Patents by Inventor Minoru Akagi

Minoru Akagi 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).

  • Trisazo compounds useful in producing water-resistant ink compositions
    Patent number: 4734489
    Abstract: An azo compound of the formula: ##STR1## wherein R is of the formula: ##STR2## R.sub.1 is hydrogen, methyl or --SO.sub.3 M; R.sub.2 is hydrogen or --SO.sub.3 M; R.sub.2 is hydrogen or --SO.sub.3 M; R.sub.3 is C.sub.4 -C.sub.18 alkyl and M is hydrogen, an alkali metal, ammonium or organic ammonium, provided that when R includes --SO.sub.3 M, R.sub.1 l and R.sub.2 are not --SO.sub.3 M, and when R does not include --SO.sub.3 M, either one of R.sub.1 and R.sub.2 is --SO.sub.3 M, which is useful as a black dyestuff for a solvent type ink composition, particularly for ink jet recording.
    Type: Grant
    Filed: March 27, 1986
    Date of Patent: March 29, 1988
    Assignees: Taoka Chemical Company, Limited, Sumitomo Chemical Company, Limited
    Inventors: Shinjiro Kawasaki, Hideo Kitagawa, Yutaka Nishii, Hideo Kawashita, Minoru Akagi