Patents by Inventor Seikichi Yanagita

Seikichi Yanagita 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).

  • Fountain pen equipped with a resiliency adjustment device
    Patent number: 4347011
    Abstract: A fountain pen in which the resiliency of the pen tip is continuously variable. The pen tip and core are surrounded at their mounting end by a pen core cover. A guide slot is formed in a guide portion of the cover in which is positioned a flexible tongue-shaped retaining member which arches from the slot towards the pen point. A knob extends from the mounting portion of the retaining member into a spiral groove in the inner surface of a rotatable cylindrical adjustment sleeve. Rotation of the sleeve moves the retaining member in and out to thereby adjust the resiliency of the tip.
    Type: Grant
    Filed: November 9, 1979
    Date of Patent: August 31, 1982
    Assignee: Pilot Man-Nen-Hitsu Kabushiki Kaisha
    Inventor: Seikichi Yanagita