Patents by Inventor Keiji Tokunaga

Keiji Tokunaga 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).

  • Publication number: 20210119165
    Abstract: An organic material having at least one aromatic conjugated ?-electron system is selected. The purity of the organic material is improved by purification, and a conduction mechanism of the organic material is confirmed by a time-of-flight method, whereby a liquid phase of the organic material is usable as an organic semiconductor. A method that enables the usage of a liquid phase of an organic material as an organic semiconductor is provided. The method involves confirming the electronic conduction of the organic material having at least one aromatic conjugated ?-electron system by evaluation of a charge transport property using a time-of-flight method, and by evaluation of a dilution effect caused by addition of a diluent.
    Type: Application
    Filed: December 28, 2020
    Publication date: April 22, 2021
    Applicant: Japan Science and Technology Agency
    Inventors: Jun-Ichi Hanna, Keiji Tokunaga, Hiroaki Iino
  • Publication number: 20190044082
    Abstract: An organic material having at least one aromatic conjugated ?-electron system is selected. The purity of the organic material is improved by purification, and a conduction mechanism of the organic material is confirmed by a time-of-flight method, whereby a liquid phase of the organic material is usable as an organic semiconductor. A method that enables the usage of a liquid phase of an organic material as an organic semiconductor is provided. The method involves confirming the electronic conduction of the organic material having at least one aromatic conjugated ?-electron system by evaluation of a charge transport property using a time-of-flight method, and by evaluation of a dilution effect caused by addition of a diluent.
    Type: Application
    Filed: October 9, 2018
    Publication date: February 7, 2019
    Inventors: Jun-Ichi HANNA, Keiji TOKUNAGA, Hiroaki IINO
  • Publication number: 20120175604
    Abstract: An organic material having at least one aromatic conjugated ?-electron system is selected. The purity of the organic material is improved by purification, and a conduction mechanism of the organic material is confirmed by a time-of-flight method, whereby a liquid phase of the organic material is usable as an organic semiconductor. A method that enables the usage of a liquid phase of an organic material as an organic semiconductor is provided. The method involves confirming the electronic conduction of the organic material having at least one aromatic conjugated ?-electron system by evaluation of a charge transport property using a time-of-flight method, and by evaluation of a dilution effect caused by addition of a diluent.
    Type: Application
    Filed: September 15, 2010
    Publication date: July 12, 2012
    Inventors: Jun-ichi Hanna, Keiji Tokunaga, Hiroaki Iino
  • Patent number: 7442428
    Abstract: The main object of the present invention is to provide a gas barrier substrate having a high gas barrier property without a ruggedness, a pin hole or the like in the gas barrier layer. The present invention solves the problem by providing a gas barrier substrate having a base material, a planarization layer formed on the base material, and a gas barrier layer comprising a deposition film formed on the planarization layer.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: October 28, 2008
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Sayaka Kawashima, Minoru Komada, Keiji Tokunaga
  • Patent number: 7229703
    Abstract: The main object of the present invention is to provide a gas barrier substrate having a high gas barrier property without a ruggedness, a pin hole or the like in the gas barrier layer. The present invention solves the problem by providing a gas barrier substrate having a base material, a planarization layer formed on the base material, and a gas barrier layer comprising a deposition film formed on the planarization layer.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: June 12, 2007
    Assignee: Dai Nippon Printing Co. Ltd.
    Inventors: Sayaka Kawashima, Minoru Komada, Keiji Tokunaga
  • Publication number: 20070059491
    Abstract: The main object of the present invention is to provide a gas barrier substrate having a high gas barrier property without a ruggedness, a pin hole or the like in the gas barrier layer. The present invention solves the problem by providing a gas barrier substrate having a base material, a planarization layer formed on the base material, and a gas barrier layer comprising a deposition film formed on the planarization layer.
    Type: Application
    Filed: November 10, 2006
    Publication date: March 15, 2007
    Inventors: Sayaka Kawashima, Minoru Komada, Keiji Tokunaga
  • Publication number: 20060231832
    Abstract: A liquid crystalline organic compound which gives a liquid crystal phase in a temperature range containing at least a room temperature and can exhibit a high charge mobility; an organic semiconductor structure and an organic semiconductor device each having the liquid crystalline organic compound are provided.
    Type: Application
    Filed: March 8, 2006
    Publication date: October 19, 2006
    Inventors: Keiji Tokunaga, Yudai Yamashita, Jun-ichi Hanna
  • Patent number: 6866949
    Abstract: The present invention provides a gas barrier film comprising a composite film provided with a gas barrier layer having a laminated structure including at least a metal oxide thin layer on a substrate film having a (1) 80 ppm/° C. or less coefficient of thermal expansion at 50° C. to 150° C. and/or a 10 ppm/% RH or less coefficient of humidity expansion at 25° C., and a (2) 150 C. ° or more glass transition temperature, and a display with a display element covered with the same.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: March 15, 2005
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Yurie Ota, Toshio Yoshihara, Keiji Tokunaga, Minoru Komada
  • Publication number: 20050029513
    Abstract: The main object of the present invention is to provide a gas barrier substrate having a high gas barrier property without a ruggedness, a pin hole or the like in the gas barrier layer. The present invention solves the problem by providing a gas barrier substrate having a base material, a planarization layer formed on the base material, and a gas barrier layer comprising a deposition film formed on the planarization layer.
    Type: Application
    Filed: March 26, 2004
    Publication date: February 10, 2005
    Inventors: Sayaka Kawashima, Minoru Komada, Keiji Tokunaga
  • Publication number: 20040018364
    Abstract: The present invention provides a gas barrier film comprising a composite film provided with a gas barrier layer having a laminated structure including at least a metal oxide thin layer on a substrate film having a (1) 80 ppm/°C. or less coefficient of thermal expansion at 50° C. to 150° C. and/or a 10 ppm/% RH or less coefficient of humidity expansion at 25° C., and a (2) 150C.° or more glass transition temperature, and a display with a display element covered with the same.
    Type: Application
    Filed: March 6, 2003
    Publication date: January 29, 2004
    Inventors: Yurie Ota, Toshio Yoshihara, Keiji Tokunaga, Minoru Komada