Patents by Inventor Masahisa Maki

Masahisa Maki 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).

  • Ballpoint pen tip and ballpoint pen using the same
    Patent number: 6341914
    Abstract: A ballpoint pen tip 1 and also a ballpoint pen 7 or 8 using the same. A ballpoint pen tip 1, according to the invention, rotatably holds a ball 5 at its front end portion. The ball 5 is held by a plurality of inwardly projecting portions 3 (as a ball receiving seat) and a front end edge portion 4. The projecting portion 3 are formed by inwardly pressing and deforming a neighborhood of a front end portion of a metallic pipe body 2. The front end edge portion 4 is formed by inwardly pressing and deforming the front end portion of the pipe body 2. In the ballpoint pen tip according to the present invention, a relation of A/T>5.8 is satisfied, where A is an outer diameter of the ball 5 and T is a thickness of the pipe body 2.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: January 29, 2002
    Assignee: The Pilot Ink Co., Ltd.
    Inventors: Hiroyasu Abe, Masahisa Maki
  • Ballpoint pen tip and ballpoint pen using the same
    Publication number: 20010046408
    Abstract: The present invention relates to a ballpoint pen tip 1 and also a ballpoint pen 7 or 8 using the same. A ballpoint pen tip 1, according to the invention, rotatably holds a ball 5 at its front end portion. The ball 5 is held by a plurality of inwardly projecting portions 3 (as a ball receiving seat) and a front end edge portion 4. The projecting portion 3 are formed by inwardly pressing and deforming a neighborhood of a front end portion of a metallic pipe body 2. The front end edge portion 4 is formed by inwardly pressing and deforming the front end portion of the pipe body 2. In the ballpoint pen tip according to the present invention, a relation of A/T >5.8 is satisfied, where A is an outer diameter of the ball 5 and T is a thickness of the pipe body 2.
    Type: Application
    Filed: April 27, 2001
    Publication date: November 29, 2001
    Inventors: Hiroyasu Abe, Masahisa Maki
  • Cap for writing equipment
    Patent number: 4844642
    Abstract: The cap for writing equipment comprises an air vent in the top portion, means installed on the inner peripheral surface for providing airtightness, a miniature cap movably enclosed in the axial direction in a space formed with the top face, the inner peripheral face and an annular boss for providing airtightness, a resilient seal positioned on the outside of the top of the miniature cap for blocking the ventilation between the air vent and the inside of the cap when the tip of the pen body is fitted into the cap and rebounders for pressing the miniature cap against the pen body. The annular boss for providing airtightness is so positioned as to block the ventilation in the longitudinal direction by forcing itself to contact the trunk of the pen when the tip of the pen body is fitted into the cap.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: July 4, 1989
    Assignee: Pilot Ink Co., Ltd.
    Inventors: Takao Inaba, Kenji Sakai, Tadao Iida, Masahisa Maki
  • Ball-point pen
    Patent number: D452527
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: December 25, 2001
    Inventors: Masahisa Maki, Masayuki Tsuchida