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. 07, 1998
Filed:
Aug. 06, 1991
Applicant:
Inventors:
Yoshibumi Matsuda, Hachiouji, JP;
Masaaki Futamoto, Tsukui-gun, JP;
Yoshinori Miyamura, Nishitama-gun, JP;
Tokuho Takagaki, Yokohama, JP;
Hisashi Takano, Hachiouji, JP;
Fumio Kugiya, Hachiouji, JP;
Takeshi Nakao, Sagamihara, JP;
Kyo Akagi, Fuchu, JP;
Mikio Suzuki, Kokubunji, JP;
Hirotsugu Fukuoka, Hitachioota, JP;
Takayuki Munemoto, Niihari-gun, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428212 ; 428213 ; 4286 / ; 4286 / ; 428900 ;
Abstract
A magnetic recording medium, its fabrication method, and a magnetic recording apparatus in which both saturation induction and coercive force of a magnetic film is made high as they are near a surface of the recording medium. A high density information recording can be made higher than 50 kFCI in linear recording density even for spacing around 0.2 .mu.m.