150340721
    Abstract: A method of producing an electrolyte membrane includes providing a dispersion solution that has a crosslinked perfluorinated ionomer material and a linear perfluorinated ionomer material dispersed in a carrier fluid or mixture carrier fluids. The crosslinked perfluorinated ionomer material has an equivalent weight of 750 g/mol or less with respect to proton exchange acid groups. The linear perfluorinated ionomer material has an equivalent weight of 750 g/mol or more with respect to proton exchange as acid groups. At least a portion of the carrier fluid or fluids is removed from the dispersion solution to thereby form an electrolyte membrane with the crosslinked perfluorinated ionomer material and the linear perfluorinated ionomer material.
    Type: Application
    Filed: December 21, 2012
    Publication date: November 26, 2015
    Applicant: AUDI AG
    Inventors: Zhiwei YANG, Mallika GUMMALLA
  • Publication number: 20150337064
    Abstract: A method of fabricating low EW, water insoluble electrolyte materials includes providing a perfluorinated polymer resin that includes perfluorinated carbon-carbon backbone chain and sulfonyl fluoride ended perfluorinated side chains, extending from the perfluorinated backbone chains via an ether linkage, exposing the perfluorinated polymer resin to ammonia gas to convert the sulfonyl fluoride groups to sulfonamide groups, —SO2—NH2, which reacts with sulfonyl fluoride containing chemical agent(s) to form sulfonimide groups, and at the same time, generates low EW, 3-dimensional cross-linked, water-insoluble perfluorinated polymer electrolyte materials.
    Type: Application
    Filed: December 21, 2012
    Publication date: November 26, 2015
    Inventors: Zhiwei YANG, Mallika GUMMALLA, Yoichi HOSOKAWA, Joseph S. THRASHER, Todd S. SAYLER, Andrej MATSNEV, Richard Edward FERNANDEZ, Alfred WATERFELD
  • Publication number: 20150333354
    Abstract: A proton exchange material includes a linear perfluorinated carbon backbone chain and a side chain extending off of the linear perfluorinated carbon backbone chain. The side chain includes at least one sulfonimide group, —SO2—NH—SO2—, and a carbon chain link between the at least one sulfonimide group and the linear perfluorinated carbon backbone chain. The carbon chain link has less than three carbon atoms.
    Type: Application
    Filed: December 21, 2012
    Publication date: November 19, 2015
    Inventors: Zhiwei YANG, Mallika GUMMALLA, Yoichi HOSOKAWA
  • Patent number: 9118054
    Abstract: A power system for an aircraft includes a solid oxide fuel cell system which generates electric power for the aircraft and an exhaust stream; and a heat exchanger for transferring heat from the exhaust stream of the solid oxide fuel cell to a heat requiring system or component of the aircraft. The heat can be transferred to fuel for the primary engine of the aircraft. Further, the same fuel can be used to power both the primary engine and the SOFC. A heat exchanger is positioned to cool reformate before feeding to the fuel cell. SOFC exhaust is treated and used as inerting gas. Finally, oxidant to the SOFC can be obtained from the aircraft cabin, or exterior, or both.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: August 25, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Mallika Gummalla, Jean Yamanis, Benoit Olsommer, Zissis Dardas, Robert Bayt, Hari Srinivasan, Arindam Dasgupta, Larry Hardin
  • Patent number: 9065088
    Abstract: A fuel cell device includes a plurality of channels that have at least one unrestricted inlet, a conduit for directing a flow having a distribution pattern to the unrestricted inlet, and a gap region between the conduit and the plurality of channels for receiving the flow distribution pattern, the gap region having such dimensions in which the distribution pattern tends to normalize within the gap region so that flow to each of the unrestricted inlets tends to normalize across said gap region.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: June 23, 2015
    Assignees: Audi AG, Toyota Jidosha Kabushiki Kaisha
    Inventors: Arun Pandy, Louis Chiappetta, Jr., Robert Mason Darling, Mallika Gummalla
  • Patent number: 9023551
    Abstract: A membrane electrode assembly is provided which includes an anode; a cathode; a membrane between the anode and the cathode; and a protective layer between the membrane and at least one electrode of the anode and the cathode, the protective layer having a layer of ionomer material containing a catalyst, the layer having a porosity of between 0 and 10%, an ionomer content of between 50 and 80% vol., a catalyst content of between 10 and 50% vol., and an electrical connectivity between catalyst particles of between 35 and 75%. A configuration using a precipitation layer to prevent migration of catalyst ions is also provided.
    Type: Grant
    Filed: January 3, 2008
    Date of Patent: May 5, 2015
    Assignee: Ballard Power Systems Inc.
    Inventors: Sergei F. Burlatsky, Ned E. Cipollini, David A. Condit, Thomas H. Madden, Sathya Motupally, Lesia V. Protsailo, Timothy W. Patterson, Lei Chen, Mallika Gummalla
  • Publication number: 20150051065
    Abstract: A method for preparing dispersing particles in perfluorinated polymer ionomer includes combining particles and a perfluorinated ionomer precursor in a mixture, and converting the perfluorinated ionomer precursor to a perfluorinated proton-conducting ionomer in the presence of the particles.
    Type: Application
    Filed: April 23, 2012
    Publication date: February 19, 2015
    Applicant: Ballard Power Systems Inc.
    Inventors: Zhiwei Yang, Mallika Gummalla