Patents by Inventor Hyuncheol Choi

Hyuncheol 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).

  • Polyether copolymer
    Patent number: 6706850
    Abstract: A polyether copolymer comprising (A) an aromatic polyether block and (B) an aliphatic polyether block is provided.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: March 16, 2004
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yuji Yoshida, Akira Yokota, Hyuncheol Choi
  • Coating solution for forming porous organic film
    Patent number: 6534595
    Abstract: A coating solution for forming porous organic film comprising the following A) to C), wherein A) and B) have respective heat decomposition initiation temperatures Ta and Tb satisfying a relation: Ta>Tb: A) a thermosetting resin having an aromatic ring in the main chain, B) a heat decomposable resin obtained by polymerization of monomers which include at least one compound represented by the following formula (1) or (2), and C) an organic solvent, wherein, X and each of R1 to R3 are defined in the specification.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: March 18, 2003
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yuji Yoshida, Hyuncheol Choi, Atsushi Sukumoda
  • Polyether resin and coating solution for forming insulation film
    Patent number: 6388044
    Abstract: The present invention provides a thermosetting polyether resin obtained by polycondensing a dihalogen compound with a bisphenol compound to obtain a polyether resin having a repeating unit represented by the formula (1), and introducing a functional group which causes a cross-linking reaction by heating into the resulted polyether resin; The present invention also provides a polyether resin having a low dielectric constant represented by the formula (3):
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: May 14, 2002
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yuji Yoshida, Akira Yokota, Sadanobu Iwase, Hyuncheol Choi
  • Polyether copolymer
    Publication number: 20020006999
    Abstract: A polyether copolymer comprising (A) an aromatic polyether block and (B) an aliphatic polyether block is provided.
    Type: Application
    Filed: April 13, 2001
    Publication date: January 17, 2002
    Inventors: Yuji Yoshida, Akira Yokota, Hyuncheol Choi
  • Coating solution for forming porous organic film
    Publication number: 20010038887
    Abstract: A coating solution for forming porous organic film comprising the following A) to C), wherein A) and B) have respective heat decomposition initiation temperatures Ta and Tb satisfying a relation: Ta>Tb:
    Type: Application
    Filed: December 22, 2000
    Publication date: November 8, 2001
    Inventors: Yuji Yoshida, Hyuncheol Choi, Atsushi Sukumoda