Patents by Inventor Hiroshi Mitsukawa

Hiroshi Mitsukawa 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).

  • Cement admixture and cement composition comprising this
    Patent number: 6454850
    Abstract: The present invention provides: a cement admixture which displays excellent cracking inhibition effect and brings about good fluidity even if the quantity of the cement admixture as added is small; and a cement composition comprising this cement admixture. The cement admixture comprises a polyalkylene glycol (A) and a polyalkylene glycol mono(meth)acrylate/unsaturated carboxylic acid-based copolymer (B), wherein: the average molecular weight (X) of the (A) is in the range of 400 to 10,000; the average molecular weight (X) of the (A) and the average molecular weight (Y) of a polyalkylene glycol chain portion of the (B) satisfy 0.9<(X/Y)<1.1; and the weight ratio of the (A) to the (B) is in the range of (A)/(B)=0.02 to 0.3. The cement composition at least comprises the above cement admixture, water, and cement.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: September 24, 2002
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Akihiko Yamashita, Hiroshi Mitsukawa, Tsuyoshi Hirata
  • Cement admixture and cement composition comprising this
    Publication number: 20010052308
    Abstract: The present invention provides: a cement admixture which displays excellent cracking inhibition effect and brings about good fluidity even if the quantity of the cement admixture as added is small; and a cement composition comprising this cement admixture. The cement admixture comprises a polyalkylene glycol (A) and a polyalkylene glycol mono(meth)acrylate/unsaturated carboxylic acid-based copolymer (B), wherein: the average molecular weight (X) of the (A) is in the range of 400 to 10,000; the average molecular weight (X) of the (A) and the average molecular weight (Y) of a polyalkylene glycol chain portion of the (B) satisfy 0.9<(X/Y)<1.1; and the weight ratio of the (A) to the (B) is in the range of (A)/(B)=0.02 to 0.3. The cement composition at least comprises the above cement admixture, water, and cement.
    Type: Application
    Filed: April 23, 2001
    Publication date: December 20, 2001
    Applicant: Nippon Shokubai Co., Ltd.
    Inventors: Akihiko Yamashita, Hiroshi Mitsukawa, Tsuyoshi Hirata