Patents by Inventor Sigeru Tozune

Sigeru Tozune 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).

  • Shock-absorbing polyurethane foam and production process thereof
    Patent number: 4987156
    Abstract: A shock-absorbing polyurethane foam is formed of a polyol component and a polyisocyanate component. The polyol component is a mixed polyol having an average hydroxyl number of 130-250 and composed at least of 20-70 parts by weight of a low-molecular polyol having a molecular weight of 300-500 and 80-30 parts by weight of a high-molecular polyol having a molecular weight of 1,500-8,000 per 100 parts by weight of the whole polyol component. The foam further contains 5-150 parts by weight of a plasticizer having a solidification point not higher than -20.degree. C. per 100 parts by weight of the whole polyol component. The foam can be produced by reacting the polyol component and polyisocyanate component in the presence of 5-150 parts by weight of the plasticizer per 100 parts by weight of the polyol component.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: January 22, 1991
    Assignees: Achilles Corporation, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Sigeru Tozune, Shizuo Yamazaki, Ryuichi Komori, Masashi Ishii, Yoshio Sakaguchi, Tetsuya Oda