Ball for ball-point pen
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United States of America Patent
Stats
-
Jul 23, 2002
Grant Date -
Mar 7, 2002
app pub date -
Apr 11, 2001
filing date -
Jul 19, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ball for a ball-point pen is provided comprising cemented carbide of WC--Cr.sub.3 C.sub.2 --Co where VC is contained as a solid solution in the Cr.sub.3 C.sub.2 --CO phase which is a binder of WC particles and wherein the mean diameter of the WC particles is in the range of from about 0.3 to about 0.5 .mu.m. In one embodiment of the invention, a portion of the Cr.sub.3 C.sub.2 --VC--CO phase exposed on the surface of the ball comprises a plurality of concave recesses.
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