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:
Nov. 13, 2002
Applicant:
Inventors:
Kazuhiko Furukawa, Kouza-gun, JP;
Yojiro Sano, Setagaya-ku, JP;
Assignee:
Mitsubishi Pencil Kabushiki Kaisha, Shinagawa-Ku, JP;
Primary Examiner:
Int. Cl.
CPC ...
B43K 5/18 ;
U.S. Cl.
CPC ...
B43K 5/18 ;
Abstract
In a free-ink type collector writing instrument, a collector ( ) is formed with a passage hole ( ) for providing commutation between the interior and the outside air so as to prevent the point assembly from being affected by the variation in inner pressure upon freezing or upon increase or decrease in pressure. At the same time, the passage hole is constructed in a shape so as not to present a stronger capillary attraction than that of an air/liquid exchanger ( ) and than that of an ink feeder portion ( ), whereby the problem of exudation leakage over time can be prevented.