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:
Apr. 17, 2007
Filed:
Jan. 14, 2004
Tadaaki Oikawa, Nagano, JP;
Hiroyuki Uwazumi, Nagano, JP;
Takahiro Shimizu, Nagano, JP;
Naoki Takizawa, Nagano, JP;
Tadaaki Oikawa, Nagano, JP;
Hiroyuki Uwazumi, Nagano, JP;
Takahiro Shimizu, Nagano, JP;
Naoki Takizawa, Nagano, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
A magnetic recording medium has a non-magnetic under-layer, a magnetic layer, a protective film and a liquid lubricant layer sequentially laminated on a non-magnetic substrate. The magnetic layer has a multi-layer structure laminated with two or more magnetic layer components, each of the magnetic layer components having ferromagnetic grains and non-magnetic grain boundaries surrounding the grain. The resulting magnetic recording medium has a granular magnetic layer exhibiting very high Hc accompanying high density of magnetic recording, while decreasing the amount of platinum needed for attaining the high Hc, and reducing media noise accompanying the high recording density.