Patents by Inventor Toshiharu Takesue

Toshiharu Takesue 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 attenuator and manufacturing method for making same
    Patent number: 4884859
    Abstract: A simple method of manufacturing optical attenuators comprises heating a part of an optical fiber composed of a core and a cladding to a temperature around the softening point of the materials of the optical fiber and applying a tension and/or a twist to the optical fiber at a predetermined speed to form an optical attenuation area having fine cracks in the heated part of the optical fiber.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: December 5, 1989
    Assignee: Seiko Instruments Inc.
    Inventors: Hiroyoshi Yamamoto, Toshiharu Takesue, Naoki Kawawada