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.:
Date of Patent:
Oct. 19, 2021
Filed:
Aug. 24, 2017
Applicant:
Mitsubishi Pencil Company, Limited, Tokyo, JP;
Inventors:
Hitoshi Suzuki, Kanagawa, JP;
Kouichi Hirano, Gunma, JP;
Yukinori Sawa, Gunma, JP;
Toshimi Kamitani, Kanagawa, JP;
Assignee:
Mitsubishi Pencil Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B43K 8/02 (2006.01); B43K 1/00 (2006.01); B43K 1/12 (2006.01); B43K 1/01 (2006.01);
U.S. Cl.
CPC ...
B43K 1/01 (2013.01); B43K 1/00 (2013.01); B43K 1/006 (2013.01); B43K 1/12 (2013.01); B43K 8/02 (2013.01);
Abstract
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 nibmade of a porous body and a retainermade of a hard material, in which the protrusion amount of the distal end of the writing nibfrom the retaineris 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