Patents by Inventor Gunjan Pathak

Gunjan Pathak 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).

  • Tramadol recovery process
    Publication number: 20070112074
    Abstract: A process for the resolution of isomeric tramadol mixtures comprising: providing a purification stock comprising both cis and trans tramadol; contacting the purification stock with an acid under conditions effective to form an acid salt of the cis and trans tramadol in the purification stock; and separating the cis tramadol acid salt from the trans tramadol to obtain a purified cis tramadol acid salt; and optionally converting the cis tramadol acid salt to cis tramadol or to a pharmaceutically active salt thereof.
    Type: Application
    Filed: November 13, 2006
    Publication date: May 17, 2007
    Inventors: Ashok Kumar, Suneel Dike, Satish Soudagar, Chirag Shah, Sandeep Burudkar, Prashant Gautam, Byju Thankachen, Ashvini Saxena, Manavalan Saravanan, Gunjan Pathak, Virendra Pal, Rahul Karde, Jaysingh Gehlot
  • Process for the preparation of carvedilol and its salts
    Publication number: 20070027202
    Abstract: Disclosed herein is a process for preparation of carvedilol substantially free from its bis-impurity comprises the reaction of 4-(2,3-epoxypropoxy)carbazole and 2-(2-methoxyphenoxy)ethylamine in a polar aprotic solvent media; followed by isolation of carvediol from the reaction mass as an acid addition salt and subsequent conversion into pure carvedilol.
    Type: Application
    Filed: July 5, 2006
    Publication date: February 1, 2007
    Inventors: Ashok Kumar, Ashvini Saxena, Anindya Battacharyya, Amit Sengar, Gunjan Pathak, Satish Soudagar, Pramil Mathur, Avinash Nijasure, Sanjukumar Salunke, Prashant Gautam, Thakur Ramsingh, Dilip Jadhav