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:
May. 13, 2008
Filed:
Feb. 14, 2003
Yasuyuki Yoshimura, Osaka, JP;
Norimasa Kurihara, Osaka, JP;
Atsushi Sudo, Osaka, JP;
Norihiro Hirano, Higashiosaka, JP;
Isao Enjon, Kobe, JP;
Yasuyuki Yoshimura, Osaka, JP;
Norimasa Kurihara, Osaka, JP;
Atsushi Sudo, Osaka, JP;
Norihiro Hirano, Higashiosaka, JP;
Isao Enjon, Kobe, JP;
Sakura Color Products Corporation, Osaka-Fu, JP;
Abstract
An erasable ink composition comprising water, a water-soluble organic solvent, and the following colorant, colorless resin particles and shear-thinning, viscosity-adjustment agent, characterized in that the colorless resin particles have a mean particle diameter smaller than that of the colorant and are contained in an amount larger than that of the colorant: (a) 3 to wt % (based on the whole ink) of colorless resin particles which are made of at least one resin selected from among acrylic resins, urethane resins, silicone resins and melamine resins and have a mean particle diameter of 0.10 to 10 μm, (b) 1 to 40 wt % (based on the whole ink) of a colorant having a mean particle diameter of 2 μm or above, and (c) 0.01 to 4 wt % (based on the whole ink) of a shear thinning, viscosity-adjustment agent.