Writing ball, method for manufacturing writing ball, and ballpoint pen with writing ball

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12220937
APP PUB NO 20240416673A1
SERIAL NO

18712910

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A writing ball capable of suppressing wear of a ball seat of a ballpoint pen tip and obtaining stable ink outflow, a writing ball that is a sphere, the sphere comprising, at least: a first hard component containing a first metal; a second hard component containing a second metal; and a binding component, the writing ball comprising: a first outer surface from which the first hard component is exposed, the first outer surface being an outermost surface of the sphere; and a recess including, as a bottom surface, a second outer surface from which the second hard component is exposed, the second outer surface being recessed inward from the first outer surface, wherein the first outer surface includes a smooth surface.

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First Claim

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Patent Owner(s)

  • KABUSHIKI KAISHA PILOT CORPORATION

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takayama, Kouichi Tokyo, JP 5 9

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