Patents by Inventor Yoshifumi Shimoyama

Yoshifumi Shimoyama 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).

  • Concrete composition for underwater use
    Patent number: 4743301
    Abstract: A concrete composition for underwater use contains about 0.1 to 4% by weight based on cement content of a water soluble vinyl polymer containing vinyl units having sulfonic groups. The concrete composition is easy to mix and prevents separation of concrete composition constituents as it is laid under water.
    Type: Grant
    Filed: July 26, 1985
    Date of Patent: May 10, 1988
    Assignees: Takenaka Komuten Co., Ltd., Takenaka Doboku Co., Ltd., Sankyo Chemical Industries, Ltd.
    Inventors: Koichi Ito, Masaharu Sakuta, Yasuhiko Yoshioka, Tadahiro Kaya, Tsunetoshi Shioya, Hiroyuki Yamakawa, Yoshifumi Shimoyama
  • Cement composition for laying underwater
    Patent number: 4508572
    Abstract: A cement composition is provided which has the property of being inseparable in water, having improved strength and no effect in delaying setting time or reducing strength. It is produced at a cheaper cost by reducing the amount of a polyacrylamide compound to a considerable great extent. The polyacrylamide compound is present in an amount of 0.1 to 3% by weight based on the weight of cement, when a dialdehyde is added thereto.
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: April 2, 1985
    Assignees: Takenaka Komuten Co., Ltd., Takenaka Doboku Co., Ltd., Sankyo Chemical Industries Ltd.
    Inventors: Masaharu Sakuta, Soichi Kiya, Iwao Uchizaki, Yasuhiko Yoshioka, Koichi Ito, Tadahiro Kaya, Tsunetoshi Shioya, Yoshifumi Shimoyama, Hiroyuki Yamakawa
  • Water-inseparable concrete composition
    Patent number: 4487633
    Abstract: A concrete composition is provided which has the property of being inseparable in water and no effect in delaying setting time or reducing strength. A polyacrylamide partial hydrolysate having a molecular weight of one million or higher and a hydrolysis degree of from 0.5 to 20% moles is present in an amount of 0.5 to 4% by weight based on the cement constituent proportion.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: December 11, 1984
    Assignees: Takenaka Komuten Co., Ltd., Takenaka Doboku Co., Ltd., Sankyo Chemical Industries Ltd.
    Inventors: Masaharu Sakuta, Soichi Kiya, Iwao Uchizaki, Yasuhiko Yoshioka, Koichi Ito, Toshio Saito, Tadahiro Kaya, Tsunetoshi Shioya, Yoshifumi Shimoyama