Ball-point pen refill
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United States of America Patent
Stats
-
Aug 9, 2005
Grant Date -
Apr 8, 2004
app pub date -
Dec 28, 2001
filing date -
Jan 10, 2001
priority date (Note) -
Expired
status (Latency Note)
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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.
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