Patents by Inventor Sunil Rokade

Sunil Rokade 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).

  • Process for preparing precipitated silica
    Patent number: 11472710
    Abstract: A process for preparing precipitated silica, is disclosed. The process includes preparing an aqueous solution of sodium silicate having a pH in a range of 10.6 to 10.8, simultaneously adding to said aqueous solution of sodium silicate, a sodium silicate solution, water and an acid in at least two phases to obtain a reaction mixture, wherein in an initial phase the sodium silicate solution, the water and the acid is added till the sodium ion concentration of the reaction mixture is in range of 0.13 normal to 0.57 normal and in a final phase the sodium silicate solution, the water and the acid is added till the sodium ion concentration of the reaction mixture is in a range of 0.3 to 0.9 normal; acidifying the reaction mixture with the acid to a pH in a range of 3 to 4.5, aging the reaction mixture to obtain precipitated silica and recovering the precipitated silica from the reaction mixture.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: October 18, 2022
    Assignee: Tata Chemicals Limited
    Inventors: Prabhat Parida, Sunil Rokade, Debabrata Rautaray
  • A PROCESS FOR PREPARING PRECIPITATED SILICA
    Publication number: 20210122642
    Abstract: A process for preparing precipitated silica, is disclosed. The process includes preparing an aqueous solution of sodium silicate having a pH in a range of 10.6 to 10.8, simultaneously adding to said aqueous solution of sodium silicate, a sodium silicate solution, water and an acid in at least two phases to obtain a reaction mixture, wherein in an initial phase the sodium silicate solution, the water and the acid is added till the sodium ion concentration of the reaction mixture is in range of 0.13 normal to 0.57 normal and in a final phase the sodium silicate solution, the water and the acid is added till the sodium ion concentration of the reaction mixture is in a range of 0.3 to 0.9 normal; acidifying the reaction mixture with the acid to a pH in a range of 3 to 4.5, aging the reaction mixture to obtain precipitated silica and recovering the precipitated silica from the reaction mixture.
    Type: Application
    Filed: March 29, 2019
    Publication date: April 29, 2021
    Inventors: Prabhat Parida, Sunil Rokade, Debabrata Rautaray
  • Purification of rosuvatatin intermediate by thin film evaporation and chemical method
    Patent number: 7884226
    Abstract: Provided are processes for the purification of a pure rosuvastatin intermediate by thin film evaporation and chemical method, and conversion of the intermediate to rosuvastatin or salts thereof.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: February 8, 2011
    Assignee: Teva Pharmaceutical Industries, Ltd.
    Inventors: Tamar Nidam, Omer Malachi, Irena Veinberg, Valerie Niddam-Hildesheim, Vinod Kumar Kansal, Harish Ranjan, Appu Ekambaram Ponnuswamy, Sunil Rokad, Surat Kiran, Debashish Das
  • Purification of rosuvatatin intermediate by thin film evaporation and chemical method
    Publication number: 20090099383
    Abstract: Provided are processes for the purification of a pure rosuvastatin intermediate by thin film evaporation and chemical method, and conversion of the intermediate to rosuvastatin or salts thereof.
    Type: Application
    Filed: July 14, 2008
    Publication date: April 16, 2009
    Inventors: Tamar Nidam, Omer Malachi, Irena Veinberg, Valerie Niddam-Hildesheim, Vinod Kumar Kansal, Harish Ranjan, Appu Ekambaram Ponnuswamy, Sunil Rokad, Surat Kiran, Debashish Das