Patents by Inventor Tetsuro Yabuta

Tetsuro Yabuta 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 and apparatus for measuring length of conduit and for diagnosing inside of conduit
    Patent number: 5528938
    Abstract: A method of measuring a length of a conduit comprises the steps of: supplying air into a conduit to insert a filamentary body into the conduit by flow of the air; detecting arrival of a forward end of the filamentary body at an outlet of the conduit; and measuring the length of the conduit from the length of the filamentary body inserted into the conduit. An apparatus for measuring a length of a conduit, comprises an air supply device for supplying air into the conduit; a filamentary body including a wire and a plurality of elastic large-diameter members attached to the wire; and a device for detecting that a forward end of the filamentary body arrives at an outlet end of the conduit, where the length of the conduit is measured from the length of the filamentary body inserted into the conduit.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: June 25, 1996
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Hiroaki Sano, Kinji Taguchi, Shigeru Tanaka, Tetsuro Yabuta, Takeshi Tsujimura
  • Method and apparatus for measuring length of conduit and for diagnosing inside of conduit
    Patent number: 5505086
    Abstract: A method of measuring a length of a conduit comprises the steps of: supplying air into a conduit to insert a filamentary body into the conduit by flow of the air; detecting arrival of a forward end of the filamentary body at an outlet of the conduit; and measuring the length of the conduit from the length of the filamentary body inserted into the conduit. An apparatus for measuring a length of a conduit, comprises an air supply device for supplying air into the conduit; a filamentary body including a wire and a plurality of elastic large-diameter members attached to the wire; and a device for detecting that a forward end of the filamentary body arrives at an outlet end of the conduit, where the length of the conduit is measured from the length of the filamentary body inserted into the conduit.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: April 9, 1996
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph & Telephone Corp.
    Inventors: Hiroaki Sano, Kinji Taguchi, Shigeru Tanaka, Tetsuro Yabuta, Takeshi Tsujimura
  • Optical cable and its manufacturing method
    Patent number: 5136673
    Abstract: An optical cable has a center member, around which a plurality of coated optical fibers are tightly stranded. Each optical fiber is given uneven strains in its longitudinal direction. Adhesive resin is applied to surround each of the coated optical fibers and binds each of them to the center member to make an integral optical unit when cured.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: August 4, 1992
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Nobuyuki Yoshizawa, Tsuneo Horiguchi, Koushi Ishihara, Tetsuro Yabuta, Toshio Kurashima, Hidenobu Tada