Patents by Inventor Tetsuo Okaniwa

Tetsuo 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).

  • Monoazo dyestuffs derived from benzothiazole
    Patent number: 4488992
    Abstract: A disperse dye of the formula, ##STR1## wherein R.sub.1 is an alkyl group having 5 to 6 carbon atoms, R.sub.2 is an alkyl group having 5 to 6 carbon atoms, a cyano-ethyl group, R.sub.3 is a hydrogen atom or a lower alkyl, amino or phenyl group, and Y.sub.1 and Y.sub.2 represent independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, a nitro group, a cyano group, a thiocyanate group or an alkylsulfonyl group, provided that both Y.sub.1 and Y.sub.2 are not hydrogen at the same time and Y.sub.1 is located at the 4- or 5-position, which is useful for dyeing hydrophobic fibers in brilliant red to violet shade with good fastnesses.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: December 18, 1984
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kenji Yoshinaga, Kiyoyasu Hashimoto, Tetsuo Okaniwa, Hirohito Kenmochi
  • Naphthostyril cationic dyes
    Patent number: 3974178
    Abstract: A compound of the formula (I): ##SPC1##whereinR.sub.1 is a C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.2 alkoxy- or cyano-substituted C.sub.1 -C.sub.4 alkyl,R.sub.2 is a C.sub.1 -C.sub.4 alkyl, phenyl, C.sub.1 -C.sub.2 alkoxy-substituted phenyl, C.sub.7 -C.sub.8 aralkyl or cyclophenyl,R.sub.3 is a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy-substituted C.sub.1 -C.sub.2 alkyl or phenoxy-substituted C.sub.1 -C.sub.2 alkyl,X is hydrogen, a halogen or N,N--di--C.sub.1 -C.sub.4 alkylsulfonamide,Y is hydrogen, a C.sub.1 -C.sub.2 alkyl or a halogen,n is an integer of from 1 to 2, andZ.sup.- is an anion,Which is useful for dyeing acid modified polyacrylonitrile, polyester or polyamide fibers with a high fastness and an excellent vividness.
    Type: Grant
    Filed: March 21, 1973
    Date of Patent: August 10, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masaaki Ohkawa, Seizo Konishi, Kazuyoshi Hirabayashi, Sadaharu Abeta, Tetsuo Okaniwa, Yoshiro Takeda
  • Dischargeable black dyeing on acid modified polyester fiber
    Patent number: 3958287
    Abstract: A process to dye acid modified polyester fibers, such as Dacron T-64 fibers, a dischargeable black by dyeing the fibers with a mixture of six different basic dyes.
    Type: Grant
    Filed: May 27, 1975
    Date of Patent: May 25, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Tetsuo Okaniwa, Sadaharu Abeta
  • Black-dyeing process of basic dyeable polyester fibers
    Patent number: 3948598
    Abstract: Basic dyeable polyester fibers are dyed with a mixture of dyes, the first of which is a quaternized-2-methylene indoline coupled to a substituted aminobenzene to form a hydrazide dye, the second of which is a quaternized amino triazol azo coupled to substituted diaminobenzene. The third dye is a quaternized alkoxybenzothiazol azo coupled to a substituted Di-Aminobenzene. The fourth dye is a substituted diaminotriphenyl methane dye and the last dye is a Nitrobenzeneazo-substituted aminobenzene.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: April 6, 1976
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Tetsuo Okaniwa, Sadaharu Abeta