Patents by Inventor Swaminathan Sivaram

Swaminathan Sivaram 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).

  • Publication number: 20180022681
    Abstract: The present invention relates to a novel process for the preparation of a linear monomer alkyl lactyl lactate by a simple esterification reaction of acid with ester in presence of suitable catalysts or reagents. The present invention further relates to a process for the preparation of poly acid from alkyl lactyl lactate by using suitable catalyst.
    Type: Application
    Filed: January 29, 2016
    Publication date: January 25, 2018
    Inventors: Yogesh Ramesh Nevare, Susheela Bhaskar Idage, Bhaskar Bhairavnath Idage, Swaminathan Sivaram
  • Patent number: 8722071
    Abstract: The present invention provides polymer microcapsules of biocide, useful for preparing coating materials such as interior and exterior paints, which comprises of an active agent biocide and an encapsulating polymer. Microcapsules described in this invention are prepared by dispersing an organic phase containing an active agent either in dissolved state or dispersed state in a polymer solution using a low boiling point solvent, in an aqueous phase containing an emulsifying agent; agitating the emulsion at 800-1200 resolution per minute for 3-5 hours at 25 -27° C. to evaporate the low boiling point solvent and thus to permit the formation of the microcapsules; separating the microcapsules, washing with water and drying the microcapsules at temperature between 25-35° C.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: May 13, 2014
    Assignee: Council of Scientific & Industrial Research
    Inventors: Shukla Parshuram Gajanan, Swaminathan Sivaram
  • 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
  • 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
  • Publication number: 20070191527
    Abstract: The present invention provides a polymer-phyllosilicate nanocomposite composition comprising (a) 10-99.95% by weight of a matrix polymer and (b) 0.05-90% by weight of a phyllosilicate selected from the group consisting of hydrophilic synthetic phyllosilicates and natural phyllosilicates intercalated with a modifier, an alkylonium ion having reactive moiety. The phyllosilicate is substantially homogeneously dispersed and/or exfoliated throughout the polymer matrix as nanosized particles and the alkylonium ion is substantially covalently linked to the matrix polymer chains. The present invention further provides a process for the preparation of polymer-phyllosilicate nanocomposite.
    Type: Application
    Filed: January 19, 2007
    Publication date: August 16, 2007
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Shroff Rama Mallikarjuna, Swaminathan Sivaram
  • Publication number: 20070191606
    Abstract: The present invention provides novel 2,2-bis(4-hydroxyphenyl)-alkyl onium salts as illustrated by 2,2-bis(4-hydroxyphenyl)-tridecyl(1,2-dimethylimidazolium)bromide and a process for preparation thereof by hydroxyalkylating acetoacetate to the corresponding hyroxyalkylacetoacetate, dealkoxycarbonylating the hydroxyalkyl acetoacetate to ?-hydroxyalkan-2-one and contacting the ?-hydroxyalkan-2-one with phenol in the presence of an acidic catalyst to give 2,2-bis(4-hydroxyphenyl)alkanol, brominating the 2,2-bis(4-hydroxyphenyl)alkanol to 2,2-bis(4-hydroxyphenyl)alkyl bromide, quaternizing 1,2-dimethylimidazole with the 2,2-bis(4-hydroxyphenyl)alkyl bromide to 2,2-bis(4-hydroxyphenyl)alkyl(1,2-dimethylimidazolium)bromide. The products can be used as reactive modifiers for layered phyllosilicates that can be used in the preparation of polymer-nanocomposites, wherein the said polymers are prepared from 2,2-bis(4-hydroxyphenyl)propane as one of the reacting monomers.
    Type: Application
    Filed: October 13, 2006
    Publication date: August 16, 2007
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Shroff Rama Mallikarjuna, Swaminathan Sivaram
  • Patent number: 7244777
    Abstract: The present invention provides nucleated polyolefins using shellac based nucleating agents wherein the nucleated polyolefins obtained have improved crystallization temperature (Tc) and smaller spherulitic size and hence improved transparency characteristics.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: July 17, 2007
    Assignee: Council of Scientific and Industrial Research
    Inventors: Subhash Pundlik Vernekar, Ramesh Chellaswamy, Swaminathan Sivaram
  • Publication number: 20070053950
    Abstract: The invention provides composition comprising microcapsules containing biocides for coating material such as paint. The invention describes composition of microcapsules containing biocides, especially Irgarol (algaecide) and Zinc Pyrithione (fungicide) and coating material such as paint to increase the life of coating material from the attack of algae and fungi respectively. The invention demonstrates that microcapsules containing biocide dispersed in paint show 0 to 3% reduction in inhibition zone where as un-encapsulated biocide show 20-22% reduction in inhibition zone when analyzed by filter paper assay thus indicating extended duration of biocidal activity with microencapsulated biocide.
