Patents by Inventor Yoshiaki Tsubara

Yoshiaki Tsubara 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).

  • Polymeric fluorescent substance, production thereof and polymer light-emitting device
    Patent number: 6905785
    Abstract: Provided is a method of producing a polymeric fluorescent substance wherein one or more monomers represented by the general formula (1) are polymerized in the presence of a zerovalent nickel complex, X1—Ar1—X2??(1) wherein, Ar1 represents a divalent group selected from the group consisting of arylene groups, divalent heterocyclic compound groups, and divalent or trivalent hetero atom-bonded arylene or divalent heterocyclic compound groups, and X1 and X2 represent leaving groups. By using the polymeric fluorescent substance, a high performance polymer LED can easily be obtained.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: June 14, 2005
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takanobu Noguchi, Yoshiaki Tsubara, Shuji Doi
  • Polymeric fluorescent substance, production thereof and polymer light-emitting device
    Publication number: 20020177687
    Abstract: Provided is a method of producing a polymeric fluorescent substance wherein one or more monomers represented by the general formula (1) are polymerized in the presence of a zerovalent nickel complex,
    Type: Application
    Filed: February 4, 2002
    Publication date: November 28, 2002
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Takanobu Noguchi, Yoshiaki Tsubara, Shuji Doi