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:
Jan. 05, 2010
Filed:
Jun. 23, 2006
Shinichi Konno, Honjou, JP;
Toshihiko Ueyama, Okayama, JP;
Kenichi Inoue, Hirosaki, JP;
Takayuki Yoshida, Okayama, JP;
Ken Inoue, Okayama, JP;
Shinichi Konno, Honjou, JP;
Toshihiko Ueyama, Okayama, JP;
Kenichi Inoue, Hirosaki, JP;
Takayuki Yoshida, Okayama, JP;
Ken Inoue, Okayama, JP;
Dowa Electronics Materials Co., Ltd., Tokyo, JP;
Abstract
Non-magnetic powder of particles for non-magnetic lower layer applications is provided that enables a multilayer coating type magnetic recording medium having good surface smoothness to be obtained. The particles are iron compound particles having a long axis with a standard geometrical deviation, as obtained from a transmission electron microscope image, that is greater than 1.5, and a short axis with a standard geometrical deviation, as obtained from a TEM image, that is greater than 1.35. The iron compound particles may be hematite or iron oxyhydroxide.