Patents by Inventor Rangachary Mukundan

Rangachary Mukundan 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: 10826076
    Abstract: Disclosed herein are embodiments of a patterned electrode comprising regions of catalyst and segregating regions that separate the regions of catalyst. The segregating regions may be regions of non-catalytic material. The catalyst regions may correspond to the channels of a flow field. The electrode provides improved fuel cell performance, particularly at high current densities. The electrode may be for all suitable applications, such as in a membrane electrode assembly and/or a fuel cell. Also disclosed is a method for making the patterned electrode. The method may comprise using masks to apply the catalyst and non-catalyst material to a substrate.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: November 3, 2020
    Assignee: Triad National Security, LLC
    Inventors: Natalia Macauley, Siddharth Komini Babu, Rangachary Mukundan, Mahlon S. Wilson, Rodney L. Borup, Stephen Grot
  • Publication number: 20200321626
    Abstract: A polymer electrolyte fuel cell (PEFC), comprises a first electrode and a second electrode, wherein the first electrode includes a coaxial nanowire electrode. In some embodiments, the coaxial nanowire electrode comprises a plurality of ionomer nanowires, and a catalyst coating that coats at least part of the ionomer nanowires. Moreover, in some embodiments, a nanowire of the plurality of ionomer nanowires and a section of the catalyst coating that coats the nanowire form two coaxial cylinders.
    Type: Application
    Filed: April 3, 2020
    Publication date: October 8, 2020
    Applicant: Triad National Security, LLC
    Inventors: Siddharth Komini Babu, Jacob Schatz Spendelow, Rangachary Mukundan
  • Patent number: 10490833
    Abstract: A fuel quality analyzer for detecting contaminants in a fuel supply includes an anode flow field plate defining a first fuel flow field channel and a fuel inlet port, a cathode flow field plate defining a second fuel flow field channel and a fuel outlet port, a polymer electrolyte membrane between the anode and cathode flow field plates, a first electrode between the anode flow field plate and the polymer electrolyte membrane, and a second electrode between the cathode flow field plate and the polymer electrolyte membrane. The second electrode has a higher platinum loading than the first electrode. A reservoir volume is defined by the anode and cathode flow field plates. At least a portion of the polymer electrolyte membrane extends into the reservoir volume. The reservoir volume is configured to retain water to humidify the polymer electrolyte membrane.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: November 26, 2019
    Assignee: TRIAD NATIONAL SECURITY, LLC
    Inventors: Eric L. Brosha, Tommy Rockward, Christopher J. Romero, Mahlon S. Wilson, Cortney R. Kreller, Rangachary Mukundan
  • Patent number: 7736547
    Abstract: A method of producing a proton conducting material, comprising adding a pyrophosphate salt to a solvent to produce a dissolved pyrophosphate salt; adding an inorganic acid salt to a solvent to produce a dissolved inorganic acid salt; adding the dissolved inorganic acid salt to the dissolved pyrophosphate salt to produce a mixture; substantially evaporating the solvent from the mixture to produce a precipitate; and calcining the precipitate at a temperature of from about 400° C. to about 1200° C.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: June 15, 2010
    Assignee: Los Alamos National Security, LLC
    Inventors: Fernando Henry Garzon, Melinda Lou Einsla, Rangachary Mukundan
  • Publication number: 20090230365
    Abstract: A method of producing a proton conducting material, comprising adding a pyrophosphate salt to a solvent to produce a dissolved pyrophosphate salt; adding an inorganic acid salt to a solvent to produce a dissolved inorganic acid salt; adding the dissolved inorganic acid salt to the dissolved pyrophosphate salt to produce a mixture; substantially evaporating the solvent from the mixture to produce a precipitate; and calcining the precipitate at a temperature of from about 400° C. to about 1200° C.
    Type: Application
    Filed: March 11, 2008
    Publication date: September 17, 2009
    Inventors: Fernando Henry Garzon, Melinda Lou Einsla, Rangachary Mukundan
  • Patent number: 7575709
    Abstract: A method of making electrochemical sensors in which an electrolyte material is cast into a tape. Prefabricated electrodes are then partially embedded between two wet layers of the electrolyte tape to form a green sensor, and the green sensor is then heated to sinter the electrolyte tape around the electrodes. The resulting sensors can be used in applications such as, but not limited to, combustion control, environmental monitoring, and explosive detection. A electrochemical sensor formed by the tape-casting method is also disclosed.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: August 18, 2009
    Assignee: Los Alamos National Security, LLC
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando H. Garzon
  • Publication number: 20080006532
    Abstract: The present invention relates to an electrochemical gas sensor for measuring gas concentrations of chemical species. More particularly, the invention relates to an electrochemical sensor that measures ammonia and total nitrogen oxides.
