Patents by Inventor Atsushi Wakata

Atsushi Wakata 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).

  • Recording material containing carbonaceous powder whose surface is modified with fluorine gas
    Patent number: 5498281
    Abstract: The present invention provides a recording material containing a carbonaceous powder whose surfaces are modified with a fluorine gas. Even when the recording material of the present invention is stored for a long period of time, a carbonaceous powder such as a graphite powder or carbon black neither coheres nor precipitates. For example, even if the recording material of the present invention is used in a felt pen or a ball-point pen, the carbonaceous powder does not cohere in the container or the pen point, and therefore any clogging does not occur in the pen point and good writing is possible.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: March 12, 1996
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Hiroyuki Idogawa, Atsushi Wakata, Nobuatsu Watanabe, Yong-Bo Chong
  • Recording material containing carbonaceous powder whose surface is modified with fluorine gas
    Patent number: 5437715
    Abstract: The present invention provides a recording material containing a carbonaceous powder whose surfaces are modified with a fluorine gas. Even when the recording material of the present invention is stored for a long period of time, a carbonaceous powder such as a graphite powder or carbon black neither coheres nor precipitates. For example, even if the recording material of the present invention is used in a felt pen or a ball-point pen, the carbonaceous powder does not cohere in the container or the pen point, and therefore any clogging does not occur in the pen point and good writing is possible.
    Type: Grant
    Filed: August 3, 1993
    Date of Patent: August 1, 1995
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Hiroyuki Idogawa, Atsushi Wakata, Nobuatsu Watanabe, Yong-Bo Chong