Patents by Inventor Shuhei Namekawa

Shuhei Namekawa 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).

  • (2,5-disubstituted-1,4-phenylene oxide) block or graft copolymer
    Patent number: 6383636
    Abstract: There is disclosed a (2,5-disubstituted-1,4-phenylene oxide) block copolymer which comprises one or more block structural units represented by formula (I) and at least one particular divalent structural unit in a molecule. There is also disclosed a (2,5-disubstituted-1,4-phenylene oxide) graft polymer which comprises one or more structural units of formula (IV), or three or more of structural unit of formula (IV) and particular divalent structural unit, in a molecule. (wherein R1 represents an unsubstituted or substituted hydrocarbon group, and the two R1s may be the same or different; a represents a number average degree of polymerization and is 5 or more; R4 represents a trifunctional unsubstituted or substituted hydrocarbon group; U represents —CO—, —OCO—, or —NHCO—; and f is 1 or 0.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: May 7, 2002
    Assignees: Director-General of National Institute of Advanced Industrial Science and Technology, Ministry of Economy, Trade and Industry, Japan Chemical Innovation Institute
    Inventors: Hideyuki Higashimura, Shuhei Namekawa, Shiro Kobayashi
  • (2,5-disubstituted-1,4-phenylene oxide) block or graft copolymer
    Publication number: 20020007020
    Abstract: There is disclosed a (2,5-disubstituted-1,4-phenylene oxide) block copolymer which comprises one or more block structural units represented by formula (I) and at least one particular divalent structural unit in a molecule. There is also disclosed a (2,5-disubstituted-1,4-phenylene oxide) graft polymer which comprises one or more structural units of formula (IV), or three or more of structural unit of formula (IV) and particular divalent structural unit, in a molecule.
    Type: Application
    Filed: March 28, 2001
    Publication date: January 17, 2002
    Inventors: Hideyuki Higashimura, Shuhei Namekawa, Shiro Kobayashi