Patents by Inventor Keitaro Aoyagi

Keitaro Aoyagi 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).

  • Sludge treatment tank thereof construction method thereof
    Patent number: 5759849
    Abstract: In a sludge treatment tank, members made of a glass long-fiber reinforced foamed plastic composite material are used as formworks in construction and then left as an inside wall member. The composite material functions as formworks in a construction method as well as applies an insulating property and a corrosion resistant property to the sludge treatment tank and further realizes labor saving in a field of construction works, the provision of a good working environment and the reduction of a period of construction work.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: June 2, 1998
    Assignees: The Zenitaka Corporation, Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Keitaro Aoyagi, Sadao Niibe, Toshitomi Umegae, Hideo Iwai, Yoshitugu Oshima
  • Sludge treatment tank and construction method thereof
    Patent number: 5672506
    Abstract: In a sludge treatment tank, members made of a glass long-fiber reinforced foamed plastic composite material are used as formworks in construction and then left as an inside wall member. The composite material functions as formworks in a construction method as well as applies an insulating property and a corrosion resistant property to the sludge treatment tank and further realizes labor saving in a field of construction works, the provision of a good working environment and the reduction of a period of construction work.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: September 30, 1997
    Assignees: The Zenitaka Corporation, Sekisui Kagaku Kogyo K.K.
    Inventors: Keitaro Aoyagi, Sadao Niibe, Toshitomi Umegae, Hideo Iwai, Yoshitugu Oshima