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:
Aug. 03, 2004
Filed:
Apr. 29, 1999
Applicant:
Inventor:
Masaru Miyamoto, Yokohama, JP;
Assignee:
Mitsubishi Pencil Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09D 1/100 ;
U.S. Cl.
CPC ...
C09D 1/100 ;
Abstract
A water based ink composition for a ballpoint pen which is comprises an alkali-swelling associative thickener comprising a polymer having a carboxyl group and a hydrophobic group, a pigment, a polar solvent containing water, a pH controlling agent and other additives. It is a water based ink composition which is stable over a long period of time without settling of the pigment itself and can be filled into a ballpoint pen having simplified ink free type structure as is the case with a ballpoint pen using an oil based ink.