Patents by Inventor Rajam Karaikudi Sankaranarayana

Rajam Karaikudi Sankaranarayana 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: 8546284
    Abstract: Most widely used commercial zirconia powders are composed of porous particles 10-105 ?m and 45-75 ?m in size. Furthermore, these powders are mixtures of tetragonal, cubic, and monoclinic modifications, which indicate the heterogeneous distribution of the stabilizing yttria dopant in finished powder not suitable for Solid oxide fuel cell applications. Most of the methods reported in the prior art employs an additional agglomeration step which makes the process more expensive and laborious, Present invention provides a simple and economical process for the preparation of plasma grade yttria stabilized zirconia powder useful for applications in solid oxide fuel cells (SOFC) and thermal barrier coatings without the agglomeration step. Plasma grade yttria stabilized zirconia powders of present invention are prepared at different mole % of yttria varying from 3 to 12%.
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: October 1, 2013
    Assignee: Council of Scientific & Industrial Research
    Inventors: Aruna Singanahalli Thippareddy, Balaji Narayanawamy, Rajam Karaikudi Sankaranarayana
  • Publication number: 20100048379
    Abstract: Most widely used commercial zirconia powders are composed of porous particles 10-105 ?m and 45-75 ?m in size. Furthermore, these powders are mixtures of tetragonal, cubic, and monoclinic modifications, which indicate the heterogeneous distribution of the stabilizing yttria dopant in finished powder not suitable for Solid oxide fuel cell applications. Most of the methods reported in the prior art employs an additional agglomeration step which makes the process more expensive and laborious, Present invention provides a simple and economical process for the preparation of plasma grade yttria stabilized zirconia powder useful for applications in solid oxide fuel cells (SOFC) and thermal barrier coatings without the agglomeration step. Plasma grade yttria stabilized zirconia powders of present invention are prepared at different mole % of yttria varying from 3 to 12%.
    Type: Application
    Filed: May 6, 2009
    Publication date: February 25, 2010
    Inventors: Aruna Singanahalli Thippareddy, Balaji Narayanawamy, Rajam Karaikudi Sankaranarayana