Patents by Inventor Tetuo Okaniwa

Tetuo Okaniwa 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 dyeing acid-modified polyester fibers
    Patent number: 3977827
    Abstract: A process for dyeing acid-modified polyester fibers comprising contacting the fibers with a dye bath containing a thiazoleazo-type cationic dye of the formula (I), ##SPC1##wherein R.sub.1 and R.sub.2 each is a methyl group or an ethyl group; A and B each is a benzene nucleus which can be substituted with a methyl group, an ethyl group, a methoxy group or an ethoxy group; and X.sup.- is an anion. The cationic dye compounds of the formula (I) dye acid-modified polyester fibers a bright blue shade and with good light fastness.
    Type: Grant
    Filed: February 4, 1975
    Date of Patent: August 31, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Seizo Konishi, Koichi Ishii, Sadaharu Abeta, Tetuo Okaniwa
  • Black dyeing of acid-modified polyester fiber
    Patent number: 3942946
    Abstract: A process for dyeing "acid-modified" polyester fibers, such as "Dacron T-64" fibers, a black color comprising contacting the polyester fibers with a dye bath containing a combination of four kinds of dyes.
    Type: Grant
    Filed: February 5, 1975
    Date of Patent: March 9, 1976
    Assignee: Sumitomo Chemical Company, Ltd.
    Inventors: Tetuo Okaniwa, Sadaharu Abeta