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:
Jul. 03, 1990
Filed:
Mar. 23, 1988
Kazuetsu Yoshida, Kodaira, JP;
Yoshihiro Shiroishi, Hachioji, JP;
Makoto Saito, Tokyo, JP;
Norikazu Tsumita, Kanagawa, JP;
Takeo Yamashita, Tachikawa, JP;
Hiroyuki Suzuki, Kawasaki, JP;
Yasushi Kitazaki, Odawara, JP;
Masaki Ohura, Odawara, JP;
Sadao Hishiyama, Sayama, JP;
Tomoyuki Ohno, Kokubunji, JP;
Yoshibumi Matsuda, Kokubunji, JP;
Kazumasa Takagi, Tokyo, JP;
Katsuhiro Kuroda, Hachioji, JP;
Sadanori Nagaike, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed are a magnetic recording medium having a magnetic recording layer formed of a magnetic thin film in which rotational hysteresis integral R.sub.H is within a range of from 0.4 to 1.3 in the measurement by a torque magnetometer, and a continuous magnetic recording medium in which crystal grains are substantially randomly arranged on the upper surface of a magnetic recording layer or on the surface of a non-magnetic subbing layer, and in which each of the crystal grains is made to be in the form of an ellipsoid or needle and to have a length-ways axial ratio of a major axis to a minor axis not smaller than 2, more preferably, not smaller than 4.