Patents by Inventor Pushpa Narayanan

Pushpa Narayanan 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).

  • Methods for producing and purifying 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine monomers and polycarbonates derived therefrom
    Patent number: 7592464
    Abstract: Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 99 weight percent phenolphthalein, based on the total weight of the phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is purified by a combination of techniques to produce a solid comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine with sufficient purity to be used as a monomer in the synthesis of clear polymers.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: September 22, 2009
    Assignee: SABIC Innovative Plastics IP BV
    Inventors: Rajshekhar Basale, Hyacinth Mary Bastian, Balakrishnan Ganesan, Venkata Rama Narayanan Ganapathy Bhotla, Gurram Kishan, Pushpa Narayanan, Swaminathan Shubashree, Ravindra Vikram Singh
  • Process for the purification of dihydric phenols
    Patent number: 7541417
    Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, filtering the adsorbent material to form a solution B, adding an anti-solvent to the solution B to form a solution C, and distilling the solution C, wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value of 1 to 4.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: June 2, 2009
    Assignee: SABIC Innovative Plastics IP B.V.
    Inventors: Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan, Ramanarayanan GV, Arun Dixit, Pradeep Nadkarni, Jan Plen Lens
  • Method of purification of dihydric phenols
    Patent number: 7528210
    Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: May 5, 2009
    Assignee: SABIC Innovative Plastics IP B.V.
    Inventors: Guohua Xiu, Tong Sun, Jan Plen Lens, Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan
  • METHODS FOR PRODUCING AND PURIFYING 2-HYDROCARBYL-3,3-BIS(4-HYDROXYARYL)PHTHALIMIDINE MONOMERS AND POLYCARBONATES DERIVED THEREFROM
    Publication number: 20080242873
    Abstract: Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 99 weight percent phenolphthalein, based on the total weight of the phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is purified by a combination of techniques to produce a solid comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine with sufficient purity to be used as a monomer in the synthesis of clear polymers.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Rajshekhar Basale, Hyacinth Mary Bastian, Balakrishnan Ganesan, Venkata Rama Narayana Ganapathy Bhotla, Gurram Kishan, Pushpa Narayanan, Swaminathan Shubashree, Ravindra Vikram Singh
  • METHOD OF PURIFICATION OF DIHYDRIC PHENOLS
    Publication number: 20070232774
    Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.
    Type: Application
    Filed: March 30, 2006
    Publication date: October 4, 2007
    Applicant: General Electric Company
    Inventors: Guohua Xiu, Tong Sun, Jan Lens, Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan
  • PROCESS FOR THE PURIFICATION OF DIHYDRIC PHENOLS
    Publication number: 20070232775
    Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, filtering the adsorbent material to form a solution B, adding an anti-solvent to the solution B to form a solution C, and distilling the solution C, wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value of 1 to 4.
    Type: Application
    Filed: March 30, 2006
    Publication date: October 4, 2007
    Applicant: General Electric Company
    Inventors: Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan, Ramanarayanan GV, Arun Dixit, Pradeep Nadkarni, Jan Lens