Patents by Inventor Seishi Izumi

Seishi Izumi 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 follower for writing tool
    Patent number: 6478496
    Abstract: An ink follower for a writing tool arranged in close contact with an ink surface of a terminal portion of an ink reservoir opposite to a writing tip portion comprises a swollen gel formed from an oil-absorbable resin, a base oil of polybutene, and an alkyl-modified silicone oil compatible with the polybutene. The ink follower exhibits improved impact resistance without causing insufficient ink following and oil separation.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: November 12, 2002
    Assignee: Kabushiki Kaisha Pilot
    Inventors: Kazuhiro Yoshii, Seishi Izumi, Teruaki Fukasawa
  • Ink follower in conjunction with ink in a writing instrument and writing instrument containing the same
    Patent number: 6454481
    Abstract: An ink follower for a writing tool comprises a swollen gel formed from an oil-absorbable resin and a base oil, i.e., a hardly volatile liquid and/or a nonvolatile liquid. The ink follower is arranged in contact with the ink surface of a writing tool such as a pen. A writing tool using the ink follower has excellent impact resistance without causing insufficient following and oil separation with the passage of time and with no occurrence of inconvenience in writing.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: September 24, 2002
    Assignee: Kabushiki Kaisha Pilot
    Inventor: Seishi Izumi