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. 20, 2007
Filed:
Dec. 27, 2002
Masaru Miyamoto, Yokohama, JP;
Yoji Takeuchi, Yokohama, JP;
Masaru Miyamoto, Yokohama, JP;
Yoji Takeuchi, Yokohama, JP;
Mitsubishi Pencil Kabushiki Kaisha, Tokyo, JP;
Abstract
An ink follower for a ballpoint pen using a water-based ink in which a value of the test for oil separation (60° C., 24 hours) according to JIS K 2220-5.7-1993 is 0.5 to 12% and which has a viscoelasticity predominant in an elastic response or a value of tan δ of 0.1 to 1.5 at a temperature of 25° C. and in the full frequency range of an angular frequency of 0.1 to 630 rad/sec, and it contains as a base oil, a non-water-soluble organic solvent having a viscosity of 5 Pas·sec or less at a temperature of 25° C. and a shearing speed of 1 to 400 sec. Polybutene, mineral oil and silicone oil can be used as the base oil.