Patents by Inventor Choi Wonmun

Choi Wonmun 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).

  • Method for production of cyclic polysulfide compound and rubber composition containing the same
    Patent number: 6984711
    Abstract: A method of production of a cyclic polysulfide having the formula (I): wherein x is an integer of 2 to 6, n is an integer of 1 to 15, and R indicates a substituted or unsubstituted C2 to C18 alkylene group or a substituted or unsubstituted C2 to C18 alkylene group including an oxyalkylene group comprising: reacting a dihalogen compound of the formula X—R—X wherein, X independently indicates a halogen atom, and R indicates a substituted or unsubstituted C2 to C18 alkylene group or a substituted or unsubstituted C2 to C18 alkylene group including an oxyalkylene group and an alkali metal polysulfide of the formula M2Sx wherein, M is an alkali metal and x is an integer of 2 to 6, by a two-phase system in an incompatible mixed solvent of a hydrophilic and lypophilic solvent.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: January 10, 2006
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Choi Wonmun, Kazunori Ishikawa
  • Rubber composition containing cyclic polysulfide vulcanization agent
    Publication number: 20050199854
    Abstract: A method of production of a cyclic polysulfide having the formula (I): wherein x is an integer of 2 to 6, n is an integer of 1 to 15, and R indicates a substituted or unsubstituted C2 to C18 alkylene group or a substituted or unsubstituted C2 to C18 alkylene group including an oxyalkylene group comprising: reacting a dihalogen compound of the formula X—R—X wherein, X independently indicates a halogen atom, and R indicates a substituted or unsubstituted C2 to C18 alkylene group or a substituted or unsubstituted C2 to C18 alkylene group including an oxyalkylene group and an alkali metal polysulfide of the formula M2Sx wherein, M is an alkali metal and x is an integer of 2 to 6, by a two-phase system in an incompatible mixed solvent of a hydrophilic and lypophilic solvent.
    Type: Application
    Filed: May 11, 2005
    Publication date: September 15, 2005
    Inventors: Choi Wonmun, Kazunori Ishikawa
  • Method for production of cyclic polysulfide compound and rubber composition containing the same
    Publication number: 20020107338
    Abstract: A method of production of a cyclic polysulfide having the formula (I): 1
    Type: Application
    Filed: November 27, 2001
    Publication date: August 8, 2002
    Applicant: THE YOKOHAMA RUBBER CO., LTD
    Inventors: Choi Wonmun, Kazunori Ishikawa