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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.:

US 8845799 B1

PDFFull Text
Date of Patent:
Sep. 30, 2014

Filed:

Aug. 16, 2010

Reversibly thermochromic aqueous ink composition, and writing instrument and writing instrument set each utilizing same

Applicant:

Katsuyuki Fujita, Aichi, JP;

Inventor:

Katsuyuki Fujita, Aichi, JP;

Assignee:

The Pilot Ink Co., Ltd., Aichi, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Veronica F Faison

Int. Cl.
CPC ...
C09D 11/16 (2014.01); C09D 11/00 (2014.01); B43K 8/04 (2006.01); B43L 19/00 (2006.01); B43K 8/02 (2006.01); B43K 23/12 (2006.01); C09B 67/10 (2006.01); C09B 67/46 (2006.01); B43K 25/02 (2006.01); C09D 5/26 (2006.01); C09B 67/02 (2006.01); B43K 8/03 (2006.01); C09D 7/12 (2006.01); C09D 11/17 (2014.01); B43K 29/02 (2006.01); B41M 5/30 (2006.01);
U.S. Cl.
CPC ...
C09D 11/17 (2013.01); B43K 8/04 (2013.01); B43L 19/0068 (2013.01); B43K 8/02 (2013.01); B43K 23/126 (2013.01); C09B 67/0014 (2013.01); C09B 67/009 (2013.01); B43K 25/022 (2013.01); C09D 5/26 (2013.01); C09B 67/0097 (2013.01); B43K 8/03 (2013.01); B41M 5/305 (2013.01); C09B 67/0085 (2013.01); C09D 7/1291 (2013.01); B43K 29/02 (2013.01);
Abstract

The present invention relates to a reversibly thermochromic aqueous ink composition comprising: water; a water-soluble organic solvent; a reversibly thermochromic microcapsule pigment which contains a reversibly thermochromic composition comprising: (A) an electron donating coloring organic compound, (B) an electron accepting compound, and (C) a reaction medium which determines temperature at which color reactions between the components (A) and (B) occur; a comb type polymer dispersant having carboxyl groups on its side chains, an organic nitrogen sulfur compound, and a water-soluble resin, a writing instrument using the ink composition, and a writing instrument set comprising the writing instrument and a frictional body.

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