Patents by Inventor Masaki Iwata

Masaki Iwata 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).

  • Carbon fibers for reinforcement of cement and cement composite material
    Patent number: 5855663
    Abstract: There are here disclosed carbon fibers for reinforcement of cement which are obtained by applying, onto the surfaces of carbon fibers, esters of oleic acid and aliphatic monovalent alcohols, esters of oleyl alcohol and monovalent fatty acids, polyoxyalkylene bisphenol ethers or polyether esters as sizing agents, and a cement composite material having a bending strength of 300 kgf/cm.sup.2 or more which contains cut carbon fibers having a fiber length of 10 to 50 mm at a mixing volume ratio of the cut carbon fibers to the cement matrix in the range of 1 to 5%. According to the present invention, there are provided the carbon fibers for reinforcement of cement which have excellent adhesive properties to the cement, good process passage properties through a direct spray gun and good bundling properties and which are suitable for a direct spray method, and the cement composite material using the carbon fibers and having high bending strength.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: January 5, 1999
    Assignees: Petoca, Ltd., Takenaka Corporation
    Inventors: Katsumi Takano, Yasushi Katsuta, Hideyuki Nakajima, Yoshikazu Nagata, Sadatoshi Ohno, Tadahiro Kakizawa, Toshio Yonezawa, Junichi Ida, Masaki Iwata
  • Carbon fibers for reinforcement of cement and cement composite material
    Patent number: 5686181
    Abstract: There are here disclosed carbon fibers for reinforcement of cement which are obtained by applying, onto the surfaces of carbon fibers, esters of oleic acid and aliphatic monovalent alcohols, esters of oleyl alcohol and monovalent fatty acids, polyoxyalkylene bisphenol ethers or polyether esters as sizing agents, and a cement composite material having a bending strength of 300 kgf/cm.sup.2 or more which contains cut carbon fibers having a fiber length of 10 to 50 mm at a mixing volume ratio of the cut carbon fibers to the cement matrix in the range of 1 to 5%. According to the present invention, there are provided the carbon fibers for reinforcement of cement which have excellent adhesive properties to the cement, good process passage properties through a direct spray gun and good bundling properties and which are suitable for a direct spray method, and the cement composite material using the carbon fibers and having high bending strength.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: November 11, 1997
    Assignees: Petoca, Ltd., Takenaka Corporation
    Inventors: Katsumi Takano, Yasushi Katsuta, Hideyuki Nakajima, Yoshikazu Nagata, Sadatoshi Ohno, Tadahiro Kakizawa, Toshio Yonezawa, Junichi Ida, Masaki Iwata
  • Carbon fiber rovings for reinforcement of concrete
    Patent number: 5652058
    Abstract: Carbon fiber rovings for reinforcement of concrete are here disclosed which are obtained by sizing, with a sizing agent, strands each consisting of 100 to 1,000 monofilaments of mesophase pitch-based carbon fibers, and then bundling the thus sized 5 to 100 strands into one roving.
    Type: Grant
    Filed: January 11, 1995
    Date of Patent: July 29, 1997
    Assignees: Petoca, Ltd., Takenaka Corporation
    Inventors: Yoshikazu Nagata, Katsumi Takano, Sadatoshi Ohno, Toshio Yonezawa, Junichi Ida, Masaki Iwata