Patents by Inventor Jun-Chul Choi

Jun-Chul Choi 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: 20250115732
    Abstract: The present disclosure addresses the problem of providing a method for decomposing a crosslinked rubber that can improve monomer yield. The solution is a method of decomposing a crosslinked rubber that includes: a first decomposition step of pyrolyzing a crosslinked rubber containing a diene rubber at a temperature of 150° C. or more and 400° C. or less, and a second decomposition step of pyrolyzing a decomposition product obtained by the first decomposition step under an inert gas atmosphere and in the presence of a catalyst at a temperature of 300° C. or more and 950° C. or less. Preferably 80 mass % or more of the diene rubber in the crosslinked rubber is decomposed to diene oligomers having a weight-average molecular weight of 100 to 50,000 via the first decomposition step.
    Type: Application
    Filed: February 6, 2023
    Publication date: April 10, 2025
    Applicants: BRIDGESTONE CORPORATION, TOHOKU UNIVERSITY, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masahiro HOJO, Akira OKUNO, Marino KUNO, Masahiro HOMMA, Toshiaki YOSHIOKA, Shogo KUMAGAI, Norihisa FUKAYA, Satpriyo Putro WAHYU, Jun-Chul CHOI, Faried MIFTAH, Hiroshi YAMASHITA, Tadahiro FUJITANI
  • Publication number: 20250087092
    Abstract: Disclosed are a three-dimensional (3D) simulation method and a 3D simulation apparatus. The 3D simulation method disclosed herein includes a step (S20) of separating point cloud data including a road, an obstacle, and a cargo transportation route into road data and obstacle data, a step (S40) of converting the road data into road mesh data, and converting the obstacle data into obstacle mesh data, a step (S60) of constructing a virtual environment by merging the road mesh data with the obstacle mesh data, a step (S80) of loading a specific cargo transportation route to the virtual environment, a step (S100) of loading a 3D transport truck and a 3D cargo to a predetermined point of the cargo transportation route, and a step (S120) of performing a route survey simulation while virtually driving the 3D transport truck and the 3D cargo along the cargo transportation route.
    Type: Application
    Filed: December 4, 2023
    Publication date: March 13, 2025
    Applicants: SAMSUNG E&A CO., LTD., Morai Inc.
    Inventors: Jun Chul HWANG, Sung Il KIM, Yong Ho AHN, Jae Hun CHOI, Taek Sun LEE, Hwang JEON, Jun HONG, Ji Won JUNG
  • Publication number: 20230212110
    Abstract: A method for producing a carbamic acid salt, including contacting a carbon dioxide-containing mixed gas having a partial pressure of carbon dioxide of 0.001 atm or more and less than 1 atm with an amino group-containing organic compound in the presence of a base in at least one organic solvent selected from the group consisting of an organic solvent having 2 or more and 8 or less carbon atoms, and a method for producing a carbamic acid ester or a urea derivative using the carbamic acid salt.
    Type: Application
    Filed: June 3, 2021
    Publication date: July 6, 2023
    Applicants: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, TOSOH CORPORATION
    Inventors: Katsuhiko TAKEUCHI, Kazuhiro MATSUMOTO, Norihisa FUKAYA, Hiroki KOIZUMI, Jun-Chul CHOI, Masahito UCHIDA, Seiji MATSUMOTO, Satoshi HAMURA
  • Patent number: 11028106
    Abstract: An object of the present invention is to provide a method capable of producing a tetraalkoxysilane with a high energy efficiency and with a high yield. The present invention provides a method for producing a tetraalkoxysilane, the method including: a first step of reacting an alcohol with a silicon oxide; and a second step of bringing a vaporized component of the reaction mixture obtained in the first step into contact with a molecular sieve.
    Type: Grant
    Filed: December 25, 2018
    Date of Patent: June 8, 2021
    Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Norihisa Fukaya, Seong-Jib Choi, Jun-Chul Choi, Toshio Horikoshi, Sho Kataoka, Thuy Nguyen, Kazuhiko Sato, Minoru Hasegawa, Hiroshi Kumai
  • Publication number: 20200347082
    Abstract: An object of the present invention is to provide a method capable of producing a tetraalkoxysilane with a high energy efficiency and with a high yield. The present invention provides a method for producing a tetraalkoxysilane, the method including: a first step of reacting an alcohol with a silicon oxide; and a second step of bringing a vaporized component of the reaction mixture obtained in the first step into contact with a molecular sieve.
