Patents by Inventor Takaaki Hirokawa

Takaaki Hirokawa 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).

  • Method of constructing information correspondence pipe, constructed structure, and construction member
    Patent number: 7341403
    Abstract: The object is to provide a construction method of an information-communicable underground pipe whereby communication cables can be readily laid in an underground pipeline having a main pipe and branch pipes branched therefrom thereby allowing the underground pipeline to be used as an information-communicable underground pipe, and to provide a construction structure and a construction member therefor.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: March 11, 2008
    Assignees: Sanki Engineering Co., Ltd., Ashimori Industry Co., Ltd., Ashimori Engineering Co., Ltd.
    Inventors: Fumiaki Tsuchiya, Isaburo Yagi, Masaru Yamakawa, Yasuhiro Ueda, Osamu Ishizuka, Koji Aso, Yukikazu Maemoto, Takaaki Hirokawa, Hirofumi Nakatsuka