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. 02, 1996
Filed:
Jun. 20, 1994
Applicant:
Inventors:
Yoshihiro Honjo, Saku, JP;
Yoshisuke Yamakawa, Niiza, JP;
Hiroshi Kawahara, Saku, JP;
Eizo Tsunoda, Komoro, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B32B / ; B32B / ;
U.S. Cl.
CPC ...
428141 ; 428332 ; 428336 ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 427128 ; 427131 ;
Abstract
A magnetic recording medium records two or more signals having different frequency bands by frequency multiplex recording. The non-magnetic substrate includes a first magnetic layer and a second magnetic layer on that order, said second magnetic layer having a thickness amounting to 70% or less of the shortest recording wavelength of the signals to be recorded.