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. 20, 1999
Filed:
Jun. 05, 1997
Kazuhiko Suzuki, Miyagi, JP;
Masahiro Sawaguchi, Miyagi, JP;
Satsuki Yamada, Miyagi, JP;
Yuko Abe, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
There is disclosed a magnetic recording medium which are not only excellent in chemical and magnetic stability, durability and traveling reliability but also has a good time index function. The magnetic recording medium according to the present invention includes a non-magnetic substrate and a magnetic layer formed on the non-substrate, the magnetic layer being composed mainly of .gamma.--Fe.sub.2 O.sub.3 and having a coercive force of 25 to 33 KA/m, a residual magnetic flux density of not less than 130 mT and a thickness of 1.5 to 2.0 .mu.m, wherein the magnetic recording medium has a total thickness of not more than 6 .mu.m, and is capable of recording thereon and/or reproducing therefrom a low frequency signal.