Patents by Inventor Kazuto Hamaishi

Kazuto Hamaishi 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).

  • Process for producing reclaimed expandable polystyrene resin particle
    Patent number: 6649664
    Abstract: It is possible to recover a volume reducing agent from a waste foamed polystyrene resin material compacted with the volume reducing agent and to impregnate a blowing agent into the compacted material at ordinary room temperature. The volume reducing agent is preferably a polar solvent having solubility with respect to the polystyrene resin and exhibiting a mutual solubility with the blowing agent, which is one whose hydrogen bond term &dgr;h and polarity term &dgr;p of the Hansen solubility parameters satisfy the following conditions: (&dgr;p−5.8)2+(&dgr;h−4.3)2<50 and &dgr;p2+&dgr;h2>46  [units :(J/cm3)1/2] The solvent used as the volume reducing agent is preferably at least one solvent selected from the group consisting of ketones, esters, polyhydric alcohol ether acetates, ethers, halogenated hydrocarbons, nitro compounds, and amines.
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: November 18, 2003
    Assignee: Kagoshimaken
    Inventors: Kenryo Nishimoto, Hiroyuki Kariyazono, Kazuto Hamaishi
  • Process for producing reclaimed expandable polystyrene resin particle
    Publication number: 20030036576
    Abstract: It is possible to recover a volume reducing agent from a waste foamed polystyrene resin material compacted with the volume reducing agent and to impregnate a blowing agent into the compacted material at ordinary room temperature.
    Type: Application
    Filed: September 9, 2002
    Publication date: February 20, 2003
    Inventors: Kenryo Nishimoto, Hiroyuki Kariyazono, Kazuto Hamaishi