Patents by Inventor Toshimasa Hirasawa

Toshimasa Hirasawa 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).

  • Plant growth sheet structure, natural turf sheet structure, method of growing turf and method of laying turf sheet structure
    Patent number: 6219965
    Abstract: This invention provides a plant growth sheet structure which includes a base web layer and a core layer integrally coupled together in this order, a base web layer, a plant seed holding layer and a core layer integrally coupled together in this order, or a base web layer, a core layer, a plant seed holding layer and a cover web layer integrally coupled together in this order, and is provided at its surface with plant protection projections, and also provides a natural turf sheet structure including a natural turf grown on the plant growth sheet structure.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: April 24, 2001
    Assignees: Otsuka Kagaku Kabushiki Kaisha, Maedakensetsukogyo Kabushiki Kaisha
    Inventors: Yoshio Ishikawa, Hiroaki Fukumoto, Toshimasa Hirasawa, Tatsuo Hatado, Akira Taga, Kaoru Yamada
  • Openable and closeable roof construction
    Patent number: 5394659
    Abstract: The present invention relates to an openable roof having two pairs of half dome openable roofs provided on a ring shaped set roof having a flat upper surface. In the center of the set roof, an aperture is provided; this aperture being opened or closed by these two pairs of openable roofs. Furthermore, either respective pair of these two pairs of openable roofs may be selected and utilized to open and close the aperture as necessary.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: March 7, 1995
    Assignees: Mamoru Kawaguchi, Maeda Corporation
    Inventors: Mamoru Kawaguchi, Toshimasa Hirasawa, Tatsuo Hatato
  • Dome shaped roof structure
    Patent number: 5371983
    Abstract: A dome shaped roof structure suitable for a stadium for indoor athletic sports is disclosed. The dome shaped roof structure comprises a main frame for covering the inside of the stadium and a reinforcing frame. The reinforcing frame comprises: cables disposed in the inner side of the main frame and extended radially from the central portion of the main frame to the bottom peripheral border; circular cables disposed concentrically about the peripheral border of the main frame; and strut members that have each upper end connected to the steel member of the main frame at an intersecting point of the radiating cables and the circular cables, and the strut members vertically supported by the radiating cables and the circular cables; and wherein tension is introduced to the radiating cables in the direction of the bottom peripheral border and the outer ends of the radiating cables are fixed with the main frame, so that the steel members of the main frame are thrust up by the strut members of the reinforcing frame.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: December 13, 1994
    Assignee: Mamoru Kawaguchi and Maeda Corporation
    Inventors: Mamoru Kawaguchi, Toshimasa Hirasawa, Tatsuo Hatato, Akira Taga, Ikuo Tatemichi
  • Openable and closeable roof construction
    Patent number: 5257485
    Abstract: The present invention relates to an openable roof having two pairs of half dome openable roofs provided on a ring shaped set roof having a flat upper surface. In the center of the set roof, an aperture is provided; this aperture being opened or closed by these two pairs of openable roofs. Furthermore, either respective pair of these two pairs of openable roofs may be selected and utilized to open and close the aperture as necessary.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: November 2, 1993
    Assignees: Mamoru Kawaguchi, Maeda Corporation
    Inventors: Mamoru Kawaguchi, Toshimasa Hirasawa, Tatsuo Hatato, Kaoru Yamada, Akira Taga