Patents by Inventor Bojja Sreedhar

Bojja Sreedhar 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).

  • Method for adsorption and reduction of hexavalent chromium by using ferrous-saponite
    Patent number: 7273557
    Abstract: The present invention relates to the development of an improved methodology for adsorption and subsequent reduction of hexavalent chromium aimed at the total removal of hexavalent chromium in water, which comprises, reacting dichromate solutions with natural ferrous-saponite clays at temperature 50 to 200° C. for the period of 1 to 3.0 hours.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: September 25, 2007
    Assignee: Council of Scientific and Industrial Research
    Inventors: Gopalakrishnarao Parthasarathy, Bojja Sreedhar, Boyapati Manoranjan Choudhary
  • Layered double hydroxides supported nanopalladium catalysts for Heck-, Suzuki, Sonogashira-, and Stille type coupling reactions of haloarenes
    Patent number: 7049266
    Abstract: Processes for the preparation of nanopalladium (0) catalysts are disclosed. In some embodiments, the nanopalladium (0) catalysts may be reusable. In some embodiments, the nanopalladium (0) catalysts may be heterogeneous. Nanopalladium (0) catalysts may be employed for preparing coupling products by C—C bond formation through reaction of haloarenes in the presence of base. Haloarenes used in the coupling reaction may include chloroarenes that are typically unreactive. The use of heterogeneous nanopalladium catalyst may preclude the presence of trace amounts of palladium in the final coupling product.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: May 23, 2006
    Assignee: Indian Institute of Chemical Technology
    Inventors: Boyapati Manoranjan Choudary, Madhi Sateesh, Naidu Sreenivasa Chowdari, Mannepalli Lakshmi Kantam, Bojja Sreedhar
  • Layered double hydroxides supported nanopalladium catalysts for Heck-, Suzuki, Sonogashira-, and Stille type coupling reactions of haloarenes
    Publication number: 20040192542
    Abstract: The present invention relates to a novel process for the preparation of a reusable heterogeneous nanopalladium (0) catalysts, which is a eco-friendly and economical process employing re-usable heterogeneous catalyst in place of soluble palladium catalysts for preparing coupling products by C—C bond formation reaction of haloarenes that include unreactive chloroarenes in the presence of base. The use of heterogeneous nanopalladium catalyst precludes the presence of palladium in traces with the product.
    Type: Application
    Filed: March 31, 2003
    Publication date: September 30, 2004
    Inventors: Boyapati Manoranjan Choudary, Madhi Sateesh, Sreenivasa Chowdari Naidu, Mannepalli Lakshmi Kantam, Bojja Sreedhar