Patents by Inventor Takahiko Shimizu

Takahiko Shimizu 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).

  • Writing instrument
    Patent number: 4364684
    Abstract: A writing instrument comprises a writing nib having a writing tip at one end and an enlarged head portion at the other end, and a resilient seat urging the head portion of the nib toward a tip of the instrument. The nib is movably secured in a nib holder body in such a manner that a writing pressure enables the nib to move backward against the resilient force of the seat to form an ink-feed space between the head portion and the nib holder body. When the writing instrument is not in use, the head portion is engaged with the nib holder body to close the ink-feed space.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: December 21, 1982
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Tadashi Kohno, Takahiko Shimizu, Kenji Takahashi, Hishao Fukui, Akio Okubo, Noriaki Masuda