Patents by Inventor Ki Hwan Yu

Ki Hwan Yu 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).

  • Phenolic resin, epoxy resin, epoxy resin composition and cured product of same
    Patent number: 11884773
    Abstract: Provided are an epoxy resin composition, which exhibits excellent low dielectric properties, and imparts excellent copper foil peel strength and interlayer cohesive strength when used in printed circuit plate applications; and a phenolic resin or an epoxy resin, which are for forming the epoxy resin composition. The phenolic resin is represented by General Formula (1) below. In the formula, R1's each represent a hydrocarbon group having 1 to 10 carbon atoms; R2's each represent a hydrogen atom, Formula (1a), or Formula (1b), where at least one of R2's is Formula (1a) or Formula (1b); and n represents the number of repetitions of 0 to 5.
    Type: Grant
    Filed: December 9, 2019
    Date of Patent: January 30, 2024
    Assignees: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., KUKDO CHEMICAL CO., LTD.
    Inventors: Masahiro Soh, Kazuo Ishihara, Jin Soo Lee, Jae Il Kim, Joong Hwi Jee, Ki Hwan Yu
  • PHENOLIC RESIN, EPOXY RESIN, EPOXY RESIN COMPOSITION AND CURED PRODUCT OF SAME
    Publication number: 20220056199
    Abstract: Provided are an epoxy resin composition, which exhibits excellent low dielectric properties, and imparts excellent copper foil peel strength and interlayer cohesive strength when used in printed circuit plate applications; and a phenolic resin or an epoxy resin, which are for forming the epoxy resin composition. The phenolic resin is represented by General Formula (1) below. In the formula, R1's each represent a hydrocarbon group having 1 to 10 carbon atoms; R2's each represent a hydrogen atom, Formula (1a), or Formula (1b), where at least one of R2's is Formula (1a) or Formula (1b); and n represents the number of repetitions of 0 to 5.
    Type: Application
    Filed: December 9, 2019
    Publication date: February 24, 2022
    Applicants: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., KUKDO CHEMICAL CO., LTD.
    Inventors: Masahiro Soh, Kazuo Ishihara, Jin Soo Lee, Jae Il Kim, Joong Hwi Jee, Ki Hwan Yu