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:
Jun. 16, 1992
Filed:
Nov. 29, 1990
Applicant:
Inventor:
Nobuhiro Kondo, Tokyo, JP;
Assignee:
Seikosha Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
346 742 ; 355251 ;
Abstract
A magnetic recording device includes a magnetic fluid having a surface, a body having a magnetic surface, an arrangement for forming a magnetic image on the magnetic surface, and an arrangement for moving the magnetic image with respect to the surface of the fluid, to attract the magnetic fluid thereto. A magnetic arrangement is provided to locally raise the surface of the fluid, i.e., to heap it up, so that the magnetic image only attracts magnetic fluid from the raised region thereof. The magnetic arrangement may be a permanent magnet or an electromagnet.