Ballpoint pen tip, ballpoint pen refill, and ballpoint pen

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United States of America Patent

PATENT NO 9056518
APP PUB NO 20120328356A1
SERIAL NO

13583473

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A ballpoint pen tip in which ink grooves are formed around an ink guide hole at equally distributed places, the ink guide hole connecting a ball house and a back hole of a holder for holding the writing ball, and the ink grooves radially penetrate through from the ball house side to the front end portion of the back hole. Inward protrusions are formed at positions which are respectively in contact with the rear ends of the ink grooves. If the inner diameter of the ink guide hole is A, the inner diameter of the front end portion of the back hole is B, the diameter of the circle circumscribing the ink grooves is C, and the diameter of the circle inscribing the inward protrusions is D, their relationships are A

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First Claim

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI PENCIL COMPANY LIMITED23-37 HIGASHI OHI 5-CHOME SHINAGAWA-KU TOKYO 140-8537

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishii, Yoshihide Yokohama, JP 8 65

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