Patents by Inventor Nalini Subramanian

Nalini Subramanian 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).

  • Fuel cell electrodes with graded properties and method of making
    Patent number: 8574790
    Abstract: A graded electrode is described. The graded electrode includes a substrate; and at least two electrode layers on the substrate forming a combined electrode layer, a composition of the at least two electrode layers being different, the combined electrode layer having an average level of the property that changes across the substrate. Fuel cells using graded electrodes and methods of making graded electrodes are also described.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: November 5, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Puneet K. Sinha, Balasubramanian Lakshmanan, Scott C. Moose, Nalini Subramanian
  • FUEL CELL ELECTRODES WITH GRADED PROPERTIES AND METHOD OF MAKING
    Publication number: 20120082917
    Abstract: A graded electrode is described. The graded electrode includes a substrate; and at least two electrode layers on the substrate forming a combined electrode layer, a composition of the at least two electrode layers being different, the combined electrode layer having an average level of the property that changes across the substrate. Fuel cells using graded electrodes and methods of making graded electrodes are also described.
    Type: Application
    Filed: October 4, 2010
    Publication date: April 5, 2012
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Puneet K. Sinha, Balasubramanian Lakshmanan, Scott C. Moose, Nalini Subramanian
  • Composite catalysts supported on modified carbon substrates and methods of making the same
    Patent number: 7618915
    Abstract: A method of producing a composite carbon catalyst is generally disclosed. The method includes oxidizing a carbon precursor (e.g., carbon black). Optionally, nitrogen functional groups can be added to the oxidized carbon precursor. Then, the oxidized carbon precursor is refluxed with a non-platinum transitional metal precursor in a solution. Finally, the solution is pyrolyzed at a temperature of at least about 500° C.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: November 17, 2009
    Inventors: Branko N. Popov, Nalini Subramanian, Hector R. Colon-Mercado
  • Composite catalysts supported on modified carbon substrates and methods of making the same
    Publication number: 20080113859
    Abstract: A method of producing a composite carbon catalyst is generally disclosed. The method includes oxidizing a carbon precursor (e.g., carbon black). Optionally, nitrogen functional groups can be added to the oxidized carbon precursor. Then, the oxidized carbon precursor is refluxed with a non-platinum transitional metal precursor in a solution. Finally, the solution is pyrolyzed at a temperature of at least about 500° C.
    Type: Application
    Filed: May 8, 2007
    Publication date: May 15, 2008
    Applicant: University of South Carolina
    Inventors: Branko Popov, Nalini Subramanian, Hector Colon-Mercado