Patents by Inventor Toyoharu Nawa

Toyoharu Nawa 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).

  • Durability improving agent and cement composition
    Patent number: 8674058
    Abstract: It is an object of the present invention to provide a durability improving agent for a cement composition that improves the freezing-thawing resistance of the cement composition and also exhibits a sufficient shrinkage reducing performance as well, and a cement composition including such a durability improving agent. Specifically, the present invention provides a durability improving agent for a cement composition, characterized by comprising a hydrocarbon-based compound having an average molecular weight of 150 to 600 and a pour point of 20° C. or less as an active ingredient, and a cement composition including such durability improving agent.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: March 18, 2014
    Assignees: National University Corporation Hokkaido University, Flowric Co., Ltd., Miyoshi Oil & Fat Co., Ltd.
    Inventors: Toyoharu Nawa, Hironobu Nishi, Susumu Hashizume, Kazutoshi Toda, Jun Kakutou, Hiroshi Ohshima, Syou Suzuki
  • CONCRETE COMPOSITION
    Publication number: 20120289626
    Abstract: Provided is a hydraulic material composition, including cement and a shrinkage-reducing agent for a hydraulic material, which does not require a combination with any other admixture, is inexpensive, and is capable of suppressing a reduction in strength of a hardened concrete material, suppressing generation of a crack in a hardened concrete material by virtue of its excellent shrinkage-reducing ability, and imparting excellent freeze-thaw resistance. The hydraulic material composition includes cement and a shrinkage-reducing agent for a hydraulic material including at least one kind of polyoxyalkylene compound (A) as an essential component, and has a spacing factor of 350 ?m or less.
    Type: Application
    Filed: January 7, 2011
    Publication date: November 15, 2012
    Applicant: NIPPON SHOKUBAI CO., LTD.
    Inventors: Toyoharu Nawa, Mari Masanaga, Koji Fukuhara
  • DURABILITY IMPROVING AGENT AND CEMENT COMPOSITION
    Publication number: 20120097075
    Abstract: It is an object of the present invention to provide a durability improving agent for a cement composition that improves the freezing-thawing resistance of the cement composition and also exhibits a sufficient shrinkage reducing performance as well, and a cement composition including such a durability improving agent. Specifically, the present invention provides a durability improving agent for a cement composition, characterized by comprising a hydrocarbon-based compound having an average molecular weight of 150 to 600 and a pour point of 20° C. or less as an active ingredient, and a cement composition including such durability improving agent.
    Type: Application
    Filed: May 13, 2010
    Publication date: April 26, 2012
    Applicants: NAT. UNIV. CORP. HOKKAIDO UNIV., MIYOSHI OIL & FAT CO., LTD., FLOWRIC CO., LTD.
    Inventors: Toyoharu Nawa, Hironobu Nishi, Susumu Hashizume, Kazutoshi Toda, Jun Kakutou, Hiroshi Ohshima, Syou Suzuki