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:
Jul. 23, 2002
Filed:
Apr. 11, 2001
Applicant:
Inventors:
Kazuyuki Nishikita, Nara-ken, JP;
Hideji Yoshida, Nara-ken, JP;
Assignee:
Tsubaki Nakashima Co., Ltd., Nara-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 2/902 ;
U.S. Cl.
CPC ...
C22C 2/902 ;
Abstract
A ball for a ball-point pen is provided comprising cemented carbide of WC—Cr C —Co where VC is contained as a solid solution in the Cr C —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 &mgr;m. In one embodiment of the invention, a portion of the Cr C —VC—CO phase exposed on the surface of the ball comprises a plurality of concave recesses.