    Type: Application
    Filed: February 24, 2006
    Publication date: March 8, 2007
    Inventors: Shukla Gajanan, Swaminathan Sivaram, Ahmad Absar
  • Publication number: 20060251688
    Abstract: The invention provides polyurethane microcapsules containing biocide, useful for preparing coating materials such as interior and exterior paints. Microcapsules described in this invention are prepared by dispersing biocide in an aliphatic hydrocarbon medium containing nonionic polymeric stabilizer having hydrophilic and hydrophobic repeating units, diol or polyol having molecular weight 200-2000, crosslinker and a catalyst selected from amino or organometallic compounds; adding an isocyanate drop wise to this dispersion; agitating the mixture at 800-1000 rotations per minute for the first 3-5 hours at 40-50° C. and then at 12-15 hours at 20-27° C.; to permit the formation of polyurethane microcapsules; filtering and washing the microcapsules with lower aliphatic hydrocarbon and drying the microcapsules under vacuum at temperature between 20-35° C.
    Type: Application
    Filed: February 15, 2006
    Publication date: November 9, 2006
    Inventors: Shukla Gajanan, Swaminathan Sivaram
  • Publication number: 20060246144
    Abstract: The present invention provides polymer microcapsules of biocide, useful for preparing coating materials such as interior and exterior paints, which comprises of an active agent biocide and an encapsulating polymer. Microcapsules described in this invention are prepared by dispersing an organic phase containing an active agent either in dissolved state or dispersed state in a polymer solution using a low boiling point solvent, in an aqueous phase containing an emulsifying agent; agitating the emulsion at 800-1200 resolution per minute for 3-5 hours at 25-27° C. to evaporate the low boiling point solvent and thus to permit the formation of the microcapsules; separating the microcapsules, washing with water and drying the microcapsules at temperature between 25-35° C.
    Type: Application
    Filed: February 27, 2006
    Publication date: November 2, 2006
    Inventors: Shukla Gajanan, Swaminathan Sivaram
  • 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
  • Patent number: 6451957
    Abstract: Hydroxyarylalkenes, particularly the ones constituting cashew nut shell liquid, are converted to (hydroxyalkyl)phenols, particularly 3-(8-hydroxy-noctyl)phenol, by ozonolysis followed by reduction, preferably with a hydride such as sodium borohydride. No protective acylation of the hydroxyarylalkenes is necessary. The resulting (hydroxyalkyl)phenols are useful for the preparation of polycarbonates.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: September 17, 2002
    Assignee: General Electric Company
    Inventors: Anjanikumar Jyotiprasad Varma, Swaminathan Sivaram
  • Patent number: 6333394
    Abstract: Copolycarbonates containing such structural units as birefringence-reducing or “soft block” units are prepared by conducting a reaction, such as melt polymerization or equilibration, between a precursor polycarbonate and a monomer, polycarbonate oligomer or high molecular weight polycarbonate which is a source of other structural units. The crystallinity of the resulting precursor copolycarbonate or one of the reagents employed in its preparation is enhanced and the precursor copolycarbonate is subjected to solid state polymerization.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: December 25, 2001
    Assignee: General Electric Company
    Inventors: Christian Maria Emile Bailly, Bhaskar Bhairavnath Idage, Swaminathan Sivaram, Nayaku Nivarati Chavan, Rein Mollerus Faber, Shamal Karunakaran Menon, Gautam Chatterjee, Godavarthi Satyana Varadarajan, James Day, Patrick Joseph McCloskey, Joseph Anthony King, Jr., Arun Savalaram Jadhav
  • Patent number: 6255439
    Abstract: 1,1 -Bis(4-hydroxyphenyl)-3-alkylcyclohexanes, as illustrated by 1,1-bis (4-hydroxyphenyl)-3-pentadecylcyclohexane, are prepared by hydrogenating a composition comprising 3-alkylphenols to the corresponding cyclohexanol, oxidizing the cyclohexanol to a cyclohexanone and contacting the cyclohexanone with phenol in the presence of an acidic catalyst. The preferred 3-alkylphenols are those derived from cashew nut shell liquid. The products can be used to prepare polycarbonates.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: July 3, 2001
    Assignee: General Electric Company
    Inventors: Chilukuri Ver Avadhani, Prakash Purushottam Wadgaonkar, Swaminathan Sivaram
  • Patent number: 6239213
