Patents by Inventor Suryavanshi Gurunath

Suryavanshi Gurunath 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).

  • Reusable transition metal complex catalyst useful for the preparation of high pure quality 3,3?-diaminobenzidine and its analogues and a process thereof
    Patent number: 7999112
    Abstract: The present invention provides a reusable transition metal complex catalyst useful for the preparation of high pure quality 3,3?-diaminobenzidine and its analogues. The present invention also provides to a process for the preparation of a reusable transition metal complex catalyst. The present invention further provides a process for the preparation of 3,3?-diaminobenzidine (DAB) or 3,3?,4,4? Tetraminobiphenyl (TAB) using reusable transition metal complex catalyst. The high quality 3,3?-diaminobenzedine (DAB) and its analogues are prepared by coupling 4-halo-2-nitroaniline to 3,3?-dinitrobenzidine (DNB) using transition metals as catalysts followed by reduction of 3,3?-dinitrobenzidine to the corresponding substituted 3,3?-diaminobenzidine of formula 1 in high yields.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: August 16, 2011
    Assignee: Council of Scientific and Industrial Research
    Inventors: Ravi Kant Shukla, Lourduswamy Emmanuvel, Chidambaram Rameshkumar, Suryavanshi Gurunath, Arumugam Sudalai, Swati Shantikumar Kulkarni, Swaminathan Sivaram
  • Novel reusable transition metal complex catalyst useful for the preparation of high pure quality 3,3'-diaminobenzidine and its analogues and a process thereof
    Publication number: 20090131678
    Abstract: The present invention provides a reusable transition metal complex catalyst useful for the preparation of high pure quality 3,3?-diaminobenzidine and its analogues. The present invention also provides to a process for the preparation of a reusable transition metal complex catalyst. The present invention further provides a process for the preparation of 3,3?-diaminobenzidine (DAB) or 3,3?,4,4? Tetraminobiphenyl (TAB) using reusable transition metal complex catalyst. The high quality 3,3?-diaminobenzedine (DAB) and its analogues are prepared by coupling 4-halo-2-nitroaniline to 3,3?-dinitrobenzidine (DNB) using transition metals as catalysts followed by reduction of 3,3?-dinitrobenzidine to the corresponding substituted 3,3?-diaminobenzidine of formula 1 in high yields.
    Type: Application
    Filed: March 11, 2008
    Publication date: May 21, 2009
    Inventors: Ravi Kant Shukla, Lourduswamy Emmanuvel, Chidambaram Rameshkumar, Suryavanshi Gurunath, Arumugam Sudalai, Swati Shantikumar Kulkarni, Swaminathan Sivaram