Patents by Inventor Chandrasekaran Ramasubbu

Chandrasekaran Ramasubbu 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).

  • PROCESS FOR THE PREPARATION OF GEMIFLOXACIN
    Publication number: 20100076193
    Abstract: The present invention relates to an improved process for the preparation of Gemifloxacin mesylate of formula (V). The present invention further provides novel intermediates of formula (II) and (IV), which are useful intermediates for the preparation of Gemifloxacin mesylate of formula (V). wherein R1 is linear or branched chain alkyl group having 1-3 carbon atoms.
    Type: Application
    Filed: October 31, 2007
    Publication date: March 25, 2010
    Inventors: Chandrasekaran Ramasubbu, Suresh Ramasamy, Kiranmye Tayyala, Mahender Rao Siripragada
  • Amorphous hydrate of a cephalosporin antibiotic
    Patent number: 7244842
    Abstract: A process for the preparation of cefdinir of the formula (I) the said process comprising the steps of: i) condensing 7-amino-3-cephem-4-carboxylic acid of the formula (XII) wherein R1 is as defined above with compound of the formula (XIII) in the presence of a tertiary amine and an organic solvent, followed by treatment with a base to produce a salt of compound formula (XIV), wherein M+ is a counter ion and ii) hydrolyzing the compound of the formula (XIV) using an acid in the presence of a solvent to produce cefdinir of formula (I).
    Type: Grant
    Filed: November 10, 2003
    Date of Patent: July 17, 2007
    Assignee: Orchid Chemicals & Pharmaceuticals Ltd.
    Inventors: Pandurang Balwant Desphande, Bhausaheb Pandharinath Khadangale, Chandrasekaran Ramasubbu
  • Novel amorphous hydrate of a cephalosporin antibiotic
    Publication number: 20060094703
    Abstract: A process for the preparation of cefdinir of the formula (I) the said process comprising the steps of: i) condensing 7-amino-3-cephem-4-carboxylic acid of the formula (XII) wherein R1 is as defined above with compound of the formula (XIII) in the presence of a tertiary amine and an organic solvent, followed by treatment with a base to produce a salt of compound formula (XIV), wherein M+ is a counter ion and ii) hydrolyzing the compound of the formula (XIV) using an acid in the presence of a solvent to produce cefdinir of formula (I).
    Type: Application
    Filed: November 10, 2003
    Publication date: May 4, 2006
    Applicant: Orchid Chemicals and Pharmaceuticals Ltd.
    Inventors: Pandurang Deshpande, Bhausaheb Khadangale, Chandrasekaran Ramasubbu