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. 04, 1997
Filed:
Jul. 27, 1995
Keitaro Yamashita, Saitama, JP;
Takeshi Satoh, Saitama, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A method for treating a magnet roll including the steps of providing a permanent magnet member having an outer circumferential surface and a plurality of axially extending magnetic poles formed in the outer circumferential surface, slidably surrounding the member with a non-magnetic metal sleeve of hollow cylindrical shape, the sleeve and the member being rotatable relative to each other, blasting a surface of the sleeve with spherical particles of a non-magnetic material having a density in a range of from 3 to 4 g/cm.sup.3 and Mohs' hardness in a range of from 11 to 14 to produce a surface roughness (R.sub.z) in a range of from 0.5 to 8 .mu.m.