Patents by Inventor Purna Ray

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
  • Process for the preparation of ganciclovir
    Publication number: 20060142574
    Abstract: The present invention relates to a process for the preparation of N2-Acetyl-9-(1,3-diace-toxy-2-propoxymethyl) guanine, referred to here as N-9 alkylated isomer of structural formula I, and to the use of this compound as an intermediate for the preparation of antiviral compound, ganciclovir.
    Type: Application
    Filed: October 31, 2003
    Publication date: June 29, 2006
    Inventors: Jayachandra Babu, Purna Ray, Chandra Khanduri, Yatendra Kumar
  • Process for the preparation of repaglinide
    Publication number: 20050107614
    Abstract: The present invention relates to a cost effective and industrially advantageous process for the preparation of repaglinide.
    Type: Application
    Filed: September 24, 2002
    Publication date: May 19, 2005
    Inventors: Purna Ray, Jayachandra Babu, Mohammad Salman
  • Process for the preparation of beta-ionylideneacetaldehyde
    Publication number: 20050027143
    Abstract: The present invention relates to an industrially advantageous process for the preparation of beta-ionylidencacetaldehyde of structural Formula I, which is a key intermediate for the synthesis of vitamin A and related compounds such as tretinoin and isotretinoin.
    Type: Application
    Filed: August 23, 2002
    Publication date: February 3, 2005
    Inventors: Mohammad Salman, Purna Ray, Suresh Babu, Naresh Kumar