Patents by Inventor Sumio Manaka

Sumio Manaka 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).

  • Fluoran compound and coloring recording material using it
    Patent number: 5017710
    Abstract: Fluoran compounds represented by the general formula (I) ##STR1## (where R is an alkyl group having 9 to 12 carbon atoms) and coloring recording materials containing the said compounds as coloring components, and benzoic acid derivatives represented by the general formula (II) ##STR2## (where R is an alkyl group having 9 to 12 carbon atoms).
    Type: Grant
    Filed: October 24, 1989
    Date of Patent: May 21, 1991
    Assignee: Nippon Soda Co., Ltd.
    Inventors: Tetsuo Igaki, Akio Kaneko, Sumio Manaka, Kimiaki Kinoshita
  • Fluoran compound and color forming record materials using the same
    Patent number: 4668967
    Abstract: 3-N-isobutyl-ethylamino-7-phenylaminofluoran is a new green color former. It is used, together with an acidic substance, in color forming record materials for use in pressure sensitive copying paper, heat-sensitive recording paper and the like.
    Type: Grant
    Filed: May 28, 1986
    Date of Patent: May 26, 1987
    Assignee: Shin Nisso Kako Co., Ltd.
    Inventors: Masakichi Yahagi, Takeo Obitsu, Tetsuo Igaki, Kazuyuki Horisawa, Morio Nanbu, Kimiaki Kinoshita, Sumio Manaka