Patents by Inventor Hamaho Hashimoto

Hamaho Hashimoto 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 waveguide module having main-line waveguide and branch waveguides, and optical transmission device including such optical waveguide module
    Patent number: 5923800
    Abstract: An optical waveguide module having a main-line waveguide, which is excellent in optical branching properties, important properties of a bus communication network, and the reproducibility of the above branching properties and is easy to produce, and an optical transmission equipment having the above optical waveguide module. The optical waveguide module having a main-line waveguide which is connected to the optical transmission path and works as part of the optical transmission path and a pair of branch waveguides (21,22) which are unidirectionally branched from the main-line waveguide, the main-line waveguide and the branch waveguides being formed by providing an optically transparent polymer film with a refractive index distribution, a light-receiving device (25) being connected to one (21) of a pair of the branch waveguides, a light-emitting device (26) being connected to the other (22).
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: July 13, 1999
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Toshihiko Takano, Michio Ohba, Hisashi Ohwada, Yasunari Kawabata, Hamaho Hashimoto, Kuniaki Jinnai