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. 22, 1988
Filed:
Mar. 27, 1987
Yoshihiro Shiroishi, Hachioji, JP;
Sadao Hishiyama, Sayama, JP;
Hiroyuki Suzuki, Kokubunji, JP;
Norikazu Tsumita, Kanagawa, JP;
Tsuneo Suganuma, Tokorozawa, JP;
Yoshio Gobara, Hadano, JP;
Masaaki Hayashi, Odawara, JP;
Makoto Sano, Kanagawa, JP;
Takaaki Shirakura, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic recording medium comprises a non-magnetic substrate and a thin magnetic film, the thin magnetic film being composed mainly of Co, Ni and at least one of Zr and Hf, and a concentration of Zr, Hf or Zr and Hf as contained in the thin magnetic film being 0.1 to 30% by atom on the basis of the total of Co and Ni, and has a considerably higher corrosion resistance than that of the conventional magnetic recording medium having a thin Co-Ni magnetic film.