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. 11, 1995
Filed:
Dec. 17, 1993
Applicant:
Inventor:
Atsushi Maeda, Ibaraki, JP;
Assignees:
Research Development Corp. of Japan, Tokyo, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 360 59 ;
Abstract
The invention provides a medium and a method suitable for magneto-optical and multiple recording. The medium includes alternate thin layers of a magnetic rare-earth metal and an electrically conductive material, and has 'magnetic frozen state' at low temperature. The medium may be magnetized to different ferromagnetic states when heated to different temperatures by a controlled laser beam, under an external magnetic field. The different magnetic states permit of multiple recording.