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:
Sep. 15, 1992
Filed:
Sep. 26, 1989
Yoshihiro Shiroishi, Hachioji, JP;
Takeo Yamashita, Tachikawa, JP;
Sadao Hishiyama, Sayama, JP;
Noriyuki Kumasaka, Ome, JP;
Yoshibumi Matsuda, Kokubunji, JP;
Hiroyuki Suzuki, Kawasaki, JP;
Kazumasa Takagi, Nishitama, JP;
Norikazu Tsumita, Kanagawa, JP;
Masaki Ohura, Odawara, JP;
Tomoyuki Ohno, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed are longitudinal recording media comprising a composite magnetic film formed on a nonmagnetic substrate directly or through a nonmagnetic underlayer, in which all of magnetic thin films constituting the composite magnetic film are magnetically connected, the composite magnetic film has a single in-plane coercivity, and the in-plane coercivity is greater than the in-plane coercivity of a longitudinal magnetically anisotropic magnetic thin film constituting a magnetic thin film nearest to an information recording side among the magnetic thin films constituting the composite film.