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. 31, 1999
Filed:
Jun. 26, 1998
Applicant:
Inventors:
Takao Koyama, Tano-gun, JP;
Yoshiomi Konose, Sawa-gun, JP;
Assignee:
Mitsubishi Pencil Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B43K / ;
U.S. Cl.
CPC ...
401227 ; 401225 ;
Abstract
A free ink type writing instrument using an ink containing an organic solvent as a main solvent, wherein a temporary ink reservoir member has a larger critical surface tension than a surface tension of the ink, and an absolute value of a difference between values of solubility parameters of a material constituting the temporary ink reservoir member and a solvent contained in the ink is 1 or more.