Patents by Inventor Toshiki Yoshiuji

Toshiki Yoshiuji 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).

  • AlGaInP light-emitting diode
    Patent number: 6346719
    Abstract: An object of the present invention is to provide a high brightness n-side-up type AlGaInP light-emitting device with a simple structure. An n-type upper cladding layer is constructed by superimposing three n-type AlGaInP layers with different electron concentrations. The relationship between the electron concentrations of the three n-type AlGaInP layers is n3>n1>n2.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: February 12, 2002
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Takashi Udagawa, Toshiki Yoshiuji, Ryouichi Takeuchi