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:
Jun. 10, 2025
Filed:
Dec. 14, 2022
Applicant:
Mitsubishi Pencil Company, Limited, Tokyo, JP;
Inventors:
Assignee:
MITSUBISHI PENCIL COMPANY, LIMITED, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B43K 1/12 (2006.01); B43K 23/08 (2006.01); B43K 23/12 (2006.01); C09D 11/16 (2014.01);
U.S. Cl.
CPC ...
B43K 1/12 (2013.01); B43K 23/08 (2013.01); B43K 23/12 (2013.01); C09D 11/16 (2013.01);
Abstract
A writing instrument in which condensation does not occur in a cap even though the writing instrument is equipped with the cap and which has high writing instrument quality and commercial value. The writing instrument includes at least a barrel in which an aqueous ink is contained; a pen tip provided on a tip side of the barrel and capable of discharging the aqueous ink; and a cap that is removably attached on a pen tip side of the barrel, wherein the aqueous ink has a vapor pressure of 10.3 to 12.3 kPa at 50° C.