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:
Mar. 27, 1990
Filed:
Jul. 31, 1987
Takamitsu Asai, Odawara, JP;
Masaaki Fujiyama, Odawara, JP;
Fuji Photo Film Co., Ltd., Minami-Ashigara, JP;
Abstract
A magnetic recording medium whose output is increased over a wide range of from long wavelengths to short wavelengths and whose output fluctuation with rotation period is decreased when rotating and reproducing in the form of a disk is provided comprising a non-magnetic support and a magnetic layer provided thereon containing a ferromagnetic substance, the magnetic layer having a multilayer structure consisting of a lower layer containing a ferromagnetic substance in an ellipsoidal shape with ##EQU1## and a saturation magnetization of at least 60 emu/g and an upper layer containing a ferromagnetic substance of plate-shaped hexagonal system having the axis of easy magnetization in the vertical direction to the plate surface.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile