Writing instrument

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11148460
APP PUB NO 20190193454A1
SERIAL NO

16327176

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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To provide a writing instrument capable of further improving durability of a writing nib without impairing writing performance even when writing is performed with a heavy writing load. A writing instrument A having a writing part formed of at least a writing nib 30 made of a porous body and a retainer 40 made of a hard material, in which the protrusion amount of the distal end of the writing nib 30 from the retainer 40 is 0.65 mm or more and 1.05 mm or less and/or 40% or more and 65% or less of the thickness of the writing nib 30.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI PENCIL COMPANY LIMITED5-23-37 HIGASHI-OHI SHINAGAWA-KU TOKYO 1408537 ?1408537

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirano, Kouichi Gunma, JP 10 500
Kamitani, Toshimi Kanagawa, JP 28 93
Sawa, Yukinori Gunma, JP 6 45
Suzuki, Hitoshi Kanagawa, JP 446 10083

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