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:
Nov. 10, 1987
Filed:
Sep. 23, 1985
Yasuyuki Hirabayashi, Chiba, JP;
Juro Sugiura, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An erasing head for magnetic recording medium by magnetizing said recording medium with a permanent magnet is improved by a ferrite head body having a slider plane wider than a track to be erased, and, a magnetic metal thin film covering said slider plane. Said magnetic thin film solves the problem caused by undesired natural magnetization of a permanent magnet, so as to improve the erase ratio and S/N ratio, and the use of slider plane wider than that of a track simplifies producing process of the head since no step is provided between the track to be erased and neighboring track, and no polishing process for smoothing said step is required.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile