Patents by Inventor Chandra Purna Ray

Chandra Purna Ray 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).

  • CONVERSION OF AROMATIC DIAZONIUM SALT TO ARYL HYDRAZINE
    Publication number: 20110313171
    Abstract: The present invention relates to the preparation of aryl hydrazines and their salts by treating aryl diazonium salts with triphenyl phosphine followed by hydrolysis of the resulting triphenyl-aryl hydrazyl phosphonium salt to get aryl hydrazine or its salt.
    Type: Application
    Filed: January 12, 2007
    Publication date: December 22, 2011
    Inventors: Chandra Purna Ray, Sreekanth Medikonduri, Gorantla Seeta Ramanjaneyulu
  • CRYSTALLINE OXYBUTYNIN AND PROCESS FOR PREPARING THE SAME
    Publication number: 20110087042
    Abstract: The present invention relates to a crystalline oxybutynin base and process for preparing the same. Further, this invention discloses a process for preparing an acid addition salt of oxybutynin employing the crystalline oxybutynin base.
    Type: Application
    Filed: February 4, 2009
    Publication date: April 14, 2011
    Applicant: MATRIX LABORATORIES LIMITED
    Inventors: Chandra Purna Ray, Madhuresh Sethi, Sanjay Mahajan, Om Dutt Tyagi