Patents by Inventor Hyong Sop JO

Hyong Sop JO 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).

  • Thick polyimide film having improved surface quality and method of manufacturing same
    Patent number: 11945922
    Abstract: The present invention provides a polyimide film in which a parameter A for the relationship of the viscosity (V) of a polyamic acid solution, the number average molecular weight (Mn) of polyamic acid, and the thickness (T) of a polyimide film falls within a range from 0.4 to 1.13.
    Type: Grant
    Filed: November 22, 2018
    Date of Patent: April 2, 2024
    Assignee: PI ADVANCED MATERIALS CO., LTD.
    Inventors: Won Ho Son, Hyong Sop Jo
  • Polyimide film comprising omnidirectional polymer chain, method for manufacturing same, and graphite sheet manufactured using same
    Patent number: 11945912
    Abstract: The present invention provides a method of manufacturing a polyimide film including unit polymers that are omnidirectionally distributed, and a polyimide film. The present invention also provides a graphite sheet having good quality manufactured using the polyimide film.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: April 2, 2024
    Assignee: PI ADVANCED MATERIALS CO., LTD.
    Inventors: Hyong Sop Jo, Jae Hyun Kim
  • POLYIMIDE FILM FOR GRAPHITE SHEET, AND GRAPHITE SHEET MANUFACTURED THEREFROM
    Publication number: 20220372224
    Abstract: Disclosed herein are a polyimide film for graphite sheets and a graphite sheet manufactured using the same. The polyimide film is fabricated by imidizing a precursor composition including: a polyamic acid prepared by reacting a dianhydride monomer with a diamine monomer; and an organic solvent, wherein the diamine monomer includes about 30 mol % to about 70 mol % of 4,4?-methylenedianiline and about 30 mol % to about 70 mol % of 4,4?-oxydianiline based on the total number of moles of the diamine monomer, 4,4?-methylenedianiline and 4,4?-oxydianiline being present in total in an amount of about 85 mol % or more based on the total number of moles of the diamine monomer.
    Type: Application
    Filed: September 15, 2020
    Publication date: November 24, 2022
    Inventors: Won Ho SON, Hyong Sop JO
  • THICK POLYIMIDE FILM HAVING IMPROVED SURFACE QUALITY AND METHOD OF MANUFACTURING SAME
    Publication number: 20220033597
    Abstract: The present invention provides a polyimide film in which a parameter A for the relationship of the viscosity (V) of a polyamic acid solution, the number average molecular weight (Mn) of polyamic acid, and the thickness (T) of a polyimide film falls within a range from 0.4 to 1.13.
    Type: Application
    Filed: November 22, 2018
    Publication date: February 3, 2022
    Inventors: Won Ho SON, Hyong Sop JO
  • POLYIMIDE FILM COMPRISING OMNIDIRECTIONAL POLYMER CHAIN, METHOD FOR MANUFACTURING SAME, AND GRAPHITE SHEET MANUFACTURED USING SAME
    Publication number: 20200399427
    Abstract: The present invention provides a method of manufacturing a polyimide film including unit polymers that are omnidirectionally distributed, and a polyimide film. The present invention also provides a graphite sheet having good quality manufactured using the polyimide film.
    Type: Application
    Filed: November 20, 2018
    Publication date: December 24, 2020
    Inventors: Hyong Sop JO, Jae Hyun KIM