Patent Number: 6,332,728

Title: Ball for ball-point pen

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 .mu.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.

Inventors: Ito; Tadaaki (Osaka, JP), Nakatani; Yasunori (Osaka, JP), Ito; Atsushi (Osaka, JP), Yamamoto; Hiroyoshi (Osaka, JP)

Assignee: Sakura Color Products Corporation

International Classification: B43K 1/08 (20060101); B43K 1/00 (20060101); B43K 007/10 ()

Expiration Date: 12/25/2018