Patents by Inventor Yoshiji Yabana

Yoshiji Yabana 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: 4932180
    Abstract: In a building having electromagnetically shielded sections formed by using electromagnetic shielding members as structural members for outer walls, floors an so forth, a zone partitioned with a bearing wall structure having walls such as a fire wall (12) reaching a floor slab is formed as a unit of the electromagnetically shielded space, thereby eliminating the need for an additional process of forming a rising portion or a partition formed on a partition wall formed below a double-ceiling. At the connection between the floor slab and the wall, a space formed therebetween is filled with asbestos (42), and the floor slab and the wall are integrally connected electrically, and a space between a column (51) and a floor decking plate (52) is covered with a shielding plate (54) while the floor slab is fabricated in an ordinary manner, thus forming electromagnetically shielded sections.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: June 12, 1990
    Assignee: Shimizu Construction Co., Ltd.
    Inventors: Takeshi Takahashi, Masatake Nakamura, Yoshiji Yabana, Toshiyuki Ishikawa
  • Patent number: 4894489
    Abstract: An electromagnetic shield-type doorway for a building is provided with two doors having a curved passageway between them. By lengthening the passageway to such an extent that the two doors cannot be opened simultaneously, electric waves can be blocked at either of the doors. The electromagnetic shielding effect can be enhanced by installing a revolving door in the passageway and attaching electrically conductive brushes to at least the lower edge and one side edge of the revolving door to fill the gaps at these edges. In a system for electromagnetically shielding a building, a doorway passageway of the building is partitioned by three or more doorways each having an electromagnetic shielding function. When persons leaving and exiting a building simultaneously approach entrance and exit doors at the ends of the doorway passageway so that these doors open at the same time, the central doorway remains closed to maintain the integrity of the electromagnetic shield.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: January 16, 1990
    Assignee: Shimizu Construction Co., Ltd.
    Inventors: Takeshi Takahashi, Masatake Nakamura, Yoshiji Yabana, Toshiyuki Ishikawa, Koji Nagata
  • Patent number: 4889958
    Abstract: A building with an electromagnetic shield structure for individual floors uses an electromagnetic shielding material in a body of the building and in openings such as windows and doorways, and the external wall surface of the building is covered with an electromagnetic shielding layer. An electromagnetically shielded space within the building is divided into individual floors by floor partitions using an electromagnetic shielding material. Wireless communication utilizing electric waves is carried out within the building, with the same frequency band or any desired frequency band being allotted to each floor. With the above arrangement, sets of communications equipment using the same frequency band on one floor can communicate with one another without interfering with sets on another floor, even though the sets of equipment on the other floors use the same frequency band.
    Type: Grant
    Filed: June 10, 1987
    Date of Patent: December 26, 1989
    Assignee: Shimizu Construction Co., Ltd.
    Inventors: Takeshi Takahashi, Masatake Nakamura, Yoshiji Yabana, Toshiuyki Ishikawa, Koji Nagata
  • Patent number: 4814694
    Abstract: Disclosed is a system for detecting and processing an abnormality in electromagnetic shielding for use in an intelligent building which is constructed using an electromagnetic shielding material for the skeleton and openings such as windows and doorways so that the whole of the building is formed into an electromagnetic shielding structure in order to carry out radio communication inside the building. The system has radio wave detecting means for detecting an external radio wave inside the building, level judging means for judging the level of an external radio wave detected by the radio wave detecting means, and processing means for detecting and processing an abnormality on the basis of an output from the level judging means, whereby an abnormality in the electromagnetic shielding performance is detected on the basis of the intensity level of a detected radio wave intruding into the building from the outside.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: March 21, 1989
    Assignee: Shimizu Construction Co., Ltd.
    Inventors: Takeshi Takahashi, Masatake Nakamura, Yoshiji Yabana, Toshiyuki Ishikawa, Koji Nagata
  • Patent number: 4810961
    Abstract: Disclosed is a radio wave leakage diagnosing system for use in an intelligent building which is constructed using an electromagnetic shielding material for the skeleton and openings such as windows and doorways so that the whole of the building is formed into an electromagnetic shielding structure. The system has a radio wave detector disposed outside the building for detecting a predetermined radio wave transmitted from each floor of the building, so that a floor, togethere with a specific position, where there is a leakage of radio wave is detected on the basis of the intensity of the detected radio wave. With this arrangement, a predetermined radio wave is transmitted from each floor of the building and the transmitted radio wave is detected by the radio wave detector.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: March 7, 1989
    Assignee: Shimizu Construction Co., Ltd.
    Inventors: Takeshi Takahashi, Masatake Nakamura, Yoshiji Yabana, Toshiyuki Ishikawa, Koji Nagata
  • Patent number: 4758686
    Abstract: In a building in which electromagnetic shielding members are used in a body of the building and at openings such as windows, entrances and exits to provide the overall building with electromagnetic shielding, a window glass and a window frame are each provided with an electromagnetic shielding body formed so as to be electrically integrated with a grounded connection of a building structure. This enables the window openings to be provided with an electromagnetic shielding effect through simple construction work irrespective of the structure, shape and material of the window opening. Further, an earth bond is obtained between a sash frame and iron rods for reinforcing the concrete of the building body. This makes it possible to ground the sash frame in a simple manner without exposing it, and to obtain an electromagnetic shielding effect, merely by providing the earth bond between the reinforcing rods and sash frame before the concrete is poured.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: July 19, 1988
    Assignee: Shimizu Construction Co., Ltd.
    Inventors: Takeshi Takahashi, Masatake Nakamura, Yoshiji Yabana, Toshiyuki Ishikawa, Koji Nagata