Patents by Inventor Kyong Ju NA

Kyong Ju NA 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).

  • Modified polyisobutylene polymer for rubber compounding and rubber composition comprising same
    Patent number: 11718691
    Abstract: The present invention relates to a modified polyisobutylene polymer for rubber compounding including polyisobutylene having isobutylene as a main chain, unsaturated dicarboxylic anhydride, and a silane compound, and more particularly, 20 to 80 wt % of polyisobutylene having isobutylene as a main chain, 1 to 20 wt % of unsaturated dicarboxylic anhydride, and 1 to 60 wt % of a silane compound. In particular, when the polyisobutylene polymer of the present invention is used as an additive for rubber, the dispersibility of a filler can be significantly increased and both grip performance and rolling resistance can be improved.
    Type: Grant
    Filed: August 10, 2020
    Date of Patent: August 8, 2023
    Assignee: DL Chemical CO., LTD.
    Inventors: Se Hyun Lee, Kyong Ju Na, Min Sup Park, Myeong Seok Kim
  • Lubricant composition for gear oil
    Patent number: 11261399
    Abstract: The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which includes an ethylene-alphaolefin oligomer and an alkylated phosphonium compound, thus realizing energy reduction and an increased endurance life, and which is thus suitable for use in gear oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, and an alkylated phosphonium compound.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: March 1, 2022
    Assignee: DL Chemical CO., LTD.
    Inventors: Hyeung Jin Lee, Kyong Ju Na
  • MODIFIED POLYISOBUTYLENE POLYMER FOR RUBBER COMPOUNDING AND RUBBER COMPOSITION COMPRISING SAME
    Publication number: 20210054116
    Abstract: The present invention relates to a modified polyisobutylene polymer for rubber compounding including polyisobutylene having isobutylene as a main chain, unsaturated dicarboxylic anhydride, and a silane compound, and more particularly, 20 to 80 wt % of polyisobutylene having isobutylene as a main chain, 1 to 20 wt % of unsaturated dicarboxylic anhydride, and 1 to 60 wt % of a silane compound. In particular, when the polyisobutylene polymer of the present invention is used as an additive for rubber, the dispersibility of a filler can be significantly increased and both grip performance and rolling resistance can be improved.
    Type: Application
    Filed: August 10, 2020
    Publication date: February 25, 2021
    Applicant: DAELIM INDUSTRIAL CO., LTD.
    Inventors: Se Hyun LEE, Kyong Ju NA, Min Sup PARK, Myeong Seok KIM
  • LUBRICANT COMPOSITION FOR GEAR OIL
    Publication number: 20200277540
    Abstract: The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which includes an ethylene-alphaolefin oligomer and an alkylated phosphonium compound, thus realizing energy reduction and an increased endurance life, and which is thus suitable for use in gear oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, and an alkylated phosphonium compound.
    Type: Application
    Filed: November 12, 2019
    Publication date: September 3, 2020
    Applicant: DAELIM INDUSTRIAL CO., LTD.
    Inventors: Hyeung Jin LEE, Kyong Ju NA