Patents by Inventor Utazi Sawa

Utazi Sawa 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 producing aminoaryl-.beta.-sulfatoethylsulfone
    Patent number: 4482501
    Abstract: An improved process for producing sulfuric acid semiesters of the formula:NH.sub.2 -A--SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H).sub.nwherein A is a substituted or unsubstituted aromatic group, and n is an integer of 1 or 2, which are important as intermediates of the vinylsulfonic reactive dyes, said process comprising reacting a compound of the formula:B-NH-A--SO.sub.2 CH.sub.2 CH.sub.2 OH).sub.nwherein A and n are as defined above, and B is hydrogen or a group capable of being hydrolyzed by an acid, with an acid.
    Type: Grant
    Filed: June 16, 1982
    Date of Patent: November 13, 1984
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Nobuzi Nishimura, Utazi Sawa, Takemi Tokieda, Shun-ichi Hayakawa, Yasuo Tezuka
  • Process for producing aminoaryl-.beta.-sulfatoethylsulfone
    Patent number: 4346046
    Abstract: An improved process for producing sulfuric acid semiesters of the formula:NH.sub.2 --A--SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H).sub.nwherein A is a substituted or unsubstituted aromatic or heterocyclic group, and n is an integer of 1 or 2, which are important as intermediate of the vinylsulfonic reactive dyes, said process comprising reacting a compound of the formula:B--NH--A--SO.sub.2 CH.sub.2 CH.sub.2 OH).sub.norCO(NH--A--SO.sub.2 CH.sub.2 CH.sub.2 OH).sub.2wherein A and n are as defined above, and B is hydrogen or a group capable of being hydrolyzed by an acid, with an acid.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: August 24, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Nobuzi Nishimura, Utazi Sawa, Takemi Tokieda, Shun-ichi Hayakawa, Yasuo Tezuka
  • Disazo dye composition
    Patent number: 4257770
    Abstract: A dye composition comprising at least one disazo dye of the formula (I) expressed in the form of a free acid, ##STR1## wherein each X.sub.1 and X.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OCOCH.sub.3, --SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H or --SO.sub.2 CH.dbd.CH.sub.2, provided that at least one of X.sub.1 and X.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OCOCH.sub.3, and at least one disazo dye of the formula (II) expressed in the form of a free acid, ##STR2## Wherein each Y.sub.1 and Y.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H, --SO.sub.2 CH.dbd.CH.sub.2 or --SO.sub.2 CH.sub.2 CH.sub.2 OH, provided that one of Y.sub.1 and Y.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H or --SO.sub.2 CH.dbd. CH.sub.2, is produced by diazotizing a mixture of 4-aminophenyl-.beta.-sulfatoethylsulfone and 4-aminophenyl-.beta.acetoxyethylsulfone in a weight ratio of 30 to 70: 70 to 30 with a nitrite, and coupling the resulting mixture of the diazonium salts with 1-amino-8-naphthol-3,6-disulfonic acid.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: March 24, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Nobuzi Nishimura, Masayuki Tsuji, Seizo Konishi, Tadashi Yamamoto, Takemi Tokieda, Utazi Sawa, Suketsugu Koumura