Patents by Inventor Yuji Hatakeyama

Yuji Hatakeyama 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).

  • Hardening composition, hardened product, and method of producing hardened product
    Patent number: 5897703
    Abstract: A hardening composition comprising a hardening component and hardening agents, said hardening component consisting essentially of magnesium oxide, said hardening agents consisting essentially of propylene carbonate and water, content of said magnesium oxide being 100 parts by weight, content of said propylene carbonate being 1 to 60 parts by weight, and content of said water being 20 to 135 parts by weight. Further disclosed are a hardened product prepared by hardening the hardening composition, and a method for producing the hardened product.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: April 27, 1999
    Assignee: Tokyo Chemical Co., Ltd
    Inventors: Yuji Hatakeyama, Hiroshi Inoue, Katsuhiko Yamamoto
  • Inorganic hardening composition
    Patent number: 5669968
    Abstract: An inorganic hardening composition contains 100 parts by weight of an alkaline earth metal oxide, and 5 to 80 parts by weight of an organic carbonic acid compound.
    Type: Grant
    Filed: October 17, 1995
    Date of Patent: September 23, 1997
    Assignee: Toyo Chemical Co., Ltd.
    Inventors: Shigeji Kobori, Jotaro Morimoto, Yuji Hatakeyama