Patents by Inventor Shigehiro Sasaki

Shigehiro Sasaki 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).

  • Porous rubber stamp material having open cells
    Patent number: 5620777
    Abstract: A porous rubber stamp material having open cells is here disclosed which comprises a print layer 2 having a spring hardness of 30 to 40 and an ink-occluding layer 1 having a spring hardness of 10 to 20, and preferably, the ink-occluding layer 1 is provided with lugs 3. The porous rubber stamp material of the present invention can overcome faults of a conventional porous rubber stamp material having open cells and permits obtaining a very sharp imprint under any push pressure. Thus, the porous rubber stamp material of the present invention can be used for the continuous sealing of a private seal, an address seal, a date seal and the like.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: April 15, 1997
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Kazumi Goto, Shigehiro Sasaki