Patents by Inventor Koji Choki

Koji Choki 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).

  • Optical waveguides and methods thereof
    Publication number: 20070148566
    Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.
    Type: Application
    Filed: November 22, 2004
    Publication date: June 28, 2007
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
  • Magnetic card having embossed portions and a magnetic layer having magnetic powders specified binder resins and a tensile elongation at break of 50 percent or more
    Patent number: 5356717
    Abstract: Disclosed is a magnetic card which comprises a substrate of a thermoplastic resin and a magnetic recording layer provided on the whole surface of at least one side of the substrate, wherein necessary matters such as letters and figures can be formed in a given area by embossing treatment, and wherein the magnetic recording layer consists of a magnetic film which contains 70% by weight or more of magnetic powders having a coercive force of 300 Oe or higher and which has a tensile break elongation of 50% or more.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: October 18, 1994
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Koji Choki, Masaharu Saito, Kunimasa Kobayashi, Toru Tachiwada, Katsufumi Awaya