Patents by Inventor Koichi Toma

Koichi Toma 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).

  • Ink jet recording method
    Patent number: 6252617
    Abstract: An ink directly contacts a heating resistor which forms a portion of an electrothermal transducer. The ink is ejected from orifices by using thermal energy generated by supplying an electric current to the heating resistor. The concentration of alkali metal ion is equal to or less than 5×10−3 mol/l.
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: June 26, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenji Hasegawa, Koichi Toma, Isao Kimura, Atsushi Shiozaki