Patents by Inventor Tsunehiko Ishi

Tsunehiko Ishi 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 pouch
    Patent number: D673214
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: December 25, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Tetsu Morino, Tsunehiko Ishi
  • Ink cartridge
    Patent number: D678406
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: March 19, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Yonekawa, Tetsu Morino, Tsunehiko Ishi
  • Ink cartridge
    Patent number: D678407
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: March 19, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Yonekawa, Tetsu Morino, Tsunehiko Ishi