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. 24, 1999
Filed:
Jan. 28, 1998
Applicant:
Inventors:
Takayuki Ikai, Yokohama, JP;
Misao Oyama, Tokyo, JP;
Assignee:
Mitsubishi Pencil Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09D / ;
U.S. Cl.
CPC ...
106 3133 ; 106 3165 ;
Abstract
An ink for a ball point pen contains at least one or plural kinds of organic solvents, colorants and resins and further contains fine particle silica having a primary average particle diameter of 7 to 40 nm and a specific surface area (BET method) of 50 to 380 m.sup.2 /g. The ink for a ball point pen is prevented from leaking out of the pen tip, is not damaged smooth writing feeling and does not cause clogging at the pen tip.