Ballpoint pen tip, ballpoint pen refill, and ballpoint pen

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11975560
APP PUB NO 20230398807A1
SERIAL NO

18036995

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A ballpoint pen tip comprises: a ball having a diameter of 0.5 mm or less; and a tip body, wherein the tip body has a ball holding chamber, a rear hole, an ink flow hole, and an ink flow groove opening to the ball holding chamber, and not reaching the rear hole. A ratio of an ink consumption per 100 m of handwriting to a diameter of the ball is 200 mg/mm or more and 800 mg/mm or less, and when a front end of the ink flow groove is set as a start point and a position of 0.3 mm rearward from the front end of the ink flow hole is set as an end point, a volume of a first space in the ink flow hole and the ink flow groove from the start point to the end point is 0.02 mm3 or more.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA PILOT CORPORATION (ALSO TRADING AS PILOT CORPORATION)6-21 KYOBASHI 2-CHOME CHUO-KU TOKYO 1048304 ?1048304

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kajiwara, Takumi Tokyo-to, JP 6 9
Masushige, Naoto Tokyo-to, JP 6 4

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