The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 2005
Filed:
Dec. 28, 2001
Takayuki Maki, Yokohama, JP;
Kiyoshi Fujisawa, Yokohama, JP;
Takayuki Maki, Yokohama, JP;
Kiyoshi Fujisawa, Yokohama, JP;
Mitsubishi Pencil Kabushikikaisha, Tokyo, JP;
Abstract
For producing a pressurized ball-point pen refill the ball-point pen refill includes a tip, an ink storage tube and a tail plug, wherein ink is filled in the space of the ink storage tube relatively near to the tip, and a pressuring gas is filled in the space of the ink storage tube relatively far from the tip. The tip includes a ball and a holder, and the ball is formed to have a surface roughness (Ra) of 0.010 μm to 0.080 μm. The holder has a ball house and an ink guiding groove, and the ball house has a side part and a bottom part. Moreover, a formula 1.01≦φB/φA ≦1.11 is satisfied when φA is the diameter of the ball, and φB is the inner diameter of the side part of the ball house.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile