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. 14, 2016
Filed:
Aug. 29, 2012
Applicants:
Aya Otsubo, Tokyo, JP;
Yoshitaka Morimoto, Tokyo, JP;
Yuichi Kobayashi, Tokyo, JP;
Natsumi Koide, Tokyo, JP;
Inventors:
Aya Otsubo, Tokyo, JP;
Yoshitaka Morimoto, Tokyo, JP;
Yuichi Kobayashi, Tokyo, JP;
Natsumi Koide, Tokyo, JP;
Assignee:
PENTEL KABUSHIKI KAISHA, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B43K 7/00 (2006.01); C09D 11/18 (2006.01); C09D 101/26 (2006.01); B43K 7/01 (2006.01); C08K 3/04 (2006.01); C09D 101/28 (2006.01); C09D 105/00 (2006.01); C09D 161/02 (2006.01);
U.S. Cl.
CPC ...
C09D 11/18 (2013.01); B43K 7/01 (2013.01); C08K 3/04 (2013.01); C09D 101/26 (2013.01); C09D 101/28 (2013.01); C09D 105/00 (2013.01); C09D 161/02 (2013.01);
Abstract
An oil-based ink composition for a ballpoint pen has an ink viscosity at 25° C. is 200,000 mPa·s or more at a shear rate of 0.019 sand 5,000 mPa·s or less at a shear rate of 10,000 sand a storage modulus at an angular frequency of 0.019 rad/sec is 10 Pa or more. The ink composition ensures a thin-width writing line, without bleeding or feathering, and prevents ink-depleted regions at the central part of the writing line so that the writing line is uniform and clear.