Patents by Inventor Koji Aburada

Koji Aburada 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).

  • Patent number: 5536819
    Abstract: A trisazo compound represented by the following formula (I) in the free acid form: ##STR1## wherein Q is an phenyl or naphthyl group both of which may be unsubstituted or substituted; one of the A and B is hydroxy group and the other is amino group; K is 1 or 2; and one of m and n is 1 and the other is 0; a method for dyeing fiber materials, paper or leather by using the trisazo compounds and an ink containing the trisazo compounds, and the trisazo compound is excellent in solubility, and good in storage stability and free from clogging of nozzle caused by deposition. The ink using the trisazo compound gives a deep black-colored image excellent in clarity, water-durability and durability to light.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: July 16, 1996
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yuriko Tamura, Kazuya Ogino, Mahito Fujita, Takashi Omura, Hideo Kawashita, Koji Aburada
  • Patent number: 5530105
    Abstract: A tetrakisazo compound represented by the following formula (1) in the free acid form: ##STR1## wherein Q.sub.1 and Q.sub.2 independently represent phenylene or naphthylene group which may be optionally substituted, R.sub.4, R.sub.5 and R.sub.6 independently represent a hydrogen atom, a halogen atom, a hydroxy group, a sulfonic acid group or an amino, alkyl, alkoxy, carbamoyl or sulfamoyl group which may be optionally substituted, m is 0 or 1 and n is 1 or 2, and an ink which comprises the tetrakisazo compound. The ink exhibit excellent properties for ink jet printing.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: June 25, 1996
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Satoshi Yamazaki, Hideo Kawashita, Koji Aburada, Kazuya Ogino, Yuriko Tamura, Takashi Omura
  • Patent number: 5489671
    Abstract: A trisazo compound represented by the following formula (1) in the free acid form: ##STR1## wherein Q' is phenylene group, Q.sup.2 is phenyl or naphtyl group, one of the A and B is a hydroxy group and the other is an amino group, K is 1 or 2, one of m and n is 1 and the other is 0, X and Y independently of one another are each --OR.sup.1, --SR.sup.2, --NR.sup.3 R.sup.4 or ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another are each a hydrogen atom, an alkyl, phenyl or naphthyl group; r is 1 or 2; and Z is --CH.sub.2 --, --O--, --SO.sub.2 -- or --NR.sup.5 -- wherein R.sup.5 is a hydrogen atom or C.sub.1 -C.sub.4 alkyl group;a method for dyeing fiber material, paper or leather by using the trisazo compound;and an ink which contains the trisazo compound and which is excellent in storage stability and can give a clear black printed image having excellent water resistance and light fastness.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: February 6, 1996
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuya Ogino, Yuriko Tamura, Takashi Omura, Mahito Fujita, Hideo Kawashita, Koji Aburada