Patents by Inventor Shigeaki Yamashita

Shigeaki Yamashita 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).

  • Patent number: 6112408
    Abstract: A method for fabricating a chip carrier, e.g., a printed circuit board, which includes at least one photo-via is disclosed. This method inlcudes the steps of forming a first dielectric layer on a substrate. A second dielectric layer, having a greater photosensitivity than the first dielectric layer, is formed on the first dielectric layer. Preferably, this second dielectric layer has a relatively low optical absorptivity at the wavelengths to be used during exposure. Then, at least the second dielectric layer is selectively exposed to actinic radiation. The second and first dielectric layers are then developed, to form one or more desired photo-vias.
    Type: Grant
    Filed: January 28, 1998
    Date of Patent: September 5, 2000
    Assignee: International Business Machines Corporation
    Inventors: Takayuki Haze, Shigeaki Yamashita
  • Patent number: 5985521
    Abstract: A method for fabricating a chip carrier, such as a printed circuit board, which includes at least one through hole or via hole, is disclosed. In accordance with this method, an electrically conductive layer is formed on at least one of the major surfaces of the corresponding chip carrier substrate, as well as for the surface of the through hole or via hole. Significantly, the electrically conductive layer on the at least one major surface is relatively thin, which permits the formation of a relatively high density of circuit lines in this layer. On the other hand, the electrically conductive layer on the surface of the through hole or via hole is relatively thick, which prevents the formation of defects in this layer.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: November 16, 1999
    Assignee: International Business Machines Corporation
    Inventors: Yasuo Hirano, Yoshiyuki Naitoh, Shigeaki Yamashita
  • Patent number: 4599537
    Abstract: An infrared light emitting element and an infrared/invisible conversion fluroescent substance are provided, and infrared rays to be generated from said infrared light emitting element are emitted outside, and simultaneously part of said infrared rays is illuminated on said fluorescent substance and visible light rays to be generated from said fluorescent substance are emitted outside through an optical fiber.
    Type: Grant
    Filed: April 27, 1983
    Date of Patent: July 8, 1986
    Inventor: Shigeaki Yamashita
  • Patent number: 4575852
    Abstract: A p-type semiconductor layer and an active layer and an n-type semiconductor layer are laminated in this order onto an n-type semiconductor layer. The n-type semiconductor layer is provided with an electron injection electrode on its upper part and a narrow current path is formed in its interior with the inversion diffusion layers. A positive hole injection electrode is provided on the p-type semiconductor layer. The direction of taking out the positive hole injection layer is the same as that of the electron injection electrode.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: March 11, 1986
    Assignee: Omron Tateisi Electronics, Co.
    Inventors: Akira Fujimoto, Shigeaki Yamashita, Hirohiko Yasuda, Yoshikazu Yama