Patents by Inventor Ichiro Ogasawara

Ichiro Ogasawara 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: 5082347
    Abstract: A tape-like coated optical fiber comprises: a plurality of optical fiber strands arranged side by side on a plane; and a tape coating of ultraviolet curable resin applied onto an outer periphery of the plurality of optical fiber strands so as to integrate the plurality of optical fiber strands with each other; each of the plurality of optical fiber strands having an optical fiber glass, a coating layer of ultraviolet curable resin provided on an outer periphery of the optical fiber glass, and a colored layer provided on the coating layer of ultraviolet curable resin. The weight of a volatile component contained in a coloring material used in the colored layer at 60.degree. C. is not larger than 5% of weight of the coloring material.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: January 21, 1992
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Nobuhiro Akasaka, Toshiaki Zakoh, Toru Yamanishi, Wataru Katsurashima, Ichiro Ogasawara
  • Patent number: 4826279
    Abstract: An optical fiber unit for forming high-density optical cables in optical communication networks includes a core body having a twisted tensile strength member extended along the central axis thereof, spiral grooves in the outer surface thereof, and tape-shaped optical fibers placed in the spiral grooves of the core body, with the twist direction of the twisted member and the spiral direction of the grooves being opposite one another. Thus, when the core body is under tension, the angular moment produced in the tensile strength member and that produced in the ribs formed between the spiral grooves are opposite in direction and equal in magnitude, whereby the angular moment of the entire core body is substantially zero. As a result, the optical fiber residual strain produced during manufacture can be controlled with high precision.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: May 2, 1989
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Akira Nishimura, Ichiro Ogasawara
  • Patent number: 4767184
    Abstract: An optical fiber cable in which plural optical fibers are joined in a flat assembly. Each assembly is coated with a water-swelling resin, stacked with other such flat assemblies and fitted in a spiral groove of a spacer. A tape is wound around the so-fitted spacer.
    Type: Grant
    Filed: April 7, 1987
    Date of Patent: August 30, 1988
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Ichiro Ogasawara, Nobumasa Nirasawa, Akira Nishimura
  • Patent number: 4703998
    Abstract: A water-tight optical fiber cable constructed without the need of a viscous water-blocking compound. At least one water-absorbing fibrous braid is placed adjacent each optical fiber to absorb any water which may be present in or enter the cable. Additionally, one or more water-absorbing fibrous braids may be disposed between a tape layer and the surrounding protective sheath of the cable.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: November 3, 1987
    Assignees: Sumitomo Electric Industries, Ltd, Nippon Telegraph & Telephone Public Corporation
    Inventors: Fumikiyo Uchioke, Ichiro Ogasawara, Shuzo Suzuki
  • Patent number: 4653852
    Abstract: A multi core optical fiber made of quartz glass comprising at least two cores the centers of which are arranged substantially on one line. The distances between the centers of the adjacent cores are substantially the same in the longitudinal direction. A first cladding covers the cores and the second cladding covers the first cladding and has a larger refractive index than the first one. The fiber has improved mechanical strength and low cross-talk even if the distance between the adjacent cores is short.
    Type: Grant
    Filed: January 3, 1985
    Date of Patent: March 31, 1987
    Assignees: Sumitomo Electric Industries, Ltd, Nippon Telegraph and Telephone Public Corporation
    Inventors: Shuzo Suzuki, Ichiro Ogasawara, Hiroshi Yokota, Shim Sumida