Patents by Inventor Palaniappan Srinivasan

Palaniappan Srinivasan 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).

  • Substituted dihydropyrimidinone preparation using polyaniline salt catalyst
    Patent number: 7232905
    Abstract: The present invention provides a process for the preparation of substituted dihydropyrimidinones using polyaniline salts as reusable catalysts, which comprises reacting an aldehyde, a ?-keto ester and urea/thiourea in the presence of a polyaniline salt catalyst and separating the substituted dihydropyrimidinone obtained.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: June 19, 2007
    Assignee: Council of Scientific and Industrial Research
    Inventors: Palaniappan Srinivasan, Vaidya J. Rao, Gangadasu Banda
  • Process for preparing alkylated dihydroxybenzene
    Patent number: 7112705
    Abstract: The present invention relates to a process for the preparation of alkylated dihydroxybenzene by alkylating dihydroxy benzene with tertiary butyl alcohol in the presence of a solid acid/solid polymer catalyst.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: September 26, 2006
    Assignee: Council of Scientific and Industrial Research
    Inventors: Narayanan Sankarasubbier, Palaniappan Srinivasan, Katravulapalli Veera Venkata Satya Bhaskara Sita Rama Murthy
  • Substituted dihydropyrimidinone preparation using polyaniline salt catalyst
    Publication number: 20050215790
    Abstract: The present invention provides a process for the preparation of substituted dihydropyrimidinones using polyaniline salts as reusable catalysts, which comprises reacting an aldehyde, a ?-keto ester and urea/thiourea in the presence of a polyaniline salt catalyst and separating the substituted dihydropyrimidinone obtained.
    Type: Application
    Filed: March 26, 2004
    Publication date: September 29, 2005
    Applicant: Council of Scientific and Industrial Research
    Inventors: Palaniappan Srinivasan, Vaidya Rao, Gangadasu Banda
  • Process for preparing substituted coumarins
    Patent number: 6716996
    Abstract: The present invention relates to a process for preparing substituted coumarins. More particularly, the present invention relates to a process for preparing substituted coumarins using polyaniline salts as catalysts.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: April 6, 2004
    Assignee: Council of Scientific and Industrial Research
    Inventors: Palaniappan Srinivasan, Vaidya Jayathirtha Rao, Saravanan Chandrasekaran, Chandrashekar Rampally
  • Process for preparing alkylated dihydroxybenzene
    Publication number: 20030125586
    Abstract: The present invention relates to a process for the preparation of alkylated dihydroxybenzene by alkylating dihydroxy benzene with tertiary butyl alcohol in the presence of a solid acid/solid polymer catalyst.
    Type: Application
    Filed: December 26, 2001
    Publication date: July 3, 2003
    Inventors: Narayanan Sankarasubbier, Palaniappan Srinivasan, Katravulapalli Veera Venkata Satya Bhaskara Sita Rama Murthy
  • Process for preparation of an ester using a polyaniline salt as catalyst
    Patent number: 6350896
    Abstract: The invention relates to a process for preparation of an ester using a polyaniline salt as catalyst.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: February 26, 2002
    Assignee: Council of Scientific & Industrial Research
    Inventors: Palaniappan Srinivasan, Sairam Malladi