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:
Feb. 11, 2020
Filed:
Dec. 22, 2016
Applicant:
Kabushiki Kaisha Pilot Corporation, Tokyo-to, JP;
Inventors:
Takumi Kajiwara, Kanagawa-ken, JP;
Naoto Masushige, Kanagawa-ken, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B43K 7/03 (2006.01); B43K 1/08 (2006.01); B43K 7/12 (2006.01); B43K 7/10 (2006.01); C09D 11/18 (2006.01); C09D 11/17 (2014.01);
U.S. Cl.
CPC ...
B43K 7/03 (2013.01); B43K 1/08 (2013.01); B43K 7/10 (2013.01); B43K 7/12 (2013.01); C09D 11/17 (2013.01); C09D 11/18 (2013.01);
Abstract
A writing instrument excellent in handwriting density and temporal stability. The writing instrument includes a ball-point pen tip attached to the front end portion of the ink storage cylinder; and a ball-point pen refill having an ink composition for a writing instrument loaded therein. The ink composition for the writing instrument is a thermochromic ink containing at least a thermochromic microcapsule pigment. The writing instrument includes a pressurization mechanism for applying a pressure to the back end of the ink composition for the writing instrument.