Patents by Inventor Ramesh Kumar Chidambaram

Ramesh Kumar Chidambaram 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).

  • Catalytic process for the production of 3,3?, 4,4?-tetraminobiphenyl
    Patent number: 6979749
    Abstract: This invention relates to a process for the production of 3,3?,4,4?-tetraminobiphenyl (TAB) of formula (1) from non-carcinogenic raw materials, employing Suzuki type biaryl coupling as the key step. More particularly, it relates to a three steps process for the production of TAB comprising biaryl aryl coupling of 2-nitro-4-bromoacetamide (NBA) of formula (2) catalyzed by sulfilimine based palladacycles as catalysts followed by the basic hydrolysis of acetyl group and the reduction of nitro groups with conventional reducing agents.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: December 27, 2005
    Assignee: Council of Scientific and Industrial Research
    Inventors: Sudhir Bavikar, Asif Maner, Ramesh Kumar Chidambaram, Sudalai Arumugam, Sivaram Swaminathan