Patents by Inventor Shinji Iwai

Shinji Iwai 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).

  • Method for increasing flexural strength of cement compositions
    Patent number: 4194919
    Abstract: The flexural strength of hydraulic cement compositions is increased by incorporating water-soluble epoxy resins, aliphatic amines and cement dispersants into cement compositions and hardening the compositions.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: March 25, 1980
    Assignee: Kao Soap Co., Ltd.
    Inventors: Kenichi Hattori, Shinji Iwai, Toshio Okuyama, Yuji Nakagawa, Takeo Maeda, Yasuyuki Kawakatsu