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. 25, 2001
Filed:
Dec. 03, 1999
Applicant:
Inventors:
Tadaaki Ito, Osaka, JP;
Yasunori Nakatani, Osaka, JP;
Atsushi Ito, Osaka, JP;
Hiroyoshi Yamamoto, Osaka, JP;
Assignee:
Sakura Color Products Corporation, Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B43K 7/10 ;
U.S. Cl.
CPC ...
B43K 7/10 ;
Abstract
A ball for a ball-point pen is provided which is composed of a sintered material obtained by sintering hard particles and having an average inter-particle diameter of not greater than 0.2 &mgr;m. The gaps between the hard particles are very small and, therefore, very few minute fragments of the hard particles are exposed from binder metal portions on the surface of the ball and fall off to act as an abrasive during use of the ball-point pen. Thus, abrasion of a pen tip body and sinkage of the ball into the pen tip body can be prevented.