Patents by Inventor Toshimitu Hiraizumi

Toshimitu Hiraizumi 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 preparing polyurethane foams
    Patent number: 3953384
    Abstract: A process for preparing polyurethane foams by the reaction between a polyol having at least two active hydrogen atoms and a polyisocyanate, in the presence of a potassium .beta.-tertiary-aminopropionate as a catalyst.
    Type: Grant
    Filed: October 25, 1974
    Date of Patent: April 27, 1976
    Assignee: Kao Soap Co., Ltd.
    Inventors: Makoto Funatsu, Shinichiro Yasuda, Toshimitu Hiraizumi