    Abstract: This invention relates to the process for the preparation of aqueous polyurethane dispersions, which comprises preparing an isocynate terminated carboxyl group containing prepolymer, by preparing a solution of a polyol in an organic solvent, adding an ionic group containing compound to this solution, heating this mixture at a controlled temperature, adding an isocyanate in the reaction mixtute optionally in the presence of a catalyst depending upon the isocynate, stirring, neutralizing and cooling the mixture at ambient temperatures and finally dispersing the mixture in water to obtain the product.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: May 29, 2001
    Assignee: Council of Scientific & Industrial Research
    Inventors: Lalgudi Srinivasan Ramanathan, Kundalik Ganpat Raut, Subagiri Ramaswamyiyengar Srinivasan, Swaminathan Sivaram
  • Patent number: 6222002
    Abstract: Polycarbonate oligomers are prepared by oxidative carbonylation of a dihydroxyaromatic compound such as bisphenol A in the presence of a catalyst comprising a Group VIII metal such as palladium, an inorganic and/or an organic co-catalyst, a halide source and an alcohol-free solvent comprising at least one liquid aromatic hydrocarbon, optionally in combination with a dipolar aprotic liquid such as N-methylpyrrolidinone. These oligomers may be further polymerized by melt polymerization to precursor polycarbonate oligomers which may be converted to high molecular weight polycarbonates by melt or solid state polymerization.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: April 24, 2001
    Assignee: General Electric Company
    Inventors: Raghunath Vitthal Chaudhari, Ashutosh Anant Kelkar, Sunil Purushottam Gupte, Bhalchandra Mahadeo Bhanage, Mohammed Shadbar Qureshi, Bahram Moasser, Eric James Pressman, Swaminathan Sivaram, Chilukuri Ver Avadhani, Subbareddiar Kanagasabapathy
  • Patent number: 6187882
    Abstract: The invention relates to a process for the polymerization of olefins, which comprises polymerizing an olefin or mixture thereof in presence of a solvent, a supported metallocene and an aluminoxane as cocatalyst in a hydrocarbon medium, at a temperature in the range of 50 to 150° C., at a pressure ranging between 1 to 20 bar, for a period of 10 minutes to 10 hours, scavenging the reaction mixture by addition of an organoaluminum compound to remove the last traces of impurities of solvent, separating the polymer by conventional methods like precipitating, filtering, washing the polymer with an organic solvent, drying the polymer to remove the solvent to obtain the product.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: February 13, 2001
    Assignee: Council of Scientific & Industrial Research
    Inventors: Soumen Sensarma, Swaminathan Sivaram
  • Patent number: 6150493
    Abstract: The invention relates to a process for the preparation of poly (ester-carbonate)s from the corresponding oligomers, using solid state polymerization process, which comprises mixing the desired oligomers in a suitable solvent or non-solvent, adding a suitable catalyst to this mixture, refluxing the mixture for a period of 1 to 8 hours, removing the solvent by known methods, polymerization the oligomer mixture in the solid state either in presence of vacuum or under a flow of inn gas at a temperature ranging between 180-240.degree. C. for a period of 5 to 20 hours to obtain the product.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: November 21, 2000
    Assignee: General Electric Company
    Inventors: Sukhendu B. Hait, Swaminathan Sivaram
  • Patent number: 6123988
    Abstract: This invention relates to the process for the preparation of polyurethane with controlled particle size and shape. More, particularly it relates to the production of polyurethane microspheres from a diol and diisocyanate by dispersion polymerization in presence of a steric stabilizer and a catalyst in an organic solvent at a controlled temperature, and finally separating the spherical polyurethane particles from the reaction mixture by conventional means.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: September 26, 2000
    Assignee: Council of Scientific & Industrial Research
    Inventors: Lalgudi Srinivasan Ramanathan, Swaminathan Sivaram
  • Patent number: 6096678
    Abstract: A process for the preparation of an inert oxide supported metal halide organo aluminium compound catalyst. The catalyst is obtained by reacting an activated support having surface hydroxyl groups with aluminium chloride selected from aluminium chloride solution and aluminium chloride vapors. A solution of an aluminium alkyl is added to the reacted support. The solvent is removed and the reacted support is dried.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: August 1, 2000
    Inventors: Sabyasachi Sinha Ray, Rakesh Sarin, Deepak Kumar Tuli, Madan Mohan Rai, Sobhan Ghosh, Akhilesh Kumar Bhatnagar, Swaminathan Sivaram, Thekke Pangil Mohandas, Dattatraya Haribhau Gholap, Mallinamadugu Jogimarappa Gari Yanjarappa