Patents by Inventor Hirofumi Hirota

Hirofumi Hirota 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).

  • Electrically insulating resin composition and a DC electric wire or cable both coated therewith
    Patent number: 7196267
    Abstract: An object of the present invention is to provide an electrically insulative resin composition that exhibits superior electrical properties and processability and an electric wire or cable having a covering made of the resin. The electrically insulative resin composition comprises 60 to 90 percent by weight of ethylene-?-olefin copolymer (A) polymerized with a single-site catalyst and 40 to 10 percent by weight of another polyolefin resin (B), which is other than (A), wherein the composition contains a polyolefin having a graft-polymerized substituent with a dipole moment of not less than 4 Debye.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: March 27, 2007
    Assignee: Sumitomo Electric Industries, Inc.
    Inventors: Yoitsu Sekiguchi, Toshikazu Shibata, Ken-ichi Hirotsu, Tsuyoshi Uozumi, Hirofumi Hirota
  • Electrically insulating resin composition and electric wire or cable both coated therewith
    Publication number: 20030149176
    Abstract: An object of the present invention is to provide an electrically insulative resin composition that exhibits superior electrical properties and processability and an electric wire or cable having a covering made of the resin. The electrically insulative resin composition comprises 60 to 90 percent by weight of ethylene-&agr;-olefin copolymer (A) polymerized with a single-site catalyst and 40 to 10 percent by weight of another polyolefin resin (B), which is other than (A), wherein the composition contains a polyolefin having a graft-polymerized substituent with a dipole moment of not less than 4 Debye.
    Type: Application
    Filed: September 30, 2002
    Publication date: August 7, 2003
    Inventors: Yoitsu Sekiguchi, Toshikazu Shibata, Ken-ichi Hirotsu, Tsuyoshi Uozumi, Hirofumi Hirota