Patents by Inventor Parma Chandra Ray

Parma Chandra 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).

  • Cost effective method for selective methylation of erythromycin A derivatives
    Patent number: 6900296
    Abstract: The invention relates to a cost effective and industrially advantageous process for the selective methylation of a hydroxy group at the 6 position of erythromycin A derivative which comprised methylating the erythromycin A derivative with a methylating agent in a mixture of toluene and a ploar aprotic solvent.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: May 31, 2005
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Mohammad Salman, Parma Chandra Ray, Kiran Kumar Gangakhedkar, Harish Niranjan Lal Dorwal, Naresh Kumar
  • Cost effective method for selective methylation of erythromycin a derivatives
    Publication number: 20040010128
    Abstract: The present invention relates to a cost effective and industrially advantageous process for the selective methylation of a hydroxy group at the 6 position of erythromycin A derivatives.
    Type: Application
    Filed: July 3, 2003
    Publication date: January 15, 2004
    Inventors: Mohammad Salman, Parma Chandra Ray, Kiran Kumar Gakhedkar, Harish Niranjan Dorwal, Naresh Kumar