Patents by Inventor Giichi Sato

Giichi Sato 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 electroluminescent device
    Patent number: 5276381
    Abstract: An organic electroluminescent device which includes a cathode, an organic emitting layer which includes a quinoline derivative and a quinacridone or quinazoline compound, an organic positive hole transport layer, and an anode, laminated in sequence, has a high emission efficiency and a high color purity of light emitted from the EL device.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: January 4, 1994
    Assignees: Pioneer Electronic Corporation, Nippon Kayaku Kabushiki Kaisha
    Inventors: Takeo Wakimoto, Ryuji Murayama, Hitoshi Nakada, Masaharu Nomura, Giichi Sato
  • Electroluminescent device
    Patent number: 5227252
    Abstract: Electroluminescent device with improved luminous efficiency, where a fluorescent emitting layer and a positive-hole transporting layer are layered on each other and arranged between a cathode and an anode, the two layers comprising organic compounds and the fluorescent emitting layer being composed of quinoline derivative as a host material, characterized by containing in the fluorescent emitting layer, as a guest material, a quinacridone compound of the following formula (A); ##STR1## wherein R.sub.1 and R.sub.2 are independently hydrogen, methyl group or chlorine or the dehydro form of the quinacridone compound.
    Type: Grant
    Filed: January 22, 1991
    Date of Patent: July 13, 1993
    Assignees: Pioneer Electronic Corporation, Nippon Kayaku Kabushiki Kaisha
    Inventors: Ryuji Murayama, Takeo Wakimoto, Hitoshi Nakada, Masaharu Nomura, Giichi Sato
  • Water soluble disazo compound, copper salt thereof, and sheet or film colored therewith
    Patent number: 4514559
    Abstract: A water soluble disazo compound represented by the general formula: ##STR1## wherein X represents a hydrogen atom or a methyl, methoxy or ethoxy group, Y represents a methoxy or ethoxy group, R.sub.1 represents a hydrogen atom or a methyl group, R.sub.2 represents a hydrogen atom or a methyl, --C.sub.2 H.sub.4 OH, ##STR2## group, and the ##STR3## group is bonded at the 6- or 7-position, a copper complex salt thereof, and a sheet or film colored therewith.
    Type: Grant
    Filed: April 27, 1984
    Date of Patent: April 30, 1985
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Giichi Sato, Tadashi Matuo, Tooru Tabei