Patents by Inventor Rajesh Kumar Ramchandra Pawar

Rajesh Kumar Ramchandra Pawar 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).

  • Method for manufacture of ceftiofur
    Patent number: 7511135
    Abstract: A process for preparation of ceftiofur of formula (I) having purity greater than 97% is disclosed.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: March 31, 2009
    Assignee: Lupin Limited
    Inventors: Om Dutt Tyagi, Santosh Kumar Richhariya, Rajesh Kumar Ramchandra Pawar, Yuvaraj Atmaram Chavan
  • Method for manufacture of ceftiofur
    Publication number: 20080207912
    Abstract: A process for preparation of ceftiofur of formula (I) of high purity and substantially free from impurities is disclosed.
    Type: Application
    Filed: April 30, 2008
    Publication date: August 28, 2008
    Inventors: Om Dutt Tyagi, Santosh Kumar Richhariya, Rajesh Kumar Ramchandra Pawar, Yuvaraj Atmaram Chavan
  • Method for preparation of ceftiofur and salts thereof
    Patent number: 7335767
    Abstract: A process for preparation of ceftiofur sodium of formula (Ib) possessing high stability and having purity of more than 97% and substantially free of impurities, is disclosed. The process comprises: i) reacting cefotaxime or its salts or its esters of formula (VI) wherein R3 is hydrogen, an alkali or alkaline earth metal, or an easily hydrolysable ester, with thiofuroic acid, employed in a molar proportion of 1.5 to 3.0 moles per mole of compound (VI), in the presence of acetonitrile as solvent and in the presence of large excess of methanesulfonic acid, employed in molar proportions of 12 to 18 moles per mole of compound (VI), and at a temperature of between ?5° C. to 30° C.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: February 26, 2008
    Assignee: Lupin Limited
    Inventors: Om Dutt Tyagi, Santosh Kumar Richhariya, Rajesh Kumar Ramchandra Pawar
  • Method for preparation of ceftiofur and salts thereof
    Publication number: 20040132996
    Abstract: A process for preparation of ceftiofur sodium of formula (Ib) 1
    Type: Application
    Filed: October 27, 2003
    Publication date: July 8, 2004
    Applicant: LUPIN LIMITED
    Inventors: Om Dutt Tyagi, Santosh Kumar Richhariya, Rajesh Kumar Ramchandra Pawar