Patents by Inventor Mototaka Egawa

Mototaka Egawa 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).

  • Heat-curing cement composition, method of hardening same, and hardened body formed therefrom
    Patent number: 4964912
    Abstract: A heat-curing cement composition comprising 60 to 75% by weight of 3CaO.SiO.sub.2, in which the total content of 3CaO.Al.sub.2 O.sub.3 and 4CaO.Al.sub.2 O.sub.3.Fe.sub.2 O.sub.3 is lower than 10% by weight, the alkali content is lower than 0.2% by weight as the Na.sub.2 O equivalent, the balance is composed mainly of 2CaO.SiO.sub.2 and gypsum, and the Blain specific surface area is 3500 to 5500 cm.sup.2 /g. This cement composition provides a hardened body when heat-cured under a high temperature of 35.degree. to 85.degree. C.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: October 23, 1990
    Assignee: UBE Industries, Ltd.
    Inventors: Shigeo Okabayashi, Mototaka Egawa, Masao Yuge