Patents by Inventor Koichi Touma

Koichi Touma 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).

  • Substrate for ink jet head, ink jet head provided with said substrate and ink jet apparatus having such ink jet head
    Patent number: 5992980
    Abstract: There is provided an ink jet head which includes an electrothermal converting body disposed along a pathway of ink, said electrothermal converting body being provided with a heat generating resistor capable of generating, upon energization, heat energy to be directly applied to ink on a heat acting face whereby discharging said ink, characterized in that said heat generating resistor is composed of a material containing at least Ir and other one specific element at the specific respective composition rates or a material containing at least Ir and other two specific elements at the specific respective composition rates, said heat generating resistor constituted by any of said materials being capable of exhibiting a sufficient durability even in the case of driving the ink jet head with a relatively long drive pulse duration.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: November 30, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenji Hasegawa, Isao Kimura, Atsushi Shiozaki, Koichi Touma
  • Substrate for ink jet head, ink jet head provided with said substrate and ink jet apparatus having such ink jet head
    Patent number: 5477252
    Abstract: There is provided an ink jet head which includes an electrothermal converting body disposed along a pathway of ink, said electrothermal converting body being provided with a heat generating resistor capable of generating, upon energization, heat energy to be directly applied to ink on a heat acting face whereby discharging said ink, characterized in that said heat generating resistor is composed of a material containing at least Ir and other one specific element at the specific respective composition rates or a material containing at least Ir and other two specific elements at the specific respective composition rates, said heat generating resistor constituted by any of said materials being capable of exhibiting a sufficient durability even in the case of driving the ink jet head with a relatively long drive pulse duration.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: December 19, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenji Hasegawa, Isao Kimura, Atsushi Shiozaki, Koichi Touma