    Type: Application
    Filed: December 25, 2018
    Publication date: November 5, 2020
    Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Norihisa FUKAYA, Seong-Jib CHOI, Jun-Chul CHOI, Toshio HORIKOSHI, Sho KATAOKA, Thuy NGUYEN, Kazuhiko SATO, Minoru HASEGAWA, Hiroshi KUMAI
  • Patent number: 10752579
    Abstract: A method of production of carbamic acid ester has a high yield and high selectivity and is superior in economy. The method of production of a carbamic acid ester includes reacting an amine, carbon dioxide, and an alkoxysilane compound in the presence of a catalyst containing a zinc compound or an alkali metal compound or in the presence of an ionic liquid. A carbamic acid ester is produced, for example by reacting aniline, carbon dioxide, and tetramethoxysilane at a temperature of 150 to 180° C. in the presence of zinc acetate and 2,2?-bipyridine.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: August 25, 2020
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Jun-Chul Choi, Norihisa Fukaya, Qiao Zhang, Hiroyuki Yasuda
  • Patent number: 10738190
    Abstract: A resin composition includes: (a) a supported platinum catalyst having a structure shown by the following general formula (1) in which a platinum complex is supported on a surface of an inorganic oxide; and (b) a thermoplastic matrix resin. The resin composition is usable as an addition-reaction catalyst capable of imparting sufficient storability and quick curability to an addition-reaction curable composition. In the formula, L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound, and an isocyanide compound; and n represents the number of Ls and an integer from 0 to 2.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: August 11, 2020
    Assignees: SHIN-ETSU CHEMICAL CO., LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masayuki Ikeno, Takeshi Miyao, Takeharu Toyoshima, Jun-chul Choi, Norihisa Fukaya, Hiroyuki Yasuda
  • Publication number: 20190185420
    Abstract: A method of production of carbamic acid ester has a high yield and high selectivity and is superior in economy. The method of production of a carbamic acid ester includes reacting an amine, carbon dioxide, and an alkoxysilane compound in the presence of a catalyst containing a zinc compound or an alkali metal compound or in the presence of an ionic liquid. A carbamic acid ester is produced, for example by reacting aniline, carbon dioxide, and tetramethoxysilane at a temperature of 150 to 180° C. in the presence of zinc acetate and 2,2?-bipyridine.
    Type: Application
    Filed: August 31, 2017
    Publication date: June 20, 2019
    Inventors: Jun-Chul CHOI, Norihisa FUKAYA, Qiao ZHANG, Hiroyuki YASUDA
  • Publication number: 20190100649
    Abstract: A resin composition includes: (a) a supported platinum catalyst having a structure shown by the following general formula (1) in which a platinum complex is supported on a surface of an inorganic oxide; and (b) a thermoplastic matrix resin. The resin composition is usable as an addition-reaction catalyst capable of imparting sufficient storability and quick curability to an addition-reaction curable composition. In the formula, L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound, and an isocyanide compound; and n represents the number of Ls and an integer from 0 to 2.
    Type: Application
    Filed: February 28, 2017
    Publication date: April 4, 2019
    Applicants: SHIN-ETSU CHEMICAL CO., LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Masayuki IKENO, Takeshi MIYAO, Takeharu TOYOSHIMA, Jun-chul CHOI, Norihisa FUKAYA, Hiroyuki YASUDA
  • Patent number: 10213777
    Abstract: A metal complex represented by the following Formula (1): (wherein M represents palladium or platinum; L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound and an isocyanide compound; n represents an integer of 0 to 2 showing the number of the ligand; and each of R1 to R4 represents an organic group). The metal complex described above can be fixed on an inorganic oxide while maintaining a skeletal structure thereof to obtain a supported metal complex, and this makes it possible to allow the supported metal complex to maintain the same catalytic activity as that of the original metal complex. Also, calcining the supported metal complex obtained in the manner described above makes it possible to obtain a supported metal catalyst which is improved in catalytic activity to a greater extent than conventional supported metal catalysts.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: February 26, 2019
    Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Jun-Chul Choi, Norihisa Fukaya, Hiroyuki Yasuda
  • Patent number: 10000514
    Abstract: An object of the present invention is to provide a method for producing tetraalkoxysilane while saving energy at a high yield. Tetraalkoxysilane can be produced while saving energy at a high yield by the method including a first step of reacting alcohol with carbon dioxide in the presence of a dehydrating agent and/or in a reactor provided with a dehydrating means, and a second step of reacting a reaction mixture obtained in the first step with silicon oxide.
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: June 19, 2018
    Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Norihisa Fukaya, Seong-Jib Choi, Jun-Chul Choi, Toshio Horikoshi, Kazuhiko Sato, Hiroyuki Yasuda
  • Publication number: 20170267701
    Abstract: An object of the present invention is to provide a method for producing tetraalkoxysilane while saving energy at a high yield. Tetraalkoxysilane can be produced while saving energy at a high yield by the method including a first step of reacting alcohol with carbon dioxide in the presence of a dehydrating agent and/or in a reactor provided with a dehydrating means, and a second step of reacting a reaction mixture obtained in the first step with silicon oxide.
