Patents by Inventor Dusanapudi Naga Venkata Raghavulu

Dusanapudi Naga Venkata Raghavulu 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 the Purification of Methylene Blue
    Publication number: 20220049102
    Abstract: The present application provides method for producing methylene blue that includes the steps of providing a reaction mixture having one or more methylene blue intermediates; precipitating metal from the reaction mixture; and producing therefrom crude methylene blue. The crude may further be purified, resulting in methylene compounds having low impurities, preferably having a purity greater than about 97%, having Azure B impurity no greater than 2.5%, and/or a total metal content no greater than 77 ppm. Formulations containing such compounds are also provided.
    Type: Application
    Filed: September 17, 2020
    Publication date: February 17, 2022
    Inventors: Ravishanker Kovi, Jayaraman Kannappan, Hemant Mande, Dusanapudi Naga Venkata Raghavulu