Patents by Inventor Haruo Nakayasu

Haruo Nakayasu 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 of manufacturing foundry sand molds
    Patent number: 4385656
    Abstract: Mixing (a) a carboxylic acid, (b) a divalent or trivalent metal oxide or hydroxide and (c) a foundry molding sand in the presence of an aqueous solution of (d) a carboxyl-group-containing polymer or (e) water followed by shaping and curing can provide sand molds having sufficiently high green strength without contamination of the working environment. The molding sand composition has excellent processability, which means filling of shapes or molds with the sand can be done with ease. The sand molds manufactured in this way can be disintegrated by a simple procedure. Therefore the molding sand can be used over and over again and does not cause environmental pollution due to disposal of the molding sand.
    Type: Grant
    Filed: July 24, 1981
    Date of Patent: May 31, 1983
    Assignee: Kuraray Company, Ltd.
    Inventors: Hideo Takahashi, Keishiro Igi, Hisashi Ogawara, Haruo Nakayasu
  • Method of manufacturing foundry sand molds
    Patent number: 4330459
    Abstract: Mixing (a) a carboxylic acid, (b) a divalent or trivalent metal oxide or hydroxide and (c) a foundry molding sand in the presence of an aqueous solution of (d) a carboxyl-group-containing polymer or (e) water followed by shaping and curing can provide sand molds having sufficiently high green strength without contamination of the working environment. The molding sand composition has excellent processability, which means filling of shapes or molds with the sand can be done with ease. The sand molds manufactured in this way can be disintegrated by a simple procedure. Therefore the molding sand can be used over and over again and does not cause environmental pollution due to disposal of the molding sand.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: May 18, 1982
    Assignee: Kuraray Company, Ltd.
    Inventors: Hideo Takahashi, Keishiro Igi, Hisashi Ogawara, Haruo Nakayasu