Patents by Inventor Vigneshwara Ravisankar

Vigneshwara Ravisankar 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 preparation of 9-hydroxy-3-(2-chloroethyl)-2-methyl-4H-pyrido[1,2-A]pyrimidin-4-one hydrochloride
    Patent number: 8071767
    Abstract: Described herein is an improved, commercially viable and industrially advantageous process for the preparation of paliperidone intermediate 9-hydroxy-3-(2-chloroethyl)-2-methyl-4h-pyrido[1,2-a]pyrimidin-4-one and its hydrochloride salt. The process provides the paliperidone intermediate in higher yield and reduced reaction time compared to the previously disclosed processes, thereby providing for production of paliperidone and its pharmaceutically acceptable acid addition salts in high purity and in high yield.
    Type: Grant
    Filed: January 8, 2008
    Date of Patent: December 6, 2011
    Assignee: Actavis Group PTC EHF
    Inventors: Uday Rajaram Bapat, Munusamy Jayamani, Sivaji Ravisaravanan, Vigneshwara Ravisankar
  • PROCESS FOR PREPARATION OF 9-HYDROXY-3-(2-CHLOROETHYL)-2-METHYL-4H-PYRIDO[1,2-A]PYRIMIDIN-4-ONE HYDROCHLORIDE
    Publication number: 20100004447
    Abstract: Described herein is an improved, commercially viable and industrially advantageous process for the preparation of paliperidone intermediate 9-hydroxy-3-(2-chloroethyl)-2-methyl-4h-pyrido[1,2-a]pyrimidin-4-one and its hydrochloride salt. The process provides the paliperidone intermediate in higher yield and reduced reaction time compared to the previously disclosed processes, thereby providing for production of paliperidone and its pharmaceutically acceptable acid addition salts in high purity and in high yield.
    Type: Application
    Filed: January 8, 2008
    Publication date: January 7, 2010
    Applicant: ACTAVIS GROUP PTC EHF
    Inventors: Uday Rajaram Bapat, Munusamy Jayamani, Sivaji Ravisaravanan, Vigneshwara Ravisankar
  • Paliperidone Polymorphs
    Publication number: 20090061005
    Abstract: Described herein are novel polymorphic forms of paliperidone, processes for preparing the novel forms and use thereof. Also provided are processes for the preparation of novel polymorphic forms of paliperidone and the use thereof in the preparation of pharmaceutical compositions.
    Type: Application
    Filed: August 20, 2008
    Publication date: March 5, 2009
    Applicant: ACTAVIS GROUP PTC EHF
    Inventors: Uday Rajaram Bapat, Jayamani Munusamy, Sivaji Ravisaravanan, Vigneshwara Ravisankar, Jon Valgeirsson