    Type: Application
    Filed: April 30, 2015
    Publication date: September 21, 2017
    Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Norihisa Fukaya, Seong-Jib Choi, Jun-Chul Choi, Toshio Horikoshi, Kazuhiko Sato, Hiroyuki Yasuda
  • Publication number: 20170225156
    Abstract: A metal complex represented by the following Formula (1): (wherein M represents palladium or platinum; L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound and an isocyanide compound; n represents an integer of 0 to 2 showing the number of the ligand; and each of R1 to R4 represents an organic group). The metal complex described above can be fixed on an inorganic oxide while maintaining a skeletal structure thereof to obtain a supported metal complex, and this makes it possible to allow the supported metal complex to maintain the same catalytic activity as that of the original metal complex. Also, calcining the supported metal complex obtained in the manner described above makes it possible to obtain a supported metal catalyst which is improved in catalytic activity to a greater extent than conventional supported metal catalysts.
    Type: Application
    Filed: March 2, 2017
    Publication date: August 10, 2017
    Inventors: Jun-Chul Choi, Norihisa Fukaya, Hiroyuki Yasuda
  • Patent number: 9616418
    Abstract: A metal complex represented by the following Formula (1): (wherein M represents palladium or platinum; L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound and an isocyanide compound; n represents an integer of 0 to 2 showing the number of the ligand; and each of R1 to R4 represents an organic group). The metal complex described above can be fixed on an inorganic oxide while maintaining a skeletal structure thereof to obtain a supported metal complex, which makes it possible to allow the supported metal complex to maintain the same catalytic activity as that of the original metal complex. Also, calcining the supported metal complex obtained in the manner described above makes it possible to obtain a supported metal catalyst improved in catalytic activity to a greater extent than conventional supported metal catalysts.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: April 11, 2017
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Jun-Chul Choi, Norihisa Fukaya, Hiroyuki Yasuda
  • Publication number: 20160030932
    Abstract: A metal complex represented by the following Formula (1): (wherein M represents palladium or platinum; L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound and an isocyanide compound; n represents an integer of 0 to 2 showing the number of the ligand; and each of R1 to R4 represents an organic group). The metal complex described above can be fixed on an inorganic oxide while maintaining a skeletal structure thereof to obtain a supported metal complex, which makes it possible to allow the supported metal complex to maintain the same catalytic activity as that of the original metal complex. Also, calcining the supported metal complex obtained in the manner described above makes it possible to obtain a supported metal catalyst improved in catalytic activity to a greater extent than conventional supported metal catalysts.
    Type: Application
    Filed: March 13, 2014
    Publication date: February 4, 2016
    Inventors: Jun-Chul Choi, Norihisa Fukaya, Hiroyuki Yasuda
  • Patent number: 8455690
    Abstract: The invention provides a method for producing an arylhydroxylamine compound efficiently and safely under mild conditions. The method involves contacting a nitroaryl compound with a hydrogen source in the presence of a platinum catalyst supported on amino group-coordinated silica and a poisoning agent.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: June 4, 2013
    Assignees: Wako Pure Chemical Industries, Ltd., National Institute of Advanced Industrial Science and Technology
    Inventors: Yasumasa Takenaka, Jun-Chul Choi, Toshiyasu Sakakura, Hiroyuki Yasuda, Takahiro Kiyosu
  • Publication number: 20100113830
    Abstract: Problem To provide a method for producing an arylhydroxylamine compound efficiently and safely under mild conditions. Means for Solving the Problem The present invention relates to a method for producing anarylhydroxylamine compound, which comprises contacting a nitroaryl compound with a hydrogen source in the coexistence of a platinum catalyst supported on amino group-coordinated silica and a poisoning agent.
    Type: Application
    Filed: March 27, 2008
    Publication date: May 6, 2010
    Applicant: WAKO PURE CHEMICAL INDUSTRIES, LTD.
    Inventors: Yasumasa Takenaka, Jun-Chul Choi, Toshiyasu Sakakura, Hiroyuki Yasuda, Takahiro Kiyosu
  • Publication number: 20090012324
    Abstract: Disclosed is a process for production of a carboxylic acid ester from a carboxylic acid and an olefin or production of an ether compound from an alcohol and an olefin at low cost and with high yield in an industrially advantageous manner. The process comprises the step of reacting a carboxylic acid with an olefin to yield a corresponding carboxylic acid ester or reacting an alcohol with an olefin to yield a corresponding ether compound. In the process, a catalyst comprising a combination of (i) at least one metal compound selected from an iron compound, a cobalt compound and a nickel compound and (ii) an acidic compound is used.
    Type: Application
    Filed: February 7, 2007
    Publication date: January 8, 2009
    Inventors: Jun-Chul Choi, Kazufumi Kohno, Hiroyuki Yasuda, Toshiyasu Sakakura