Patents by Inventor Rajaiah Shrikrishnan

Rajaiah Shrikrishnan 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).

  • Purification of sulfentrazone herbicide using selective pH adjusted extractions
    Patent number: 11634392
    Abstract: A high yielding extraction process for the purification of N-(2,4-dichloro-5-(4-(difluoromethyl)-3-methyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl)methanesulfonamide (sulfentrazone) by selectively partitioning the desired product from the crude mixture, thereby increasing its purity by decreasing the presence of unwanted impurities and improving the color and particle size distribution of the final sulfentrazone product. The selective partitioning is achieved by the sequential use of an organic solvent, water, aqueous inorganic base and a concentrated aqueous inorganic acid.
    Type: Grant
    Filed: October 6, 2020
    Date of Patent: April 25, 2023
    Assignee: Tagros Chemicals India Pvt Ltd
    Inventors: Bomi P Framroze, Rajaiah Shrikrishnan, Rajagopal Kuppuswamy