Patents by Inventor Takao HIRAMA

Takao HIRAMA 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: 11029477
    Abstract: Provided is an optical fiber cable that is easier to be laid and enables higher-density packaging than an existing cable. This optical fiber cable is a slotless type optical fiber cable including: an optical unit formed by collecting and twisting a plurality of optical fibers or ribbons each formed by arranging the plurality of optical fibers; a cable core housing the optical unit; and a cable jacket provided around the cable core, and a tension member made of a fiber body within the cable core.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: June 8, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Fumiaki Sato, Yoshiaki Nagao, Ryoei Oka, Ken Takahashi, Takao Hirama
  • Patent number: 11029478
    Abstract: Provided is a polyethylene resin for use in a spacer for an optical fiber cable, the polyethylene resin having a density of 0.952 g/cm3 or more, containing a polyethylene having a molecular weight of 10,000 or less in a weight fraction of 22% or more, and containing a polyethylene having a molecular weight of 300,000 or more in a weight fraction of 12% or more.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: June 8, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Ryoei Oka, Fumiaki Sato, Kentaro Takeda, Takao Hirama, Taro Fujita, Ken Takahashi
  • Publication number: 20200292772
    Abstract: Provided is a polyethylene resin for use in a spacer for an optical fiber cable, the polyethylene resin having a density of 0.952 g/cm3 or more, containing a polyethylene having a molecular weight of 10,000 or less in a weight fraction of 22% or more, and containing a polyethylene having a molecular weight of 300,000 or more in a weight fraction of 12% or more.
    Type: Application
    Filed: October 4, 2017
    Publication date: September 17, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Ryoei OKA, Fumiaki SATO, Kentaro TAKEDA, Takao HIRAMA, Taro FUJITA, Ken TAKAHASHI
  • Publication number: 20200041739
    Abstract: Provided is an optical fiber cable that is easier to be laid and enables higher-density packaging than an existing cable. This optical fiber cable is a slotless type optical fiber cable including: an optical unit formed by collecting and twisting a plurality of optical fibers or ribbons each formed by arranging the plurality of optical fibers; a cable core housing the optical unit; and a cable jacket provided around the cable core, and a tension member made of a fiber body within the cable core.
    Type: Application
    Filed: March 19, 2018
    Publication date: February 6, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Fumiaki SATO, Yoshiaki NAGAO, Ryoei OKA, Ken TAKAHASHI, Takao HIRAMA