Patents by Inventor Hirohito Yoneyama

Hirohito Yoneyama 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).

  • Organic light emitting diode
    Patent number: 6670052
    Abstract: An organic light emitting diode having high luminous intensity, and providing stabilized performance even during repetitive use and easy to manufacture, by using a charge transporting polymer having the following general formulae (I-1) and (I-2). where Ar represents a substituted or non-substituted monovalent polynulear aromatic ring having number of aromatic rings of 3 to 10, X represents a substituted or non-substituted bivalent aromatic group, T represents a bivalent linear hydrocarbon group of 1 to 6 carbon atoms, m represents an integer of 1 to 3 and k represents 0 or 1.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: December 30, 2003
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hidekazu Hirose, Daisuke Okuda, Hirohito Yoneyama, Mieko Seki, Kiyokazu Mashimo, Takeshi Agata, Katsuhiro Sato
  • Organic electroluminescence device
    Patent number: 6652995
    Abstract: An organic electroluminescence device contains a hole transporting polyesters represented by the following formulae (I-1) or (I-2): where Ar represents a substituted or unsubstituted monovalent polynulear aromatic ring having a number of aromatic rings of 3 to 10, or a substituted or unsubstituted monovalent condensed aromatic ring having a number of aromatic rings of from 2 to 10, X represents a substituted or unsubstituted bivalent aromatic group, T represents a bivalent linear hydrocarbon group of 1 to 6 carbon atoms or bivalent branched hydrocarbon group of 2 to 20 carbon atoms and k represents 0 or 1.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: November 25, 2003
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Mieko Seki, Daisuke Okuda, Hirohito Yoneyama, Hidekazu Hirose, Kiyokazu Mashimo, Takeshi Agata, Katsuhiro Sato
  • Charge-transporting polymer
    Publication number: 20030207187
    Abstract: A charge-transporting polymer is represented by the following general formula (I-1) or (I-2): 1
    Type: Application
    Filed: September 10, 2002
    Publication date: November 6, 2003
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Mieko Seki, Hirohito Yoneyama, Daisuke Okuda, Hidekazu Hirose, Tadayoshi Ozaki, Takeshi Agata, Toru Ishii, Kiyokazu Mashimo, Katsuhiro Sato
  • Organic electroluminescence device
    Publication number: 20020182440
    Abstract: An organic electroluminescence device contains a hole transporting polyesters represented by the following formulae (I-1) or (1-2): 1
    Type: Application
    Filed: October 11, 2001
    Publication date: December 5, 2002
    Applicant: Fuji Xerox Co., Ltd
    Inventors: Mieko Seki, Daisuke Okuda, Hirohito Yoneyama, Hidekazu Hirose, Kiyokazu Mashimo, Takeshi Agata, Katsuhiro Sato
  • Organic light emitting diode
    Publication number: 20020050597
    Abstract: An organic light emitting diode having high luminous intensity, and providing stabilized performance even during repetitive use and easy to manufacture, by using a charge transporting polymer having the following general formulae (I-1) and (I-2).
    Type: Application
    Filed: August 27, 2001
    Publication date: May 2, 2002
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hidekazu Hirose, Daisuke Okuda, Hirohito Yoneyama, Mieko Seki, Kiyokazu Mashimo, Takeshi Agata, Katsuhiro Sato