Patents by Inventor S. SUJITH

S. SUJITH 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).

  • Process for producing polycarbonates and a coordination complex used therefor
    Patent number: 9115161
    Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: August 25, 2015
    Assignee: SK Innovation Co., Ltd.
    Inventors: Bun Yeoul Lee, S. Sujith, Eun Kyung Noh, Jae Ki Min
  • Process for producing polycarbonates and a coordination complex used therefor
    Patent number: 8829156
    Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: September 9, 2014
    Assignee: SK Innovation Co., Ltd.
    Inventors: Bun Yeoul Lee, S. Sujith, Eun Kyung Noh, Jae Ki Min
  • PROCESS FOR PRODUCING POLYCARBONATES AND A COORDINATION COMPLEX USED THEREFOR
    Publication number: 20140249323
    Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
    Type: Application
    Filed: May 9, 2014
    Publication date: September 4, 2014
    Applicant: SK INNOVATION CO., LTD.
    Inventors: Bun Yeoul LEE, S. Sujith, Eun Kyung Noh, Jae Ki Min
  • Coordination complexes and process of producing polycarbonate by copolymerization of carbon dioxide and epoxide using the same as catalyst
    Patent number: 8791274
    Abstract: Provided are a complex prepared from ammonium salt-containing ligands and having such an equilibrium structural formula that the metal center takes a negative charge of 2 or higher, and a method for preparing polycarbonate via copolymerization of an epoxide compound and carbon dioxide using the complex as a catalyst. When the complex is used as a catalyst for copolymerizing an epoxide compound and carbon dioxide, it shows high activity and high selectivity and provides high-molecular weight polycarbonate, and thus easily applicable to commercial processes. In addition, after forming polycarbonate via carbon dioxide/epoxide copolymerization using the complex as a catalyst, the catalyst may be separately recovered from the copolymer.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: July 29, 2014
    Assignee: SK Innovation Co., Ltd.
    Inventors: Myungahn Ok, Jisu Jeong, BunYeoul Lee, S. Sujith, Anish Cyriac, JaeKi Min, JongEon Seong
  • Process for producing polycarbonates and a coordination complex used therefor
    Patent number: 8530615
    Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: September 10, 2013
    Assignee: SK Innovation Co., Ltd.
    Inventors: Bun Yeoul Lee, S. Sujith, Eun Kyung Noh, Jae Ki Min
  • PROCESS FOR PRODUCING POLYCARBONATES AND A COORDINATION COMPLEX USED THEREFOR
    Publication number: 20120226016
    Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
    Type: Application
    Filed: March 12, 2012
    Publication date: September 6, 2012
    Applicant: SK INNOVATION CO., LTD.
    Inventors: Bun Yeoul LEE, S. Sujith, Eun Kyung Noh, Jae Ki Min
  • PROCESS FOR PRODUCING POLYCARBONATES AND A COORDINATION COMPLEX USED THEREFOR
    Publication number: 20120184709
    Abstract: The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
    Type: Application
    Filed: March 30, 2012
    Publication date: July 19, 2012
    Applicant: SK INNOVATION CO., LTD.
    Inventors: Bun Yeoul LEE, S. SUJITH, Eun Kyung NOH, Jae Ki MIN