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:
Apr. 30, 2013
Filed:
Feb. 22, 2012
Keishi Okamoto, Hiroshima, JP;
Satoru Ando, Hiroshima, JP;
Tatsuyuki Nakatani, Hiroshima, JP;
Yuki Nitta, Hiroshima, JP;
Kunihiro Toyota, Kanagwa, JP;
Kouichi Takayama, Kanagawa, JP;
Takumi Kajiwara, Kanagawa, JP;
Hirotaka Masuda, Kanagawa, JP;
Keishi Okamoto, Hiroshima, JP;
Satoru Ando, Hiroshima, JP;
Tatsuyuki Nakatani, Hiroshima, JP;
Yuki Nitta, Hiroshima, JP;
Kunihiro Toyota, Kanagwa, JP;
Kouichi Takayama, Kanagawa, JP;
Takumi Kajiwara, Kanagawa, JP;
Hirotaka Masuda, Kanagawa, JP;
Kabushiki Kaisha Pilot Corporation, Tokyo, JP;
Abstract
A ballpoint pen tip includes a ball and a ball holder for rotatably holding the ball. The ball includes a ball body and a first carbonaceous film formed so as to cover a surface of the ball body. The first carbonaceous film has carbon atoms and oxygen atoms bonded to some of the carbon atoms. The ratio of carbon atoms bonded to oxygen atoms to the total carbon atoms at a surface of the first carbonaceous film is equal to or greater than 0.1.