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. 10, 1996
Filed:
Jun. 01, 1994
Applicant:
Inventors:
Nobuo Imazeki, Iwate-ken, JP;
Minoru Kanda, Saitama-ken, JP;
Tatsushi Shimizu, Saitama-ken, JP;
Kazuhiro Saito, Saitama-ken, JP;
Assignee:
Japan Energy Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360119 ; 360125 ;
Abstract
At least the first chamfered portion 22 for forming the apex portion 8 has a surface roughness (R.sub.p-p) of 0.6 .mu.m or under. This first chamfered portion 22 is formed through grinding with a #2500 or #1500 grinding stone.