Patents by Inventor Yuzo Hata

Yuzo Hata 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).

  • Flame retardants for polyamides
    Patent number: 4263203
    Abstract: A flame retardant for imparting excellent flame retardancy to polyamides used as engineering plastics, is a reaction product obtained by reacting a benzenesulfonic acid type compound having the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 respectively represent H, SO.sub.3 H, NH.sub.2, COOH, OH, CN or NO.sub.2, with dicyandiamide or melamine.
    Type: Grant
    Filed: April 17, 1979
    Date of Patent: April 21, 1981
    Assignee: Unitika Limited
    Inventors: Yuzo Hata, Katsumi Kuratani