Patents by Inventor Srinivas Bollepalli

Srinivas Bollepalli 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).

  • Sulfonated conducting polymer-grafted carbon material for fuel cell applications
    Patent number: 7413683
    Abstract: A composition comprising particulate carbonaceous material and a sulfonated conducting polymer containing hetero atoms. The composition can further comprise a metal. Devices comprising the composition can be constructed including supported electrocatalysts, membrane electrode assemblies, and fuel cells. A method for preparing the composition comprises oxidatively polymerizing a monomer of a conducting polymer containing hetero atoms in the presence of a carbonaceous material and sulfonating the polymer or the monomer. The method grafts the sulfonated conducting polymer to the carbonaceous material. The method can further comprise metallizing the polymer-grafted carbonaceous material.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: August 19, 2008
    Assignee: Columbian Chemicals Company
    Inventor: Srinivas Bollepalli
  • Sulfonated conducting polymer-grafted carbon material for fuel cell applications
    Patent number: 7390441
    Abstract: A composition comprising particulate carbonaceous material and a sulfonated conducting polymer containing hetero atoms. The composition can further comprise a metal. Devices comprising the composition can be constructed including supported electrocatalysts, membrane electrode assemblies, and fuel cells. A method for preparing the composition comprises oxidatively polymerizing with ozone a monomer of a conducting polymer containing hetero atoms in the presence of a carbonaceous material and sulfonating the polymer or the monomer. The method grafts the sulfonated conducting polymer to the carbonaceous material. The method can further comprise metallizing the polymer-grafted carbonaceous material.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: June 24, 2008
    Assignee: Columbian Chemicals Company
    Inventor: Srinivas Bollepalli
  • Pixelated masks for high resolution photolithography
    Publication number: 20070143732
    Abstract: Some embodiments of the present invention include apparatuses and methods relating to pixelated masks for high resolution photolithography.
    Type: Application
    Filed: December 1, 2005
    Publication date: June 21, 2007
    Inventors: Srinivas Bollepalli, Paul Davids, Vivek Singh
  • Determining an optimizaton for generating a pixelated photolithography mask with high resolution imaging capability
    Publication number: 20070006113
    Abstract: A pixelated photolithography mask is optimized for high resolution microelectronic processing. In one embodiment, the invention includes synthesizing a pixelated photolithography mask, applying a pixel flipping function to the mask, comparing the resulting mask to a desired result, and synthesizing an optimized pixelated binary photolithography mask using the function.
    Type: Application
    Filed: June 30, 2005
    Publication date: January 4, 2007
    Inventors: Bin Hu, Vivek Singh, Bikram Baidya, Kenny Toh, Srinivas Bollepalli, Yan Borodovsky
  • Carbon supported catalyst having reduced water retention
    Publication number: 20060068987
    Abstract: Compositions are disclosed for carbon supported catalysts with high metal loadings, high electrochemically active surface area, and good water management properties. In one aspect, the invention is directed to a carbon supported catalyst comprising a carbonaceous substrate and a dispersed metal, wherein the carbonaceous substrate has an electron microscopy surface area to nitrogen surface area ratio of at least 0.5 and a nitrogen surface area of at least 100 m2/g.
    Type: Application
    Filed: March 30, 2005
    Publication date: March 30, 2006
    Inventors: Srinivas Bollepalli, Anderson Dotson, Sanket Desai, George Joyce, Kevin Hathcock, Rodney Taylor