Patents by Inventor Ravindra Vedantham

Ravindra Vedantham 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).

  • Polymorphic forms of tadalafil
    Patent number: 8063214
    Abstract: A process for preparing crystalline Form A of tadalafil (I), comprising crystallization from a solution of tadalafil in a solvent comprising a C3-C7 ester, a ketone, dimethylformamide, dimethylsulfoxide, ethanol, acetonitrile, a chlorinated hydrocarbon, t-butanol, N,N-dimethylacetamide, dioxane, N-methyl pyrrolidone, or a mixture of any two or more thereof.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: November 22, 2011
    Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, Inc.
    Inventors: Eswaraiah Sajja, Venkata Naga Kali Vara Prasada Raju Vetukuri, Srinivas Reddy Ningam, Ravindra Vedantham, Rajyalakshmi Bodepudi
  • PREPARATION OF CITALOPRAM AND SALTS THEREOF
    Publication number: 20100087664
    Abstract: Process for the preparation of citalopram and its salts, comprising reacting magnesium (5-cyano-2-(4-fluorobenzoyl)phenyl)methanolate bromide with 3-N,N-dimethylaminopropyl magnesium halide in a mixture of solvents, obtaining a diol intermediate in the form of its acid addition salt, and reacting the acid addition salt with sulfuric acid in an aqueous medium.
    Type: Application
    Filed: October 6, 2009
    Publication date: April 8, 2010
    Inventors: Ravindra Vedantham, Raveendra Reddy Chinta, Venkata Naga Kali Vara Prasada Raju Vetukuri, Ambaiah Boini, Veera Madhavi Sundaraneedi, Rama Krishna Venkata Medisetti, Kushal Surajmal Manudhane
  • POLYMORPHIC FORMS OF TADALAFIL
    Publication number: 20090131667
    Abstract: Polymorphic forms of tadalafil, and processes for their preparation.
    Type: Application
    Filed: October 26, 2005
    Publication date: May 21, 2009
    Inventors: Eswaraiah Sajja, Venkata Naga Kali Vara Prasada Raju Vetukuri, Srinivas Reddy Ningam, Ravindra Vedantham, Rajyalakshmi Bodepudi
  • PROCESS FOR PREPARING LACIDIPINE
    Publication number: 20070043088
    Abstract: A process for preparing lacidipine, comprising reacting a t-butoxy carbonyl methyl aryl phosphonium halide with o-phthalaldehyde, and further reacting a product comprising (E)-3-(2-formylphenyl)-2-propenoic acid, 1,1-dimethyl ethyl ester, without isolation, with ethyl-3-amino crotonate.
    Type: Application
    Filed: August 15, 2006
    Publication date: February 22, 2007
    Inventors: Eswaraiah Sajja, Venkata Naga Kali Vara Prasada Vetukuri, Srinivas Ningam, Ravindra Vedantham