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:
Dec. 04, 2007
Filed:
Nov. 27, 2006
Yasuo Murakoshi, Saitama, JP;
Yasuo Murakoshi, Saitama, JP;
Tombow Pencil Co., Ltd., Tokyo, JP;
Abstract
a pen adapted to be pressurized and capable of being manufactured inexpensively, with which ink can be smoothly supplied and an excessive pressurization within an ink accommodating tube and the leakage of ink can be prevented, as well as a pen that can be easily used in a state that a pen tip is directed upwardly. The pen comprises a pressurizing pump mechanismwhich pressurizes an inside of ink accommodating tubeand includes a pressurizing chambercommunicating with the inside of the ink accommodating tube, an elastic spherical bodydisposed to be pushed into the pressurizing chamber, a compression springthat urges the spherical body in a direction to be released from within the pressurizing chamber, and a pressing stemthat moves the spherical body against the urging force of the compression spring into the pressurizing chamber in an airtight state.