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:
Jan. 24, 2023
Filed:
Oct. 23, 2018
Applicant:
Kabushiki Kaisha Pilot Corporation, Tokyo-to, JP;
Inventor:
Taro Tozuka, Tokyo-to, JP;
Assignee:
KABUSHIKI KAISHA PILOT CORPORATION, Tokyo-to, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09D 11/18 (2006.01); C09D 11/17 (2014.01); B43K 7/00 (2006.01);
U.S. Cl.
CPC ...
C09D 11/18 (2013.01); C09D 11/17 (2013.01); B43K 7/00 (2013.01);
Abstract
The present invention provides a water-based ink composition for a ballpoint pen that is less likely to cause bleeding of a written trace in writing, provides a favorable written trace without causing no blurring or line splitting, and excels in the storage stability of the ink composition; and a water-based ballpoint pen using the ink composition. A water-based ink composition for a ballpoint pen comprising water, a coloring agent, a copolymer having a specific structure; and a water-based ballpoint pen using the ink composition.