Patents by Inventor Aki Makiyama

Aki Makiyama 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).

  • Luminescent element material and luminescent element comprising the same
    Patent number: 7318966
    Abstract: A light emitting device includes an emissive substance between an anode and cathode that emits light upon application of electrical energy. The emissive substance included in the device is at least one of the following types of compounds: (a) a compound having a plurality of 1,7-phenanthroline skeletal structures; (b) a benzoquinoline derivative; (c) a spiro compound; and (d) a tetraphenylmethane derivative.
    Type: Grant
    Filed: November 22, 2001
    Date of Patent: January 15, 2008
    Assignee: Toray Industries, Inc.
    Inventors: Tsuyoshi Tominaga, Daisuke Kitazawa, Aki Makiyama, Akira Kohama
  • Luminescent element material and luminescent element comprising the same
    Publication number: 20030168970
    Abstract: The light emitting device of the present invention relates to a light emitting device which is characterized in that it is a device with an emissive substance present between an anode and cathode, and which emits light by means of electrical energy, and said device has a least one type of compound denoted by (a) to (d) below.
    Type: Application
    Filed: September 11, 2002
    Publication date: September 11, 2003
    Inventors: Tsuyoshi Tominaga, Daisuke Kitazawa, Aki Makiyama, Akira Kohama