Patents by Inventor Tae Gi CHOI

Tae Gi 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).

  • METHOD FOR PREPARING A CATHODE OF A SECONDARY BATTERY AND A PURIFIED N-METHYL PYRROLIDONE, AND PURIFYING A WASTE N-METHYL PYRROLIDONE USING AN INHIBITOR
    Publication number: 20240387829
    Abstract: In a method for preparing a cathode of a secondary battery, a method for preparing a purified N-methyl pyrrolidinone (NMP), and a method for purifying a waste NMP, an inhibitor is added to prevent NMP from being decomposed to produce formaldehyde during the process. 1. The inhibitor may be a phenol-based antioxidant and/or an amine-based light stabilizer.
    Type: Application
    Filed: May 16, 2024
    Publication date: November 21, 2024
    Inventors: JAE WON SHIM, SUNG WON SHIM, BYUNG KI SON, HWAN CHOI, YOUN SOO SHIN, TAE GI CHOI, HWA YEONG CHOI, YEONG SU CHOO
  • PURIFICATION METHOD OF HIGH PURITY ISOPROPYL ALCOHOL USED IN SEMICONDUCTOR CLEANING PROCESS
    Publication number: 20230365904
    Abstract: In a method for purifying highly pure isopropyl alcohol used in a semiconductor cleaning process, diacetone alcohol present in isopropyl alcohol is removed by an adsorption process, and diacetone alcohol, triisopropyl borate, and metal impurities are removed by a distillation process. The purified isopropyl alcohol may have a purity of has the moisture of 10 ppm or less, the triisopropyl boron compound of 50 ppt or less, and each metal of the metal impurities of 20 ppt or less.
    Type: Application
    Filed: May 10, 2023
    Publication date: November 16, 2023
    Inventors: Sung Won SHIM, Byung Ki SON, Yung LIM, Hwan CHOI, Youn Soo SHIN, Min Young KIM, Tae Gi CHOI
  • METHOD FOR PURIYFING WASTE N-METHYL-2-PYRROLIDONE
    Publication number: 20230192609
    Abstract: Provided is a method for purifying waste N-methyl-2-pyrrolidone, the method comprising the steps of: reacting the waste N-methyl-2-pyrrolidone containing an amine compound with an acid anhydride; converting the amine compound into an amide compound; and removing the amide compound by distillation, thereby manufacturing high-purity N-methyl-2-pyrrolidone that can be reused.
    Type: Application
    Filed: December 20, 2022
    Publication date: June 22, 2023
    Applicant: JAEWON INDUSTRIAL CO., LTD
    Inventors: Sung Won SHIM, Byung Ki SON, Hwan CHOI, Youn Soo SHIN, Hwa Yeong CHOI, Tae Gi CHOI, Yeong Su CHOO