Patents by Inventor Asif Maner

Asif Maner 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
  • NOVEL CATALYTIC PROCESS FOR THE PRODUCTION OF 3,3', 4,4'-TETRAMINOBIPHENYL
    Publication number: 20050215823
    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. sMore particularly, it relates to a three steps process for the production of TAB comprising biaryl aryl coupling of 2-nitro-4-bromoacetanilide (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: Application
    Filed: March 29, 2004
    Publication date: September 29, 2005
    Applicant: Council of Scientific and Industrial Research
    Inventors: Sudhir Bavikar, Asif Maner, Ramesh Chidambaram, Sudalai Arumugam, Sivaram Swaminathan
  • Process for the preparation of high quality 3,3?,4,4?-tetraminobiphenyl
    Patent number: 6835854
    Abstract: The present invention relates to a process for the preparation of pure high quality 3,3′, 4,4′-tetraminobiphenyl (TAB) in high yields. The present invention also discloses a process for the preparation of 3,3′,4,4′ tetraminobiphenyl (TAB) comprising a three step process: (1) oxidation 3,3′-dichloro 4,4′-diaminobiphenyl (DCB) with 50% aq. H2O2, (2) ammonolysis of the resulting 3,3′-dinitro 4,4′-dinitrobiphenyl (DCDNB) and (3) reduction of 3,3′-diamino-4,4′-dinitrobiphenyl (DADNB) with stannous chloride and concentrated hydrochloric acid.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: December 28, 2004
    Assignee: Council of Scientific and Industrial Research
    Inventors: Asif Maner, Sudhir Bavikar, Arumugam Sudalai, Swaminathan Sivaram