Patents by Inventor Yuriko Sakaguchi

Yuriko Sakaguchi 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 preventing hardened cementitious material from deteriorating
    Patent number: 4931314
    Abstract: The invention is a method for preventing a hardened cementitious material from deteriorating or for repairing a deteriorated cementitious material, and more particularly to such method for the hardened cementitious material comprising metal materials to be corroded by a salt content and cause alkali-aggregate. It is characterized by applying a cement paste, mortar or concrete added with 1-25 weight % lithium nitride relative to the cement content so as to cover the surface of hardened cementitious material.
    Type: Grant
    Filed: October 13, 1988
    Date of Patent: June 5, 1990
    Assignee: Nissan Chemical Industries Ltd.
    Inventors: Makoto Takakura, Takahiro Hori, Yuriko Sakaguchi, Yuji Nakamura
  • Silicate containing agent and cement surface modified with said agent
    Patent number: 4521249
    Abstract: An agent and method for modifying a surface layer of hardened cement structures or substrates with use of the agent which comprises in a specified ratio of an alkali silicate solution and a sodium naphthalenesulfonate-formaldehyde condensate. Said agent has an excellent stability and a remarkable permeability into the cement structure to form a deeper strengthened surface layer thereon.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: June 4, 1985
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Masamichi Obitsu, Takahiro Hori, Toyoji Koinuma, Yuriko Sakaguchi
  • Agent and method for modifying surface layer of cement structures
    Patent number: 4443496
    Abstract: An agent and method for modifying a surface layer of hardened cement structures or substrates with use of the agent which comprises in a specified ratio of an alkali silicate solution and a sodium naphthalenesulfonate-formaldehyde condensate. Said agent has an excellent stability and a remarkable permeability into the cement structure to form a deeper strengthened surface layer thereon.
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: April 17, 1984
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Masamichi Obitsu, Takahiro Hori, Toyoji Koinuma, Yuriko Sakaguchi