    Type: Application
    Filed: August 1, 2007
    Publication date: January 10, 2008
    Inventors: Rangachary Mukundan, Eric Brosha, Fernando Garzon
  • Patent number: 7264700
    Abstract: A mixed potential sensor for oxidizable or reducible gases and a method of making. A substrate is provided and two electrodes are formed on a first surface of the substrate, each electrode being formed of a different catalytic material selected to produce a differential voltage between the electrodes from electrochemical reactions of the gases catalyzed by the electrode materials. An electrolytic layer of an electrolyte is formed over the electrodes to cover a first portion of the electrodes from direct exposure to the gases with a second portion of the electrodes uncovered for direct exposure to the gases.
    Type: Grant
    Filed: January 20, 2004
    Date of Patent: September 4, 2007
    Assignee: Los Alamos National Security, LLC
    Inventors: Fernando H. Garzon, Eric L. Brosha, Rangachary Mukundan
  • Publication number: 20070193883
    Abstract: A mixed potential sensor for oxidizable or reducible gases and a method of making. A substrate is provided and two electrodes are formed on a first surface of the substrate, each electrode being formed of a different catalytic material selected to produce a differential voltage between the electrodes from electrochemical reactions of the gases catalyzed by the electrode materials. An electrolytic layer of an electrolyte is formed over the electrodes to cover a first portion of the electrodes from direct exposure to the gases with a second portion of the electrodes uncovered for direct exposure to the gases.
    Type: Application
    Filed: January 20, 2004
    Publication date: August 23, 2007
    Inventors: Fernando Garzon, Eric Brosha, Rangachary Mukundan
  • Patent number: 7214333
    Abstract: A mixed potential electrochemical sensor for the detection of gases has a ceria-based electrolyte with a surface for exposing to the gases to be detected, and with a reference wire electrode and a sensing wire electrode extending through the surface and fixed within the electrolyte as the electrolyte is compressed and sintered. The electrochemical sensor is formed by placing a wire reference electrode and a wire sensing electrode in a die, where each electrode has a first compressed planar section and a second section depending from the first section with the second section of each electrode extending axially within the die. The die is filled with an oxide-electrolyte powder and the powder is pressed within the die with the wire electrodes. The wire-electrodes and the pressed oxide-electrolyte powder are sintered to form a ceramic electrolyte base with a reference wire electrode and a sensing wire electrode depending therefrom.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: May 8, 2007
    Assignee: Los Alamos National Security, LLC
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando Garzon
  • Publication number: 20060231987
    Abstract: A method of making electrochemical sensors in which an electrolyte material is cast into a tape. Prefabricated electrodes are then partially embedded between two wet layers of the electrolyte tape to form a green sensor, and the green sensor is then heated to sinter the electrolyte tape around the electrodes. The resulting sensors can be used in applications such as, but not limited to, combustion control, environmental monitoring, and explosive detection. A electrochemical sensor formed by the tape-casting method is also disclosed.
    Type: Application
    Filed: April 19, 2005
    Publication date: October 19, 2006
    Inventors: Rangachary Mukundan, Eric Brosha, Fernando Garzon
  • Publication number: 20060231420
    Abstract: A solid state electrochemical gas sensor for detecting trace amounts of explosive materials and a method of detecting such explosives. The sensor has at least two electrodes. The at least two electrodes include a first catalytic electrode and a second catalytic electrode that are dissimilar and an electrolyte disposed between the first catalytic electrode and the second catalytic electrode. The sensor detects at least one gaseous specie emitted by the explosive material. At least one of a potential difference and a current flow is generated by at least one of catalytic and electrochemical reactions of the gaseous species emitted by the explosive material on one of the first catalytic electrode, second catalytic electrode, and the electrolyte. An explosive detection system that incorporates such sensors and methods is also described.
