The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 7070352 B1

Expired

Date of Patent:

Jul. 04, 2006

Filed:

Aug. 30, 2002

Writing implement

Applicants:

Hisashi Iida, Yokohama, JP;

Shigeru Okumura, Yokohama, JP;

Kazuaki Matsumoto, Yokohama, JP;

Seiichi Kobayashi, Yokohama, JP;

Takeshi Kobayashi, Yokohama, JP;

Yusuke Kobayashi, Yokohama, JP;

Yosuke Mito, Tokyo, JP;

Inventors:

Hisashi Iida, Yokohama, JP;

Shigeru Okumura, Yokohama, JP;

Kazuaki Matsumoto, Yokohama, JP;

Seiichi Kobayashi, Yokohama, JP;

Takeshi Kobayashi, Yokohama, JP;

Yusuke Kobayashi, Yokohama, JP;

Yosuke Mito, Tokyo, JP;

Assignee:

Mitsubishi Pencil Kabushikikaisha, Tokyo, JP;

Attorney:

Kubovcik & Kubovcik

Primary Examiner:

David J Walczak

Int. Cl.

CPC ...

B43K 5/02 (2006.01); B43K 5/12 (2006.01); B43K 5/00 (2006.01);

U.S. Cl.

CPC ...

Abstract

A writing implement includes a cylindrical shaft member, a pen tip member which is fixed to one end of the shaft member and from which colored ink seeps out, liquid for ink which is stored in the shaft member and which comprises a major component of the colored ink seeping out from an end of the pen tip member, colorant to be added to the liquid for ink, and a valve member for isolating the colorant from the liquid for ink. In the writing implement, at least a part of a cylindrical side surface of the shaft member corresponding to a part where the liquid for ink is stored is formed to be transparent, the valve member is positioned between the storing part of the liquid for ink and the colorant, and the storing part of the liquid for ink is provided with a pressure-regulating part.

Find Patent Forward Citations

Iida, Hisashi. (2006). Writing implement (U.S. Patent No. 7070352). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7070352

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