Patents by Inventor Shiro Nagahata

Shiro Nagahata 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 preparation of polyurethane-polycarbodiimide foam
    Patent number: 5621051
    Abstract: A process for preparation of a polyurethane-polycarbodiimide foam which comprises reacting a polyol component containing a benzylic ether type phenol resin having hydroxymethyl groups with an organic polyisocyanate component in the presence of an organotin catalyst for urethane formation and a carbodiimidating catalyt. According to this process, it is unnecessary to use fluorine-containing halogenated hydrocarbons as a blowing agent, and blowing on the spot is possible using a spray blowing machine or the like.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: April 15, 1997
    Assignee: Nisshinbo Industries, Inc.
    Inventors: Tatsuya Okutani, Yasuo Imashiro, Eiji Sasaki, Shiro Nagahata, Kiyotake Morimoto