Patents by Inventor Om Tyagi

Om Tyagi 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).

  • Novel Method for the Preparation of Aryl Piperazinyl-Heterocyclic Compounds
    Publication number: 20070238877
    Abstract: A novel method for preparing a compound of formula I which comprises of coupling the piperazine derivative of formula II with alkyl halide containing compound of the formula III by heating in solvent free conditions or, optionally, in a minimum quantity of non-aqueous suspending liquid, in presence of a catalyst and a neutralizing agent to neutralize the hydrohalic acid.
    Type: Application
    Filed: June 16, 2005
    Publication date: October 11, 2007
    Applicant: Lupin Limited
    Inventors: Om Tyagi, Tushar Srivastava, Yogendra Chauhan, Vasanth Nalam
  • Process for preparation of 7-[a-amino (4-hydroxyphenyl) acetamido]-3-substituted-3-cephem-4-carboxylic acid
    Publication number: 20060149096
    Abstract: A process for preparation of 7-[D-?-amino-?-(4-hydroxyphenyl)acetamido]-3-(1-propen-1-yl)-3-cepham-4-carboxylic acid viz. Cefprozil of formula (I) igh purity, substantially free of impurities, which comprises preparation of mixed acid anhydride by selecting the sequence and temperature of addition of the reagents and its subsequent condensation with a protected 7-APCA; followed by hydrolysis, isolation and purification to give Cefprozil of formula (I) in the form of a monohydrate.
    Type: Application
    Filed: February 23, 2006
    Publication date: July 6, 2006
    Applicant: Lupin Ltd.
    Inventors: Om Tyagi, Dnyandev Rane, Tushar Srivastava, Krishnarao Sirsath
  • Method for manufacture of ceftiofur
    Publication number: 20060149054
    Abstract: A process for preparation of ceftiofur of formula (I) of high purity and substantially free from impurities is disclosed.
    Type: Application
    Filed: October 27, 2003
    Publication date: July 6, 2006
    Applicant: LUPIN LIMITED
    Inventors: Om Tyagi, Santosh Richhariya, Rajesh Pawar, Yuvaraj Chavan
  • Process for the preparation of cilastatin
    Publication number: 20050119346
    Abstract: The present invention relates to an efficient and industrially advantageous process for the preparation of pure cilastatin.
    Type: Application
    Filed: August 23, 2002
    Publication date: June 2, 2005
    Inventors: Yatendra Kumar, Om Tyagi, Tushar Srivastava, Anand Pandey
  • Process for preparation of 7-[alpha-amino (4-hydroxyphenyl) acetamido]-3-substituted-3-cephem-4-carboxylic acid
    Publication number: 20050113570
    Abstract: A process for preparation of 7-[D-?-amino-?-(4-hydroxyphenyl)acetamido]-3-(1-propen-1-yl)-3-cephem-4-carboxylic acid viz. Cefprozil of formula (I) igh purity, substantially free of impurities, which comprises preparation of mixed acid anhydride by selecting the sequence and temperature of addition of the reagents and its subsequent condensation with a protected 7-APCA; followed by hydrolysis, isolation and purification to give Cefprozil of formula (I) in the form of a monohydrate.
    Type: Application
    Filed: March 15, 2004
    Publication date: May 26, 2005
    Applicant: LUPIN LTD.
    Inventors: Om Tyagi, Dnyandev Rane, Tushar Srivastava, Krishnarao Sirsath