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:
Nov. 28, 2006
Filed:
Jul. 21, 2004
Takeshi Kobayashi, Yokohama, JP;
Takeshi Kobayashi, Yokohama, JP;
Mitsubishi Pencil KabushikiKaisha, Tokyo, JP;
Abstract
A writing implement, wherein elements forming a reverse flow prevention mechanism are formed in rather simple shapes and assembly process for the reverse flow prevention mechanism is rather simplified. The reverse flow prevention mechanism () comprises a valve chamber (), an inflow port () opened to the ink storage part () side of the valve chamber (), an outflow port () opened to the writing tip () side of the valve chamber (), a valve element () stored in the valve chamber (), a restricting body () stored in the valve chamber () at a position on the outflow port () side of the valve element (), and a valve seat () formed around the inflow port (). When the writing tip () is faced upward, the inflow port () is closed by the valve element (), and when faced downward, the valve element () is allowed to touch the restricting body () and does not reach the outflow port ().