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:
Nov. 05, 2024
Filed:
Mar. 01, 2024
Applicant:
Mitsubishi Pencil Company, Limited, Tokyo, JP;
Inventors:
Yusuke Nakata, Tokyo, JP;
Hisato Haga, Tokyo, JP;
Assignee:
MITSUBISHI PENCIL COMPANY, LIMITED, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B43K 8/02 (2006.01); C09D 11/17 (2014.01);
U.S. Cl.
CPC ...
B43K 8/02 (2013.01); C09D 11/17 (2013.01);
Abstract
A writing instrument may be capable of preventing dye deposition to a pen core and highly achieving both inhibition of ink discoloration due to the dye deposition and improved writing feeling without reducing writing performance. Such a writing instrument may be equipped with a pen core and loaded with a water-based ink composition, wherein the water-based ink composition contains colored resin particles formed by polymerization of a monomer comprising at least cyclohexyl (meth)acrylate, enclosing a basic dye, an oil-soluble dye or an acid dye, and further contains an anionic surfactant.