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:
Nov. 05, 1991
Filed:
Oct. 02, 1990
Kenichi Yoden, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
Disclosed are (1) methods for treating ferromagnetic metal powders which comprise synthesizing the ferromagnetic metal powders, and then exposing the ferromagnetic metal powders to plasma in an oxygen atmosphere, and (2) magnetic recording media comprising non-magnetic supports and magnetic layers formed thereon, the magnetic layers being mainly composed of ferromagnetic metal powders and binder resins, in which the ferromagnetic metal powders are treated by the methods described in (1). The ferromagnetic metal powders obtained by the above methods are excellent in oxidation stability, and the magnetic recording media using the above ferromagnetic metal powders are excellent in storage stability.