    Type: Application
    Filed: April 19, 2005
    Publication date: October 19, 2006
    Inventors: Fernando Garzon, Eric Brosha, Rangachary Mukundan
  • Publication number: 20040112744
    Abstract: A hydrocarbon sensor is formed with an electrolyte body having a first electrolyte surface with a reference electrode depending therefrom and a metal oxide electrode body contained within the electrolyte body and having a first electrode surface coplanar with the first electrolyte surface. The sensor was formed by forming a sintered metal-oxide electrode body and placing the metal-oxide electrode body within an electrolyte powder. The electrolyte powder with the metal-oxide electrode body was pressed to form a pressed electrolyte body containing the metal-oxide electrode body. The electrolyte was removed from an electrolyte surface above the metal-oxide electrode body to expose a metal-oxide electrode surface that is coplanar with the electrolyte surface. The electrolyte body and the metal-oxide electrode body were then sintered to form the hydrocarbon sensor.
    Type: Application
    Filed: November 25, 2003
    Publication date: June 17, 2004
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando Garzon
  • Publication number: 20040016104
    Abstract: A mixed potential electrochemical sensor for the detection of gases has a ceria-based electrolyte with a surface for exposing to the gases to be detected, and with a reference wire electrode and a sensing wire electrode extending through the surface and fixed within the electrolyte as the electrolyte is compressed and sintered. The electrochemical sensor is formed by placing a wire reference electrode and a wire sensing electrode in a die, where each electrode has a first compressed planar section and a second section depending from the first section with the second section of each electrode extending axially within the die. The die is filled with an oxide-electrolyte powder and the powder is pressed within the die with the wire electrodes. The wire-electrodes and the pressed oxide-electrolyte powder are sintered to form a ceramic electrolyte base with a reference wire electrode and a sensing wire electrode depending therefrom.
    Type: Application
    Filed: July 18, 2003
    Publication date: January 29, 2004
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando Garzon
  • Patent number: 6656336
    Abstract: A hydrocarbon sensor is formed with an electrolyte body having a first electrolyte surface with a reference electrode depending therefrom and a metal oxide electrode body contained within the electrolyte body and having a first electrode surface coplanar with the first electrolyte surface. The sensor was formed by forming a sintered metal-oxide electrode body and placing the metal-oxide electrode body within an electrolyte powder. The electrolyte powder with the metal-oxide electrode body was pressed to form a pressed electrolyte body containing the metal-oxide electrode body. The electrolyte was removed from an electrolyte surface above the metal-oxide electrode body to expose a metal-oxide electrode surface that is coplanar with the electrolyte surface. The electrolyte body and the metal-oxide electrode body were then sintered to form the hydrocarbon sensor.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: December 2, 2003
    Assignee: The Regents of the University of California
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando Garzon
  • Patent number: 6605202
    Abstract: A mixed potential electrochemical sensor for the detection of gases has a ceria-based electrolyte with a surface for exposing to the gases to be detected, and with a reference wire electrode and a sensing wire electrode extending through the surface and fixed within the electrolyte as the electrolyte is compressed and sintered. The electrochemical sensor is formed by placing a wire reference electrode and a wire sensing electrode in a die, where each electrode has a first compressed planar section and a second section depending from the first section with the second section of each electrode extending axially within the die. The die is filled with an oxide-electrolyte powder and the powder is pressed within the die with the wire electrodes. The wire-electrodes and the pressed oxide-electrolyte powder are sintered to form a ceramic electrolyte base with a reference wire electrode and a sensing wire electrode depending therefrom.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: August 12, 2003
    Assignee: The Regents of the University of California
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando Garzon
  • Publication number: 20020185376
    Abstract: A hydrocarbon sensor is formed with an electrolyte body having a first electrolyte surface with a reference electrode depending therefrom and a metal oxide electrode body contained within the electrolyte body and having a first electrode surface coplanar with the first electrolyte surface. The sensor was formed by forming a sintered metal-oxide electrode body and placing the metal-oxide electrode body within an electrolyte powder. The electrolyte powder with the metal-oxide electrode body was pressed to form a pressed electrolyte body containing the metal-oxide electrode body. The electrolyte was removed from an electrolyte surface above the metal-oxide electrode body to expose a metal-oxide electrode surface that is coplanar with the electrolyte surface. The electrolyte body and the metal-oxide electrode body were then sintered to form the hydrocarbon sensor.
    Type: Application
    Filed: May 30, 2002
    Publication date: December 12, 2002
    Inventors: Rangachary Mukundan, Eric L. Brosha, Fernando Garzon