Patents by Inventor Itsuo Suda

Itsuo Suda 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).

  • Dyeing automobile seat covers containing acrylic or cationic-dyeable polyester
    Patent number: 5824118
    Abstract: A dye which is durable for practical use in the field of coloring automobile seat materials for which a good light-fastness is required and a dyeing method making use of the dye is provided. In the method, a disazo dye is obtained by converting guanazole to a tetrazo compound and coupling the tetrazo with an indole derivative to form a compound which is then quaternized using e.g., an alkylating agent resulting in a red dye with superior light-fastness at high temperatures.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: October 20, 1998
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Minoru Akai, Itsuo Suda, Katsumi Nonomura, Kumiko Arai