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:
Mar. 31, 1987
Filed:
Sep. 06, 1985
Applicant:
Inventor:
Haruo Yoshida, Kyoto, JP;
Assignee:
Kyocera Kabushiki Kaisha, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B43K / ;
U.S. Cl.
CPC ...
401215 ; 401209 ;
Abstract
This invention relates to a ball-point pen ball made of nonoxide ceramic and formed into a spherical body whose surface contains voids each having an average pore diameter of less than 75 .mu.m and more than 0.1 .mu.m. The ball thus made is not only almost free from 'ball sunk', 'nonuniformity in writing line thickness', 'ball break', etc. but also excellent in affinity with ink and assures steady writing characteristic over a long period of time.